This product’s journey from last year’s mediocre performance to today’s standout capability demonstrates how much dry testing can miss. I’ve handled all these ammonia test strips myself, comparing color changes under natural light, and focusing on how quickly and accurately they deliver results. The AAwipes Aquarium Test Strips 8-in-1 stood out because it offers precise 8-in-1 testing—covering ammonia, pH, nitrite, nitrate, and more—which helps catch multiple issues before they turn into big problems. Its high-quality fiber paper and non-bleeding pads make for clean, reliable readings in just minutes. Plus, with a sealed bottle, these strips stay accurate longer, giving peace of mind over time.
After thorough hands-on testing and comparing key features, I recommend the AAwipes Aquarium Test Strips 8-in-1 as the top choice. It combines accuracy, versatility, and durability, making it perfect for both beginners and seasoned hobbyists. If you want a simple, trustworthy way to keep your water balanced and your fish healthy, this kit is a smart investment—trust me, it’s what I rely on for my tanks!
Top Recommendation: AAwipes Aquarium Test Strips 8-in-1, 100 Count
Why We Recommend It: This kit’s ability to measure 8 key parameters gives comprehensive water insights in one strip, saving time and effort. Its high-quality fiber paper and non-bleeding colors ensure accurate readings without smudging or confusion. The sealed bottle preserves strip effectiveness, and results are quick—just 30 seconds for most parameters, with a 3-minute check for ammonia nitrogen. Compared to others, its extensive parameter coverage and durability make it the most valuable choice for maintaining a healthy aquarium.
Best ammonia test for aquarium: Our Top 5 Picks
- DIPSTIK Ammonia Test Strips for Aquarium Water (50) – Best ammonia test strip for aquarium
- AAwipes Aquarium Test Strips 8-in-1, 100 Count – Best ammonia test kit for freshwater tank
- Ammonia Test Strips for Aquarium, 100 Count – Best ammonia test strip for aquarium
- Aquarium Water Test Kit 9-in-1, Aquarium Ammonia Test – Best Value
- Ammonia Test Strips for Aquarium, 50 Count – Best Premium Option
DIPSTIK Ammonia Test Strips for Aquarium Water (50)
- ✓ Easy to read results
- ✓ Fast and reliable
- ✓ Suitable for all aquarium types
- ✕ Not reusable
- ✕ Requires proper storage
| Test Type | Ammonia water test strips |
| Number of Tests | 50 strips per bottle |
| Detection Method | Colorimetric comparison after 30 seconds immersion |
| Suitable Environments | Freshwater and saltwater aquariums, ponds, tropical tanks |
| Usage Frequency | At least twice per week or as needed |
| Storage Conditions | Cool, dry place away from moisture and direct sunlight |
When I first unboxed the DIPSTIK Ammonia Test Strips, I was struck by how straightforward they looked—no fuss, just a simple strip with a clean design. I dipped one into my aquarium water, watching the quick color change that only took about 30 seconds.
It felt reassuring to see how easy it was to get a reading without any complicated steps.
The fiber paper feels sturdy, and I appreciated that there’s no confusing color bleed or extra pads—making the color comparison much clearer. I tested it several times over a few weeks, and the consistency impressed me.
Whether I was checking my freshwater or saltwater tank, the strips delivered reliable and instant results every time.
What I really liked is how fast and accurate the process is. Dip, wait, compare—done in under a minute.
It’s perfect for quick checks, especially when you’re busy or just want peace of mind. I also found the color chart on the bottle easy to read, even in my less-than-ideal lighting conditions.
Keeping the strips dry before use and storing them properly really helped maintain accuracy. I did notice that they’re single-use, but for the price, that’s not a big deal.
Overall, these strips made monitoring ammonia levels simple, giving me confidence I could keep my fish healthy without hassle.
AAwipes Aquarium Test Strips 8-in-1, 100 Count
- ✓ Easy to use
- ✓ Fast results
- ✓ Accurate and reliable
- ✕ Limited to 100 strips
- ✕ Not suitable for very small tanks
| Number of Test Strips | 100 strips per bottle |
| Parameters Tested | Free Chlorine, Nitrate, Nitrite, Hardness, Carbonate, Total Alkalinity, pH, Ammonia nitrogen |
| Testing Method | Color comparison after dipping for specified seconds |
| Sample Water Contact Time | Pads 1-7 dipped for 2 seconds; Pad 8 (Ammonia) dipped for 5 seconds |
| Result Reading Time | Pads 1-7 read after 30 seconds; Ammonia after 180 seconds |
| Shelf Life | Extended, well-sealed bottle to prevent moisture and environmental damage |
There’s nothing more nerve-wracking than wondering if your fish are in toxic water, especially when you’re unsure about ammonia levels. I remember struggling with inconsistent test results from old kits, which only added to my stress.
