Fish Behavior

Fishermen usually avoid fishing during storms for safety. Storms decrease visibility and create hazardous conditions. However, many anglers find fishing improves 24-48 hours after a storm as fish become more active. Local knowledge and weather radar help fishermen assess fishing conditions and ensure safety when they plan their trips. However, safety is paramount. Fishermen must … Read more

Fish without an operculum, like elasmobranch fishes (sharks and rays), have exposed gills. They use ram ventilation to draw water over their gills for breathing. Bony fishes, on the other hand, possess an operculum that covers and protects their gills. Without this structure, fish may face challenges in water intake for respiration. In these fish, … Read more

Fish with jaws, including bony and cartilaginous fish, have gills and scales. Gills help them breathe by extracting oxygen from water. Scales protect their bodies and reduce drag while swimming. Jaws evolved from gill structures, allowing better feeding. Jaws, gills, and scales are essential features of these aquatic vertebrates. In addition to gills, jawed fish … Read more

Fish excrete ammonia mainly through their gills. They use water flowing over the gills to quickly remove this toxic waste. This method is energy-efficient for marine fish. As they metabolize food, they convert waste into ammonia. Unlike mammals, fish do not urinate; their gills manage the excretion of nitrogenous waste. Gills serve as the primary … Read more

Fish use unidirectional flow for respiration, enabling efficient oxygen extraction through their gills. Water moves in through the mouth and exits via gill slits, maximizing gas exchange. This physiological adaptation helps fish thrive in water, where oxygen levels are much lower than in air. The design of fish gills supports this unidirectional flow. Each gill … Read more

Many fish use fins for defense. Spiny dorsal fins and venomous spines, like the lionfish’s, deter predators. Pectoral fins help with balance, making fish appear larger. Pelvic fins maintain stability. Overall, fins serve multiple purposes, including capturing prey and establishing territorial behavior. Certain species, such as lionfish and stonefish, have evolved venomous spines in their … Read more

Baleen whales (Mysticeti) use baleen plates to filter feed. They open their mouths underwater and take in seawater. As the water flows out, the baleen traps small organisms like krill and fish. This efficient feeding method allows baleen whales to consume food while swimming, which is different from how fish eat their prey. Various filter-feeding … Read more

Yes, fish can use anaerobic respiration when oxygen is low. This process does not need oxygen and produces less energy than aerobic respiration. Most fish rely on aerobic respiration but switch to anaerobic methods, especially during hypoxia. Cyprinids, for example, use carbohydrates and amino acids under these conditions. During anaerobic respiration, fish produce energy from … Read more

Fish primarily use aerobic respiration to generate energy. They rely on glucose and fatty acids as fuel. Fish extract dissolved oxygen from water through their gills. Although they mainly depend on aerobic metabolism, they can switch to anaerobic pathways during heavy exercise. Adequate oxygen levels are essential for meeting their energy requirements. The oxygen needs … Read more

Fish urinate mainly through gills and a urinary pore. Freshwater fish release excess water through special gill cells. Ocean fish make less urine due to saltwater. They also excrete some nitrogen waste through their skin or digestive tract. These processes are vital for fish physiology and kidney function in maintaining balance. Fish also possess kidneys, … Read more