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Novel selecting and breeding method for gift strain of nile tilapia

A technology for Nile tilapia and female fish, applied in animal husbandry and other directions, can solve problems such as insufficient genetic stability

Inactive Publication Date: 2007-03-14
李思发
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the fact that this introduced species is the third generation of hybridization and selective breeding among 8 populations of Nile tilapia species, the heredity is not stable enough and has the potential for further improvement. In order to further improve the breeding of this strain of Nile tilapia performance, improve its genetic stability, and cultivate new species of tilapia suitable for the development of China's tilapia industry. It is necessary to use Gifuni tilapia as the basic population for further breeding work

Method used

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  • Novel selecting and breeding method for gift strain of nile tilapia
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  • Novel selecting and breeding method for gift strain of nile tilapia

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The establishment of embodiment 1 breeding line and control line

[0046] 1. Determination of the basic population for breeding

[0047] Because the rich strain Nile tilapia has obtained unanimous good evaluation at home and abroad, and begins to promote all over the world, so it is determined to select the rich strain Nile tilapia introduced in 1994 as the selection base population of the present invention.

[0048] 2. Establishment of selective breeding lines

[0049] At the end of 1996, in the three test bases, the Nile tilapia with standard body shape and healthy Nile tilapia were selected to establish breeding lines. 455 females and 233 males were selected in the national Qingdao tilapia breeding farm; 70 females and 31 males were selected in the national Guangdong tilapia breeding farm; selected in Bengbu Fisheries Research Institute of Anhui Province 300 females and 100 males were caught. A total of 825 female fish and 364 male fish.

[0050] 3. Establishment...

Embodiment 2

[0052] Embodiment 2 generation by generation selection

[0053] Gifu strain Nile tilapia is a small fry (summer flower) of 2-3cm when it grows to the age of 50 days; when it is 100 days old, it is a small fish of 10-15cm; More than 24cm, body weight more than 480g; at the age of 300 days, the body length of adult fish is more than 28cm, more than 750g.

[0054] Adopting the group selection method, it takes about 1 year from fry cultivation to broodstock, during which four selections are carried out, and the total selection rate is 6% (60% × 50% × 50% × 40% = 6%) (see Table 1 ,figure 1). There are three selection criteria: one is the growth rate, that is, the fastest growing fish is selected; the other is the morphological characteristics, and those with inconspicuous morphological characteristics will be eliminated; the third is the genetic purity.

[0055] steps

age (days)

selection criteria

Selectivity (%)

1

2

3

4

50

100 ...

Embodiment 3

[0059] Each year's growth performance evaluation in the breeding process of embodiment 3

[0060] 1. Growth performance evaluation of F3 and F0 in 2000

[0061] In three test bases, the comparative test of the growth performance of the breeding line F3 and the control line F0 was carried out at the same time. A completely randomized block design was used. F3 and F0 have fin-cut flags and are polycultured in the same pond. There was no significant difference in body weight between F3 and F0 when stocking. The Qingdao experiment began on June 7, 2000, with three repetitions, and the flowing water cement pool used summer flowers that multiplied early in the year, with an initial weight of 0.021-0.027g; the Guangdong experiment began on June 3, 2000, and three Repeatedly, the still water cement pool used the summer flowers that multiplied early in the year, and the initial weight was 1.22~1.40g; the Bengbu experiment began on June 8, 2000, four repetitions, the still water ceme...

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Abstract

The invention relates to a method for breeding fish. Wherein, it comprises: (a) selecting JeFu luoluo fish as the basic group; (b), separating and breeding the male and female fishes, to match the grown female and male ones to lay eggs, to improve the synchronization, while from fish fry to the parent, selecting the ones with high growing speed, large and better shape, and the total selection rate of each generation is 6%; (c), breeding the fish selected in step (b), tracking and watching the growth, color, and mature condition of fish; (d), repeating the steps (b) and (c) for 4-15 times (better than 8 times). The growth speed of said inventive JeFu luoluo fish is 30% than basic group, while the kind purity is 90% higher.

Description

technical field [0001] The present invention relates to the breeding technology of fine fish species, and more specifically, the present invention relates to the breeding technology of new Jifu tilapia. Background technique [0002] Since the introduction of Nile tilapia in mainland China in 1978, the tilapia aquaculture industry has developed rapidly. From 1984 to 1998, its output increased rapidly at an average rate of 87%, much higher than the growth rate in other parts of Asia during the same period, and became one of the main freshwater aquaculture objects in China. Especially since 2000, tilapia farming and processing products have become an important foreign trade product in my country. In 2004, China's tilapia aquaculture output reached 906,300 tons, accounting for 68% of the world's tilapia aquaculture output. [0003] The current per capita share of aquatic products in mainland China has just reached the world average level, but the actual consumption level is re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01K67/02
Inventor 李思发何学军蔡完其
Owner 李思发
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