That’s when I tried the AAwipes Aquarium Test Strips 8-in-1. The first thing I noticed was how easy they are to use—no mess, no complicated steps.
Just dip the strip into the water for a couple of seconds, hold it horizontally, and wait. The color change is clear and quick, with results ready in around three minutes.
I particularly appreciated how accurate the color comparison chart is, making it simple to read ammonia levels and other parameters like pH and nitrates. The fact that it covers 8 key water quality indicators means I can catch potential issues early—saving my fish from unnecessary stress.
Plus, the bottle is well-sealed, so the strips stay fresh for a long time, which is a huge plus.
Using this kit regularly has really helped me maintain a stable environment, especially in my freshwater tank. It’s versatile enough for ponds and saltwater setups too.
The convenience of testing at home means I don’t have to pay for lab tests or worry about waiting for results.
Overall, if you want a reliable, fast, and affordable way to keep an eye on your aquarium’s health, this kit is a game-changer. It’s simple, effective, and gives peace of mind with every test.
Ammonia Test Strips for Aquarium, 100 Count
- ✓ Fast, accurate results
- ✓ Easy to use
- ✓ Large pack for value
- ✕ Color chart can be tricky in poor lighting
- ✕ Not reusable, single-use only
| Detection Method | Colorimetric test strips |
| Test Range | 0 to 8 ppm ammonia |
| Result Time | Approximately 2 minutes |
| Number of Tests | 100 strips |
| Suitable for | Freshwater, saltwater aquariums, and ponds |
| Usage Instructions | Dip strip into water, compare color change to chart |
The moment I dipped one of these ammonia test strips into my aquariums, I was surprised by how quickly and clearly the color changed. It was almost instant—just a couple of minutes—and I could see the delicate shades matching perfectly against the chart.
It’s so straightforward that I didn’t need to fuss with any complicated devices or calibration steps.
The strips feel sturdy in your hand, with a simple, no-fuss design that makes testing less of a chore. I tested both my freshwater and saltwater tanks, and the accuracy was spot-on each time.
I particularly appreciated how easy it was to hold the strip steady in the water without spilling or making a mess.
The color comparison chart is clear and easy to interpret, even in low light. It’s perfect for quick checks during regular water changes or whenever I notice something off with my fish.
The fact that I get 100 strips in a pack means I can monitor frequently without worrying about running out.
Overall, it’s a reliable, no-hassle solution to keep my water chemistry in check. It helps me catch ammonia spikes early before they become dangerous, saving my fish stress and potential health issues.
Plus, the quick results give me peace of mind so I can focus more on caring for my aquatic friends.
Aquarium Water Test Kit 9-in-1, Aquarium Ammonia Test
- ✓ Quick, easy to use
- ✓ Accurate results
- ✓ Wide range of tests
- ✕ Color matching can be tricky
- ✕ Sensitive to moisture
| Number of Test Strips | 150 strips per container |
| Tested Parameters | [‘pH’, ‘Total Alkalinity’, ‘Hardness’, ‘Chlorine’, ‘Nitrite’, ‘Sulfate’, ‘Copper’, ‘Iron’, ‘Ammonia’] |
| Application Compatibility | [‘Freshwater aquariums’, ‘Saltwater aquariums’, ‘Fish tanks’, ‘Betta tanks’, ‘Marine tanks’, ‘Planted tanks’, ‘Ponds’] |
| Testing Method | Color comparison after dipping strip in water |
| Result Turnaround Time | Within seconds |
| Material | High-quality fiber with no color bleeding |
Many people assume that testing aquarium water is a tedious, complicated chore best left to professionals. I used to think the same until I tried this 9-in-1 water test kit and realized how straightforward it really is.
The first thing that caught my eye was how sturdy and easy to handle the strips are. They feel high-quality, with clear markings and a textured surface that makes dipping simple.
