Fish have a stomach. The digestive system of fish consists of digestive tract and digestive glands. The digestive tract has gastrointestinal differentiation and obvious pancreas. Fish live in water all their lives, so their digestive organs and feeding habits are adapted to life in water.
The mouth is located between the upper jaw and the lower jaw, and there is no salivary gland in the mouth. There are real teeth in the oropharyngeal cavity of fish, which can actively ingest and prey, which is more advanced than that of Cirrhostoma. The teeth on the jaw of Cladosporidae are transformed from peltate scales, and the teeth of teleost are divided into oral teeth and throat teeth due to different sites.
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Extended information
Fish species:
1. Fragrant fish
Fragrant fish has a long and narrow body with a flat side, a small head with a pointed snout and a small mouth and big eyes. The back edge is dark, and the sides and abdomen are white. The tail is forked, without hard spines, and there is a small fat fin behind the dorsal fin. When fresh, the fins are light yellow, and there is a yellow spot above the ventral fin.
2, Tangyu
Tangyu (scientific name: Tanichthysalbonubes). It belongs to the genus CYPRINIDAE, with only one species, distributed in the Pearl River Delta region of Guangdong. Tangut fish is an endemic species in China and a national second-class protected wild animal. However, due to its narrow distribution and sparse population, it has now become extinct in the wild.
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