Large-scale fingerling production technique for takifugu obscurus in brackish water

Abstract

Disclosed is a large-scale fingerling production technique for takifugu obscurus in brackish water. The technique is characterized in that newly hatched takifugu obscurus larvae are transferred to a fingerling breeding pool after being temporarily fed for 2-3 days in a hatching pool, the density of the fingerlings is 5,000-10,000 per cubic meter, and the fingerlings are bred in fresh water; natural brackish water is gradually added until the salinity reaches 5-8 parts per thousand; water is added until the water level reaches 120cm on the third to fourth day after the fingerlings are put into the pool; bottom suction is carried out every day from the fourth to fifth day after the fingerlings are put into the pool and two thirds of water is changed every other day; two thirds of water is changed every day from the eighth to tenth day after the fingerlings are put into the pool; the fingerlings are separated and placed in different pools from the thirteenth to fourteenth day after the fingerlings are put into the pool and the salinity is gradually reduced until the brackish water is changed into fresh water; the density of air dispersion stones is 1.5 per square meter and is reduced to 1 per square meter in the later stage; the water temperature for fingerling placing is 21.5 plus or minus 0.5 DEG and is increased by 0.1 DEG every other 24 hours until being increased to 24.5 plus or minus 0.5 DEG; rotifers are fed to the fingerlings from the first to eighth day after the fingerlings are put into the pool; fairy shrimp larvae are fed to the fingerlings from the fifth to thirteenth day after the fingerlings are put into the pool; and freshwater cladocerans are fed to the fingerlings from the thirteenth to fourteenth day after the fingerlings are put into the pool.

Description

technical field [0001] The invention relates to aquaculture, in particular to a large-scale seedling production technology of puffer puffer in brackish water. Background technique [0002] Fugu obscurus (Takifugu obscurus) belongs to Fuguformes, Fugu suborder, Fuguidae, Fugu genus, 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". There has been a traditional habit of eating puffer fish in my country since ancient times, and puffer fish has always been regarded as a treasure on the table. Moreover, the liver and ovaries of puffer fish can extract tetrodotoxin, which can be used to treat neuralgia, spasms, nocturia, etc., with high economic value and medicinal value. Pufferfish obscurus is the main species of puff...

AI Technical Summary

Problems solved by technology

But at present, puffer obscura seed production is all carried out under the freshwater environment, and following problems can occur: 1) consume fresh water resource, need often change water during seed production, need consume a large amount of high-quality fresh water resources like this (production 1 10,000 fish fry, seed cultivation needs to consume 30-40 tons of fresh water); 2) Since puffer obscurus has been in freshwater environment for a long time during the artificial breeding and breeding period, many germs are vertically infected, so the seed cultivation should be carried out in freshwater environment Among them, fish fry are easy to breed pathogens, and seed production is prone to disease; 3) Puffer puffer obscura seedling cultivation adopts bait mainly Artemia larvae, and Artemia puffer larvae will die within 2-3 hours in a freshwater environment, while puffer puffer obscurus The fry will not eat the dead Artemia larvae, which will cause a waste of bait (especially in recent years, the price of Artemia has soared, 300,000-500,000 yuan / ton), so it also increases the cost of seed production, and at the same time, the discarded sinking Artemia larvae will also spoil the water quality. During production, it is necessary to increase the frequency of bottom suction and the amount of water change to alleviate this problem.

However, there is no report on the large-scale production technology of puffer puffer in brackish water

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