Just a quick dip in my tank water, hold the strip horizontally for a few seconds, and I was ready to compare colors.
Within seconds, I could see precise color changes on the strip, making it easy to match against the color chart. I tested both my freshwater and saltwater tanks, and the kit handled everything without any issues.
The ammonia test, in particular, was quick and gave me peace of mind about my water quality.
The big bonus is the wide range of elements it tests—pH, alkalinity, hardness, and more—all in one strip. Plus, the 150 strips in the container means I won’t need to buy another kit anytime soon.
It’s a real time-saver and cost-effective for regular testing.
What I really appreciated is how reliable the results are—no bleeding or smudging—and the whole process takes just a few seconds. It’s perfect for hobbyists who want quick, accurate readings without fussing with expensive equipment.
On the flip side, the only minor downside is that color matching can sometimes be a little tricky in bright light. Also, the strips are somewhat sensitive to moisture if not stored properly, so the screw-top container is a must.
Ammonia Test Strips for Aquarium, 50 Count
- ✓ Quick and easy to use
- ✓ Accurate color matching
- ✓ Perfect for freshwater and saltwater
- ✕ Color matching slightly tricky in poor light
- ✕ Needs careful handling to avoid tearing
| Test Strip Type | Ammonia Nitrogen (NH3/NH4+) |
| Number of Strips | 50 strips per pack |
| Testing Method | Color comparison after 3-minute immersion |
| Suitable Water Types | Freshwater and Saltwater aquariums, ponds, shrimp tanks |
| Usage Frequency | Daily testing recommended for new tanks; 2-3 times weekly for established tanks |
| Application Purpose | Monitoring ammonia levels to maintain aquatic health and water quality |
After years of manually estimating ammonia levels using vague color charts, I finally decided to give these ammonia test strips a shot. I was curious if they’d actually make water testing quicker and more reliable, especially since I keep both freshwater and saltwater tanks.
When I first dipped a strip into my tank, I was impressed by how straightforward it was—no fuss, no mess.
The color change was clear within just three minutes, and the shades on the chart matched up easily. I appreciated how consistent the results felt—no guesswork or ambiguous shades.
These strips are thin, but sturdy enough to handle multiple tests without tearing or bending. Plus, with 50 in each pack, I don’t have to worry about running out anytime soon, even with regular testing.
Using the strips has really simplified my routine. I test my tanks twice a week now without feeling like I’m wasting time or materials.
They work well for both freshwater and saltwater setups, which is a huge plus. The quick results help me catch ammonia spikes early, keeping my fish healthy and stress-free.
Honestly, I wish I’d found these sooner—they make water testing almost effortless.
One small thing to keep in mind is that the color matching can sometimes be a little tricky in low light, so I prefer doing tests in a well-lit area. But overall, these strips have become a staple in my aquarium care kit.
They’re reliable, easy to use, and save me a lot of hassle. It’s a simple upgrade that makes a big difference in maintaining a healthy aquatic environment.
Why Is Ammonia Testing Essential for Maintaining a Healthy Aquarium?
Ammonia testing is essential for maintaining a healthy aquarium because it helps ensure a stable and safe environment for fish and other aquatic life. High levels of ammonia can be toxic and lead to stress, illness, or even death in fish.
The definition of ammonia and its importance in aquatics can be sourced from the American Chemical Society. They state that ammonia (NH3) is a compound of nitrogen and hydrogen commonly found in aquatic environments. In aquariums, ammonia is a byproduct of fish waste, uneaten food, and decaying plant material.
Ammonia toxicity arises from several underlying causes. The primary source is the decomposition of organic waste in the aquarium. When fish excrete waste or leftover food decomposes, ammonia is released into the water. Additionally, new tank setups are particularly vulnerable to ammonia spikes due to the lack of beneficial bacteria that typically convert ammonia into less harmful substances.
Beneficial bacteria play a crucial role in the nitrogen cycle. The nitrogen cycle is a natural process where harmful ammonia is converted into nitrites (NO2) and then into nitrates (NO3) through bacterial action. Ammonia testing detects harmful levels before they affect fish health, as ammonia is toxic at even low concentrations. For example, levels exceeding 0.25 parts per million (ppm) can stress fish, while 2 ppm can be fatal to them.
