Fish Physiology Notes ((free)) -

They retain and trimethylamine oxide (TMAO) in their blood to make their internal osmotic concentration slightly higher than seawater. This prevents water loss and reduces the need to drink much seawater. TMAO also stabilizes proteins against high pressure and urea damage.

Some fish, particularly sharks (via the Ampullae of Lorenzini), can detect the weak electrical fields generated by the muscle contractions of other living beings. 6. Digestion and Metabolism Fish metabolism is highly dependent on water temperature.

Some fish have evolved accessory organs: Fish Physiology Notes

If you are looking for for academic study or personal interest, this guide covers the core biological systems that allow fish to survive and excel underwater. 1. Respiration: The Gills and Beyond

Most fish are ectothermic (cold-blooded), meaning their body temperature matches their environment. However, some "regional endotherms" (like Great White Sharks) can keep certain muscles warmer than the water using a specialized heat-exchange system called the rete mirabile . 4. Buoyancy and the Swim Bladder They retain and trimethylamine oxide (TMAO) in their

Fish are primarily (excrete ammonia as the main nitrogenous waste).

Description and Physical Characteristics of Fish - All Other Pets Some fish, particularly sharks (via the Ampullae of

provides an excellent breakdown of the major fish groups, including jawless, cartilaginous, and bony fishes.

The primary challenge for fish is extracting oxygen from water, which contains much less oxygen than air.

: Physiological studies often measure heart rate and oxygen consumption to determine how fish respond to environmental stressors like temperature changes. 3. Buoyancy and Movement

The gill is the primary site of gas exchange in most fish. It is a highly efficient counter-current exchanger.