Freshwater fish take in excess water from their environment via osmosis. They manage this by excreting the extra water through their kidneys as urine. Unlike saltwater fish, which drink large amounts of water, freshwater fish maintain salt and fluid balance through effective osmoregulation to achieve homeostasis in their environment. Firstly, they have specialized cells in … Read more

Freshwater fish do swell in saltwater. In saltwater, they lose water via osmosis. This process makes their cells shrivel. It can lead to dehydration and serious health issues like bloat or cell rupture. Conversely, saltwater fish cannot survive in freshwater due to excess water intake, which causes their cells to swell. In saltwater, the external … Read more

Yes, freshwater fish do suffer when dying. Scientific studies show they feel pain, especially during commercial fishing and asphyxiation. Symptoms of distress include gill collapse. Humane treatment involves using anesthetics for euthanasia. Toxic water can worsen their suffering, causing organ failure and higher bacteria levels. Humane care methods are essential during this time. Providing a … Read more

Freshwater fish do rest, but their sleep differs from mammals. Most are diurnal, active during the day and resting at night, while some are nocturnal. During rest, fish reduce swimming activity and may hover in place. They lack eyelids, so their resting state looks different from sleep in land animals. The degree of sleep varies … Read more

Freshwater fish replace salts lost through diffusion. They use their gills to actively absorb salts from the water. At the same time, they excrete excess water to maintain electrolyte balance. This process, called osmoregulation, helps them achieve homeostasis and stabilize their body fluids in a hypertonic environment. Firstly, these fish actively absorb sodium and chloride … Read more

Yes, freshwater fish do pee. They release a lot of urine to get rid of excess water they take in from their surroundings. Their kidneys filter waste, creating urine with ammonia and urea. This process helps balance water levels and supports aquatic ecosystems by recycling nutrients within the water. Fish urine also contributes to aquatic … Read more

Freshwater fish do not need to drink large amounts of water. Their bodies have higher salt content than their environment, so they absorb water through their skin and gills using osmosis. They also take in some water while eating. Excess water is expelled through urination, helping them maintain their internal balance. Additionally, these fish have … Read more

Freshwater fish usually do not need added salt. Most fish species live in low-salt water and use their kidneys for osmoregulation. However, species like livebearers can benefit from aquarium salt for immune support and health. Use salt carefully to avoid harming sensitive fish and affecting water chemistry. The proper application of salt involves gradual introduction … Read more

Freshwater fish need oxygen to survive. Ideal dissolved oxygen (DO) levels are between 6-8 mg/L. Fish absorb oxygen from the water, supporting their metabolic processes. Low DO can harm fish. A good filtration system helps maintain oxygen saturation. Use a dechlorinator to protect aquatic plants and ensure a healthy aquarium environment. Aeration plays a critical … Read more

Freshwater fish like trout and carp contain omega-3 fatty acids that support heart health and brain function. However, marine fish such as salmon offer higher amounts of omega-3s. The American Heart Association recommends eating two servings of fatty fish each week to fully enjoy the health benefits of omega-3s. However, some freshwater fish may contain … Read more