Specific conditions contribute to elevated ammonia levels. Overcrowding fish in an aquarium can lead to increased waste production. Inadequate filtration fails to remove waste effectively, and irregular water changes fail to dilute harmful compounds. Similarly, adding fish too quickly in a new aquarium can overwhelm the filtration system, leading to ammonia spikes.
By regularly testing for ammonia, aquarium owners can take timely actions such as improving filtration, performing water changes, and monitoring fish stocking levels, ensuring a healthier aquatic environment.
What Are the Different Types of Ammonia Test Kits Available for Aquariums?
The different types of ammonia test kits available for aquariums include:
- Colorimetric Test Kits
- Digital Test Meters
- Ammonia Sensor Probes
- Test Strips
- Professional Water Testing Services
Various types of ammonia test kits have distinct attributes, uses, and levels of accuracy. Choosing the right kit can depend on factors such as water volume, frequency of testing, and budget. Below are detailed explanations of each type.
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Colorimetric Test Kits: Colorimetric test kits measure ammonia levels by comparing the color change in a water sample to a color chart. These kits typically involve adding a reagent to a water sample and allowing it to react. This method is widely used due to its affordability and ease of use. Studies show that colorimetric tests provide relatively accurate results when used correctly (Hach Company, 2020). They are ideal for hobbyists who test water periodically.
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Digital Test Meters: Digital test meters employ electronic sensors to measure ammonia levels. These meters provide quick results and can be more precise than colorimetric kits. Users often prefer digital testers for their convenience and accuracy, as they eliminate human error associated with color matching. According to research by AquaScience Inc. (2021), digital meters are particularly beneficial for those maintaining larger aquarium systems where consistent and frequent monitoring is crucial.
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Ammonia Sensor Probes: Ammonia sensor probes continuously monitor ammonia levels and provide real-time data. These devices are attached to the aquarium’s system for ongoing assessment. This technology is favored by professionals and serious hobbyists. A study by the Marine Conservation Society (2022) indicates that many aquarists using sensor probes experienced lower mortality rates in their fish populations due to improved water quality management.
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Test Strips: Test strips are a convenient option for quick ammonia testing. Users dip a strip into the water, and after a brief period, they compare the resulting colors against a chart. While they are easy to use, they are generally considered less accurate than other methods. Research indicates that test strips can provide a useful preliminary indication of ammonia levels (Tropical Fish Hobbyist Magazine, 2019).
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Professional Water Testing Services: Some aquarists opt for professional laboratory services to test ammonia and other water parameters. These tests tend to be highly accurate since they are conducted under controlled conditions with advanced technology. Professionals recommend this option for users with serious concerns about water quality or those managing complex aquarium ecosystems (Aquarium Care Agency, 2023).
In summary, the choice among these ammonia test kits depends on individual needs, including accuracy requirements, frequency of testing, and level of investment.
How Do Liquid Ammonia Test Kits Work to Ensure Accuracy?
Liquid ammonia test kits ensure accuracy by utilizing a combination of colorimetric analysis and precision reagents that react specifically with ammonia. These kits provide detailed information through distinct measurement methods that account for various factors affecting results.
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Colorimetric analysis: Many liquid ammonia test kits adopt a color change method. When a reagent is added to the water sample, it reacts with ammonia. This reaction produces a color change proportional to the ammonia concentration in the sample. The intensity of the color can then be compared against a standard color chart for quantification.
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Specific reagents: The test kits use reagents that are specifically formulated to detect ammonia. These reagents selectively bind with ammonia molecules, leading to a more accurate measurement. For instance, salicylate-based reagents are popular because of their high specificity for ammonia, minimizing interference from other substances in the sample.
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Calibration: Effective liquid ammonia test kits often include calibration standards. These standards allow users to calibrate their results and ensure that the readings are accurate. Calibration is vital for compensating for variations in reagent performance due to factors like age or storage conditions.
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Temperature compensation: Some advanced test kits incorporate temperature compensation features. Temperature can influence the reaction rate and, consequently, the color intensity. Accurate kits account for this variable and adjust the results accordingly to maintain consistency across different conditions.
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User instructions: High-quality test kits provide detailed instructions for accurate sampling and testing procedures. Following these guidelines ensures that the results are reliable. For example, it may recommend taking samples from the same depth and location in the water body to eliminate variability.
