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Method for rapid transfer of large yellow croaker fry

A technology of large yellow croaker and fry, applied in fish farming, application, climate change adaptation, etc., can solve the problems of fish fry clusters not being fished, affecting survival rate, hypoxia death, etc., to prevent hypoxia death and reduce stress The effects of stimulation and high seedling survival rate

Active Publication Date: 2014-10-15
宁德市富发水产有限公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there is still a long distance between the indoor seedling pond and the live water boat, and a large number of fry are placed in a small bucket, and many fry will die due to hypoxia, which affects the survival rate. Yellow croaker fry are prone to a large proportion of death and deformity
Finally, there are still many fry in the nursery pond that cannot be harvested due to the failure to cluster normally, which also causes a certain degree of waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Experimental basic conditions: (1) Two nursery ponds in the same batch, each with a size of 8m×4m×1.6m, with a storage capacity of about 1.5 million seedlings, and the average length of 45-day-old seedlings is 3.4cm. (2) The present invention is jointly operated by 5 persons, while the emergence method of the prior art is jointly operated by 10 persons.

[0018] Experimental steps of the present invention are as follows:

[0019] (1) Preparation of transportation means: fill the seedling compartment of the living water boat with sea water and keep it inflated;

[0020] (2) Seed concentration: Drain the nursery pond to a water depth of 30cm, stop aerating, use a flashlight to aim at the drain end of the nursery pond and cover other parts of the seedling cultivation with a black cloth, so that the large yellow croaker fry are concentrated at the lower part of the drain end of the nursery pond with light in a small corner;

[0021] (3) Siphon emergence: use a 60mm diamet...

Embodiment 2

[0031] Similar to Example 1, the difference is that the fishing rafts close to the nursery room are selected, and the fry are directly siphoned to the fishing raft cages without being transported by running water boats. After 15 days, the survival rate is about 12.3% higher than that of the control, and the deformity rate is reduced. 0.4%, saving 1.2 hours of accumulative time on the day of fry transfer.

Embodiment 3

[0033] Similar to Example 1, the difference is that the statistics of survival rate and deformity rate are carried out 30 days after being transferred to the sea cage. The survival rate increased by 9.4%, and the deformity rate decreased by 0.5%.

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Abstract

The invention discloses a method for fast transfer of large yellow croaker fry. The 40-50-day-old large yellow croaker fry grown indoors and with a total length of 2.5-4.0 cm are used to align a flashlight with a flashlight at the drain end of a seedling pond and use its characteristics of phototaxis and clustering. Cover the other parts of the seedlings with black cloth, so that the large yellow croaker fry are concentrated in a small corner of the illuminated drainage end, and the siphon tube is used to siphon the clustered seedlings into the water body of the seedling cabin of the live water boat with oxygenation or directly transfer them to the sea. At the same time, in the process of siphoning, the water inlet of the nursery pond adopts the flowing water method to keep the water level of the nursery pond unchanged, and siphon most of the fry in the nursery pond to emerge until it is difficult for the fry to cluster.

Description

technical field [0001] The invention relates to a fry transfer method, in particular to a method for quickly transferring large yellow croaker fry. Background technique [0002] large yellow croaker ( Larimichthys crocea ) is currently the largest seawater cage cultured fish in my country and one of the eight advantageous export cultured aquatic products. The annual breeding of large yellow croaker fry can exceed 1 billion, and it has always been in a leading position in my country's mariculture industry. In the process of large yellow croaker fry breeding, transferring from indoor cultivation ponds to fishing rafts for temporary breeding (commonly known as "emergence") is an important stage of large yellow croaker fry breeding, and it is also a process for large yellow croaker fry to accept natural seawater natural selection. Scientific and efficient transfer method is one of the important technologies for fry breeding of large yellow croaker. Therefore, how to improve th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01K61/00
CPCY02A40/81
Inventor 刘家富韩坤煌黄伟卿张艺刘招坤
Owner 宁德市富发水产有限公司
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