Fish Behavior

Deep-sea fish live in high-pressure environments by not having a swim bladder, which is a gas-filled organ in surface fish. They rely on body fluids and chemical adaptations to balance pressure inside and outside their bodies. These fish also possess specialized sensory organs to navigate the dark ocean. In addition, deep-sea fish possess specialized adaptations … Read more

Fish live under ice by slowing their metabolism. Being cold-blooded, they adjust to lower temperatures. Species like the golden carp can thrive in frozen lakes. They prefer deeper regions or thermoclines, where warmer water lies. Ice creates a stable habitat, allowing fish to rest until temperatures rise again. Beneath the ice, water remains liquid due … Read more

Saltwater fish live by drinking seawater and removing excess salt through their gills and kidneys. This adaptation helps them keep a balanced level of fluids and essential salts. Unlike freshwater fish, saltwater species like salmon and bull sharks manage hydration effectively in their saline environment for survival and health. Furthermore, saltwater fish have evolved various … Read more

Fish live in frozen lakes by staying in deeper water. The ice on top insulates the water below. As cold-blooded animals, fish adapt to the lower temperatures. Their metabolism slows down, helping them survive longer without food while oxygen stays trapped under the ice. This allows them to rest through winter and maintain fish survival. … Read more

Deep-sea fish survive in the ocean’s depths by balancing internal pressure with external pressure. They use trimethylamine N-oxide (TMAO) to stabilize cells under high pressure. These fish thrive in low-oxygen environments and have adaptations like unsaturated fatty acids to help them find food and endure extreme conditions. Fish at the bottom of the ocean utilize … Read more

Fish raise carbon dioxide levels in lakes through respiration and the decomposition of organic matter. Freshwater fish, like goldfish, can produce 70-170 mg of CO₂ each day. This rise in CO₂ levels can lower pH levels, which impacts aquatic ecosystems, including fish respiration and oxygen availability. The constant cycling of carbon dioxide impacts freshwater ecosystems … Read more

Salmon are anadromous fish. They hatch in freshwater and then migrate to seawater. This transition involves osmosis. In saltwater, they take in water and remove excess salts through their gills and kidneys. Hormones help regulate these changes, allowing salmon to adapt to different salt levels throughout their life. When fish move to seawater, they face … Read more

Fish get worms by eating infected intermediate hosts, like crustaceans or smaller fish. Common parasites are nematodes and flatworms. When infected fish are eaten, larvae hatch in the stomach. Warmer waters can lead to more parasites in fish. Cooking fish thoroughly can kill these parasites and prevent infections. Another common parasite is the tapeworm, which … Read more

Fish reach Lake Eyre through inland rivers that flood, transporting viable fish eggs and adult fish. These native species, adapted to high salinity, breed in temporary water bodies when conditions are right. Flooding prompts them to migrate south to the lake, forming an oasis that attracts migratory birds and supports the ecosystem. Fish such as … Read more

Fish get stuck in ice when they die, causing their bodies to float and freeze. Ice creates an insulating layer on the surface of the lake. Fish can survive beneath this ice, as liquid water and oxygen are available. Cold temperatures lower their metabolism, allowing them to remain inactive until spring. Fish adapt to frozen … Read more