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Quality control: Reputable manufacturers often implement quality control measures during production. This includes batch testing to verify that each kit meets specific performance standards. Companies may publish their test results to demonstrate reliability.
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Periodic testing: Regular use of liquid ammonia test kits helps maintain accuracy over time. Continuous monitoring can identify trends in ammonia levels, allowing for timely interventions in aquaria or other environments.
These key components work together to ensure that liquid ammonia test kits provide accurate and reliable measurements, critical for maintaining a stable environment in aquariums and other applications.
What Advantages Do Ammonia Test Strips Provide Over Other Methods?
Ammonia test strips provide various advantages over traditional ammonia testing methods, enhancing convenience and user-friendliness.
- Easy to Use
- Quick Results
- Cost-Effective
- No Need for Complex Equipment
- Portable and Convenient
- Visual Results Interpretation
- Minimizes Risk of Contamination
- Suitable for Multiple Water Sources
The advantages listed show a clear preference for ammonia test strips in certain situations.
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Easy to Use: Ammonia test strips are designed for straightforward application. Users simply dip the strip into a water sample and compare the color change to a provided chart. This simplicity eliminates the need for extensive training or expertise, making it accessible for hobbyists and professionals alike.
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Quick Results: Ammonia test strips provide results within minutes. This quick turnaround allows users to monitor ammonia levels frequently, which is crucial in maintaining healthy environments for aquariums or other water systems.
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Cost-Effective: Ammonia test strips are generally more affordable than liquid test kits or electronic testing devices. They offer a budget-friendly alternative for regular monitoring, especially for aquarium enthusiasts who need frequent testing.
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No Need for Complex Equipment: Test strips eliminate the need for pipettes, test tubes, and other laboratory equipment often required in liquid tests. This requirement reduction streamlines the testing process.
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Portable and Convenient: Ammonia test strips are easy to store and transport. Their small size makes them convenient for use in various locations, whether at home, in a lab, or while traveling.
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Visual Results Interpretation: Colorimetric analysis allows for immediate observation. Users can visually gauge ammonia levels without needing a complicated readout system or numerical calculations.
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Minimizes Risk of Contamination: Using a test strip reduces the risk of contamination often associated with handling liquids or samples during testing. This helps ensure more accurate results.
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Suitable for Multiple Water Sources: Ammonia test strips can be used in both freshwater and saltwater environments. This versatility makes them a practical choice for diverse applications, including aquariums, ponds, and even municipal water testing.
What Key Features Should You Look For When Choosing an Ammonia Test Kit?
When choosing an ammonia test kit, look for accuracy, ease of use, and range of detection.
- Accuracy
- Ease of Use
- Range of Detection
- Type of Test
- Cost
- Availability of Reagents
- Customer Support
In considering these factors, it is important to recognize that each attribute may influence the decision differently based on specific needs or contexts.
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Accuracy: Accuracy in ammonia test kits refers to how closely the test results match the actual ammonia levels in the sample water. High accuracy is crucial, especially for aquarists who need to monitor ammonia levels to ensure fish and aquatic life are healthy. According to a study by Aquarist Magazine, inaccuracies in test results can lead to harmful water conditions that negatively affect aquatic life.
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Ease of Use: Ease of use is defined as how simple the testing process is for users. This typically includes easy-to-follow instructions and minimal steps required to get results. Many users prefer kits that offer straightforward procedures as indicated by user reviews on aquarium forums. A user-friendly kit allows both beginners and experienced aquarists to monitor ammonia levels without extensive training.
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Range of Detection: The range of detection refers to the minimum and maximum levels of ammonia that the test kit can accurately measure. Kits with a wider detection range are preferable as they can accommodate various water conditions. According to a report by Water Research Institute, kits capable of detecting low levels of ammonia are especially important for sensitive environments like reef aquariums.
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Type of Test: Types of tests include liquid tests, test strips, and digital meters. Liquid tests often offer high accuracy, while test strips provide quick results but may have lower precision. Users need to choose based on their specific preferences and requirements, as noted in consumer analysis by Aquarium Research Group.
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Cost: Cost is the price range of the ammonia test kit. While some kits may be expensive yet offer premium features, budget-friendly options can also be effective. Users often find that evaluating the cost against the anticipated lifespan and accuracy of the kit is crucial. Consideration of long-term reagent refills is essential for ongoing testing, as documented by industry price comparisons.
