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Biological characteristics
(1) Morphological characteristics. The herring body is flat on the side, the back is raised, the mouth is large, and the jaw is slightly protruding. The upper and lower jaws, the vomer and the skull have different sizes of sharp teeth. The posterior edge of the front humerus is jagged, with 4 to 5 dentate spines at the lower edge and l-2 flattened spines at the posterior edge of the posterior tibial shaft. The scales are small round scales, dorsal fins long, divided into two parts, the front has 11 hard spines. Pectoral fins round, pelvic fins near the chest, tail fins are also round. Colour brown. Yellow and white belly. The body side has irregular dark brown patches and spots. There is a narrow brown stripe from the snout through the eye to the base of the dorsal fin. There is a wide dark brown band below the sixth to seventh spines of the dorsal fins. There are brown spots on the dorsal, caudal, and anal fins.
(2) Living habits. Carp likes to inhabit calm water or micro-flowing water, and especially likes to live in lush lakes and rivers. The optimum temperature for life is 7 to 32°C, and the optimum temperature is 18 to 25°C. When the water temperature is lower than 7°C, the activity is sluggish and it infiltrates into the deepwater layer to overwinter. When water temperature rises above 7°C in the spring, it starts to feed in the water grass. During the day, it is usually lying on the bottom of the water and is less active. Night activities are frequent, and food is found outside. In the optimum temperature range, the growth rate increases as the water temperature rises; however, the water temperature is higher than 32°C and the appetite diminishes and grows slowly.
(3) diet and growth. Carp is benthic fierce fish, extremely gluttonous, mainly prey on small fish, shrimp. Freshly hatched larvae can prey on other young fish. After 20 centimeters in length, they feed mainly on small fish and shrimps. When they are 25 centimeters or more, they feed on oysters and squid, and 31 centimeters in length can be devoured. 15 centimeters in length. In the case of extreme hunger, one can even eat the same kind.
Carp grows faster, under conditions of sufficient feed. 1 Up to 300 to 800 grams of winter-aged individuals, and 2 winter-aged individuals can weigh more than 900 grams. The growth of body length and body weight of females older than 1 year were significantly faster than that of males. The body length and body weight of 2 to 3 years old were in a vigorous growth period, and the growth rate was slower after 4 years of age. In natural waters, the largest individual can reach 7.5 kg.
(4) Breeding habits. Carp matured earlier, males were sexually mature, sexual maturity was 15.6 cm and body weight was 78 g. Mature females are 2nd instar, and the smallest individuals are 21cm in body length, 160-250g in body weight, 20g in gonads, and 30,000-200,000 in fecundity.
The natural breeding season of carp is from mid-May to early August and from June to July it is a prosperous period during which the broodstock clusters at the lake entrance with a certain flow rate, spawning activities are mostly carried out at night. The eggs of salmon are semi-floating and contain large oil balls. They sink in still water and appear semi-floating in flowing water. The diameter of eggs is 1.2-1.4 mm. Fertilized eggs suitable incubation temperature 20 ~ 32 °C, the most suitable 25 ~ 30 °C. At a water temperature of 21 to 24°C, fertilized eggs hatch for a longer period of time and require 3 days. When juveniles have a total length of 1.65 cm, they have a fine-colored appearance, but the scales are not yet complete.
About the biological characteristics of salmon
The squid is also known as osmanthus fish and seasonal flower fish. It is taxonomically related to the genus Acridus, fish, and genus. Due to its delicate meat, delicious taste, and high protein content, eel is a rare aquatic product and is highly favored by consumers.