Sea lampreys are a type of fish that came from the Atlantic Ocean. They invaded the Great Lakes through canals in the 20th century. They were first seen in Lake Erie in 1921, then in Lake Michigan in 1936, Lake Huron in 1937, and Lake Superior in 1938. This invasion has a major ecological impact … Read more

Lakes become populated with fish through different methods. Humans often introduce fish into isolated lakes. Some lakes also connect to other water sources through underground streams or hidden vegetation. These natural connections allow fish to migrate, supporting ecological balance and increasing biodiversity in the lake ecosystem. Human involvement also plays a crucial role. People introduce … Read more

Freshwater fish are caught for aquariums using small nets by collectors focused on fish health. They release by-catch immediately to keep those fish alive. Unlike commercial fishing, which can harm fish, aquarium collectors prioritize keeping every fish in good condition for aquarium enthusiasts. Traps also play a vital role in catching freshwater fish. Fishermen bait … Read more

Fish eggs are mainly transported by birds, especially waterfowl. Many fish produce sticky eggs that cling to aquatic plants. As waterfowl move through these habitats, they accidentally gather and transfer the eggs to new ponds. This process helps in the natural dispersal of fish eggs and supports the aquatic ecosystem. Birds also play a vital … Read more

Fish eggs are harvested by removing the roe sacks right after killing the fish. This method prevents harmful post-mortem chemicals from affecting the eggs. After cleaning the roe, the fish is processed for meat, skin, and other useful by-products. This approach ensures that minimal waste occurs during the harvesting process. Caviar, a delicacy derived from … Read more

Fish eggs are fertilized on a fish farm by collecting eggs and sperm in a common trough. Water is added to start the fertilization process. Then, excess sperm, ovarian fluid, and blood are rinsed away. Finally, the fertilized eggs are transferred to an incubator tray for development. Another technique used is semi-natural fertilization. In this … Read more

Both fish and amphibians reproduce through external fertilization. The female lays eggs in water, while the male releases sperm over them. This allows fertilization to happen outside the body. The aquatic environment supports the development of embryos, which is vital for both groups. Both groups lay eggs that require moisture for development. Fish eggs are … Read more

Fish adapt to living in saltwater by using osmoregulation. This process helps them manage salt intake and avoid dehydration. Marine fish excrete extra salt through special cells. Their kidneys play a key role by retaining water. These adaptations support homeostasis and keep body fluids balanced in a salty environment. Another adaptation is to their body … Read more

The embryonic shield in fish sets the dorsal-ventral axis. Transparent zebrafish embryos develop outside the body, allowing us to see blood circulation. Nutrient levels and egg yolk composition support embryo growth. This research enhances our understanding of reproduction and improves fish production techniques. Additionally, environmental factors play a significant role in embryo growth. Temperature, water … Read more

Deep-sea fish are caught using several methods like trolling, chumming, popping, and jigging. Trolling drags bait behind a moving boat. Chumming uses bait to attract fish. Popping and jigging involve specific lures to entice fish. Many fishing guides teach these techniques during fishing excursions, helping anglers improve their skills. In addition to these techniques, using … Read more