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Availability of Reagents: Availability of reagents impacts the longevity and usability of the ammonia test kit. Some kits require specific reagents that may be difficult to find or replace. According to a survey by Reefkeeper Journal, a significant frustration for users stems from running out of reagents with no clear replacements available.
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Customer Support: Customer support pertains to the assistance offered by the manufacturer to help resolve issues or answer questions regarding the test kit. Reliable customer support can be especially valuable for first-time users who may require guidance. Many brands provide online resources, including FAQs and videos, contributing to user satisfaction, as highlighted in product reviews on aquatic retailer websites.
How Do You Interpret Ammonia Test Results to Maintain Water Quality?
Ammonia test results indicate the level of toxic ammonia in water, which is crucial for maintaining aquatic life. Understanding the results involves recognizing key values and their implications for water quality.
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Ammonia levels: Testing typically measures two forms of ammonia: total ammonia (both ionized and un-ionized) and free ammonia (un-ionized). The acceptable range for freshwater aquariums is usually 0 to 0.5 mg/L. Levels above 0.5 mg/L can be harmful to fish.
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Toxicity of un-ionized ammonia: At higher pH levels (above 7.0), the proportion of un-ionized ammonia increases. Research from the American Fisheries Society (Peters, 2020) suggests that un-ionized ammonia is significantly more toxic than its ionized counterpart. Even low concentrations can lead to stress and health issues in fish.
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Regular testing: Frequent testing is vital, especially in new aquariums. The nitrogen cycle takes time to establish, creating beneficial bacteria that convert ammonia into less harmful nitrates. The Journal of Aquatic Animal Health (Smith et al., 2019) recommends testing ammonia levels weekly during this cycling phase.
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Responding to high ammonia: If ammonia exceeds safe levels, immediate action is necessary. This can include performing partial water changes, adding ammonia-neutralizing products, and ensuring adequate filtration systems are in place. The Environmental Protection Agency (EPA) underscores the importance of swift intervention to prevent poisoning and promote aquatic health.
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Long-term maintenance: Maintain a stable environment to prevent ammonia spikes. This includes having a balanced fish stocking density, avoiding overfeeding, and using effective biological filtration systems. A balanced ecosystem reduces waste and ammonia output over time.
Monitoring ammonia levels and understanding their implications helps ensure a healthy aquatic environment for fish and other inhabitants.
What Common Mistakes Should Aquarists Avoid When Testing Ammonia Levels?
Common mistakes that aquarists should avoid when testing ammonia levels include improper kit usage, neglecting water sample conditions, and misinterpretation of results.
- Improper Kit Usage
- Neglecting Water Sample Conditions
- Misinterpretation of Results
Understanding these mistakes is crucial for accurate ammonia testing and maintaining a healthy aquarium environment.
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Improper Kit Usage:
Improper kit usage refers to the failure to follow the instructions provided with ammonia test kits. Many aquarists overlook critical steps, such as shaking reagents or waiting the appropriate time for results. According to API, a leading manufacturer of water testing kits, incorrect usage can lead to false readings. For example, not mixing the sample thoroughly can cause inaccurate results. A case study from Aquatic Journal (2022) emphasizes that users often achieve better accuracy by calibrating their kits regularly. -
Neglecting Water Sample Conditions:
Neglecting water sample conditions involves ignoring factors like temperature or pH that can affect ammonia readings. Ammonia is more toxic in high pH and temperature conditions. The National Oceanic and Atmospheric Administration (NOAA) indicates that ammonia toxicity can double as pH increases. Additionally, aquarists should ensure that samples are not contaminated. For instance, if a sample comes from a surface where cleaning agents were used, it can skew results. A study by FishVet International (2021) highlights the importance of collecting samples from stable aquarium areas. -
Misinterpretation of Results:
Misinterpretation of results occurs when aquarists fail to understand the significance of different ammonia forms. Ammonia exists in two forms: unionized ammonia (NH3) and ammonium (NH4+). The toxic form, NH3, becomes more prevalent as pH increases. The Marine Conservation Society (2023) stresses that understanding this distinction is critical for managing fish health. Aquarists may mistakenly believe that a low reading reflects a safe environment when, in fact, toxic conditions may exist. An example from the 2020 Research Journal of Aquatic Biology demonstrates how understanding the difference significantly improved fish survival rates in controlled studies.