A fish is an aquatic, anamniotic, gill-bearing vertebrate animal with a tough cranium to protect the brain, but lacking limbs with digits.
Fish Tank. Aquatic Life. Freshwater Shrimp.Examining the Hearing and Behavior of Your Fish. You can examine the fishs hearing ability through several tests. Here are some such tests.

Such details provide a deeper understanding and appreciation for Aquatic Fish Behavior.
Freshwater fish gather among submerged logs, aquatic vegetation, rocky outcrops, and drop-offs for protection from predators and currents, according to the Victorian Fisheries Authority.

These fish evolved in habitats containing aquatic vegetation and display behaviors compatible with planted environments.

Oxidative stress biomarkers and aggressive behaviour in fish exposed to aquatic cadmium concentration. Neotrop. Ic thylerl. 7(1): 223-239.