Method for improving current-year small-specification fingerling overwintering survival rate of fugu obscurus

Abstract

A method for improving the current-year small-specification fingerling overwintering survival rate of fugu obscurus is composed of four production steps which are small-specification fingerling concentrated breeding, temporary culture adaptation, forced domestication and reinforced cultivation. The method is characterized by comprising the steps of placing small-specification thin fingerlings which are yellow in body color in the current year in an indoor cement pool in a concentrated mode ahead of time in the last ten days of October prior to grinding wheel when the water temperature is 20 DEG C, feeding fresh and live opossum shrimp or exopalaemon carinicauda during an adaptation period of 2-3 days for the small-specification fingerlings just subjected to concentrated breeding, starting forced domestication with matched feed after stopping feeding the fresh and live baits for 2-3 days, continuing the domestication for 7-10 days, feeding twice per day during the reinforced cultivation period, sucking the bottom to discharge dirt per day with the feeding for 2 hours as the standard, keeping water quality fresh, adopting circulating water or replacing the water twice per week, replacing 2 / 3 of water each time, maintaining the water temperature at over 15 DEG C, and adopting a fugu obscurus conventional method to overwinter after continuing the reinforced cultivation for 18-22 days.

Description

technical field [0001] The invention relates to aquaculture, in particular to a method for surviving the winter of puffer puffer with small size in that year. Background technique [0002] Fugu obscurus ( Takifugu obscurus ) is an important fishery resource in the Yangtze River waters of my country, and has high nutritional and medicinal value. Its muscles are as white as frost, the meat tastes plump, tender and delicious, rich in protein and rich in nutrition, and is known as the first of the "three delicacies of the Yangtze River". Our country has had the traditional habit of eating puffer fish since ancient times. Puffer fish has always been regarded as a treasure on the table, and the liver and ovary of puffer fish can extract tetrodotoxin, which can be used to treat neuralgia, spasm, nocturia, etc. Therefore, Puffer obscurus has high economic value and medicinal value. Puffer obscurus is the main species of puffer fish cultured in my country. Its breeding output is t...

AI Technical Summary

Problems solved by technology

[0003] At present, the breeding technology of fugu obscurus larvae and summer flower fingerlings is relatively mature, and the survival rate is relatively high. The speed of feed is inconsistent. Some fish species change food early, and these fish will grow rapidly, resulting in particularly large individuals. When feeding, these large fish will occupy the feeding area, making it difficult for fish species that have not changed food. Close to the baiting area, to deal with this problem, the common practice is to pull the net every once in a while to select the large individuals and separate them for grading. After several times of grading, when autumn comes, 80-90% of the fish species can However, there are always 10-15% fish species that have not changed their diets. They rely on aquatic organisms in the water to maintain their lives. After a breeding cycle in the pond, fish that have not changed their diets tend to be small and small with a total length of 5-5. 7cm, yellow body color, commonly known as "yellow-headed seedlings" and "old-headed seedlings"; these fish species have a very low survival rate in the next overwintering process because they do not accumulate enough nutrients in their bodies, generally around 30-40%, and some even lower