The limit temperature of rainbow trout is 0 ~ 30℃, the suitable living temperature is 12 ~ 18℃, and the optimum growth temperature is 16 ~ 18℃. When the temperature is lower than 7℃ or higher than 20℃, the appetite decreases and the growth slows down. When the temperature is higher than 24℃, the feeding stops and then gradually weakens and dies.
2. Sturgeon
Sturgeon inhabits the middle and lower water. The migratory species of Haihe River and the settled species of the river move to the upper reaches of the river during spawning period. In winter, it is mostly in rivers or near-shore deep waters. Larvae usually feed on plankton. In the larval stage, benthic aquatic oligochaeta, aquatic insects, small fish, shrimp and molluscs are the main foods. In the adult stage, it feeds on zoobenthos or animal and plant dregs, while the shovel sturgeon still feeds on plankton.
3. Yayu
Ya 'an fish is a rare cold-water fish growing in Ya 'an. It looks like carp, and its scales are as thin as trout. It tastes tender and nutritious, and it is a tribute of past dynasties.
4. Hucho taimen
Hucho taiwanensis likes to live in cold water with clear water quality (the highest water temperature does not exceed 20℃), which is mainly distributed in some mountainous waters with good forest vegetation protection. In the northern region, after the ice and snow melted from late April to early May, hucho taimen swam upstream to the tributaries of rivers to feed and grow, and lay eggs and reproduce.
5.pike with white spots
Although it is distributed in the cold zone, the white-spotted pike belongs to sub-cold water fish, with relatively wide adaptation temperature and strong adaptability. The adaptive temperature range is 0 ~ 30℃, and it can still survive at 35℃, and the optimum feeding temperature is 16 ~ 26℃. According to the research results in Gansu, the optimum growth temperature is 23℃ ~ 24℃.
Baidu encyclopedia-cold water fish
Baidu encyclopedia-white spotted pike
Baidu encyclopedia-Zheluo Yutai gate
Baidu Encyclopedia-Yayu
Baidu encyclopedia-sturgeon
Baidu encyclopedia-rainbow trout