Technique of rearing fry of obscure puffer in low salinity sea water

Abstract

The invention relates to cultivation of freshwater fishes, in particular to a technique of rearing fry of the obscure puffer in low salinity sea water. The technique includes: selecting a pond; sterilizing the pond; cleaning the pond; injecting water and applying fertilizer; preparing for use of oxygenation facilities, and stocking the fry; managing rearing; spreading a net for exercise, distributing the fry to more ponds, and domesticating and feeding. The technique is characterized in that fry bags are allowed to float in the ponds before estuary soil ponds are selected and the fry are put in; pond water is then injected into the bags; the fry bags are shaken and stocked until interior salinity and water temperature of the fry bags and the pond water are moderate; fry stocking density is 8000-10000/mu; the water indexes include 5-15%. of sea water salinity, 16-28 DEG C of natural water temperature, larger than 5mg/L of dissolved oxygen, 7.5-8.5 of pH, and 30-50cm of transparency; when growing to 2.8cm long, the fry are domesticated with artificial feed; when growing to 3cm long, the fry are distributed into the ponds; the net is spread for exercise 1-2 days before distribution; stocking density of summerlings in each pond is 1500-5000/mu.

Description

technical field [0001] The invention relates to the artificial culture of freshwater fish in aquaculture, in particular to a technique for growing ponds of puffer puffer obscura in low-salinity seawater. Background technique [0002] Takifugu obscurus (Takifugu obscurus) belongs to Fuguformes, Fugu suborder, Fuguidae, and Fugu genus. It is mainly distributed in the Yellow Bohai Sea and the East China Sea in my country. It is a kind of anadromous migration and spawning fish. Groups of broodstock swim upstream into the river to lay eggs, and the juveniles are fattened in rivers or lakes connected to rivers, and return to the sea in the spring of the following year. Puffer obscurus mainly feeds on invertebrates such as crustaceans and shellfish and small fish in the natural environment. Pufferfish obscurus has plump meat, tender and delicious, rich in protein, but the fat content is the lowest among fishes. It is also rich in vitamins, minerals and a variety of trace elements t...

AI Technical Summary

Problems solved by technology

The routine breeding of puffer obscurus includes the black puffer pond (that is, the cultivation of the black puffer seedlings with a total length of 0.7-1.0cm from the nursery pond to the summer flower fish species with a total length of 3-3.5cm) selected in inland freshwater areas. , there are large-sca