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Cultivating method for soft shell freshwater crab

A breeding method and technology for soft-shell mud crabs are applied in the field of crab breeding, which can solve the problems of difficulty in grasping, eating, and hardening of the shell, and achieve a situation that is conducive to shelling, reducing fighting, and realizing large-scale and industrialization. Effect

Inactive Publication Date: 2006-09-13
冯志江
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is generally difficult to obtain large quantities of soft-shell blue crabs at present, mainly because the natural shelling of blue crabs has a relatively large seasonality, generally between July and October in the Gregorian calendar, and the current shelling of blue crabs artificially cultivated The situation is difficult to grasp. After molting, the shell of blue crabs hardens quickly, or is eaten by the same kind and natural enemies, resulting in a small number of soft-shell blue crabs finally obtained, which is difficult to meet market demand.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment one: a kind of cultivation method of soft-shell mud crab, the method comprises the following steps: 1. setting 20 cement ponds with an area of ​​100 square meters and a height of 1.6 meters, laying 18 cm thick fine sand at the bottom of the cement ponds , set some bricks and tiles and pots on the fine sand surface; ②Introduce aquaculture seawater into the cement pond, the temperature of aquaculture seawater is 23℃~25℃, the salinity of aquaculture seawater is 18.8‰, and the pH value of aquaculture seawater 8.1, the dissolved oxygen of the cultured seawater is 5 mg / liter, the transparency of the cultured seawater is 35 centimeters, the water color of the cultured seawater is yellow-green, odorless, and the hydrogen sulfide content of the bottom water of the cultured seawater is 0.008 mg / liter; The crabs are divided into 10 grades according to the degree of fatness and thinness, and they are stocked in 10 cement ponds respectively. The female crabs are divided in...

Embodiment 2

[0016] Embodiment two: a kind of cultivation method of soft-shell mud crab, this method comprises the following steps: 1. 20 cement pools with an area of ​​100 square meters and a height of 1.6 meters are set, and 15 cm thick fine sand is laid at the bottom of the cement pools , set some brick tiles and broken tile pots on the fine sand surface; ②Introduce aquaculture seawater into the cement pool, the temperature of aquaculture seawater is 18℃~21℃, the salinity of aquaculture seawater is 12.8‰, and the pH value of aquaculture seawater is 8.0, the dissolved oxygen of the cultured seawater is 4.8 mg / liter, the transparency of the cultured seawater is 30 centimeters, the water color of the cultured seawater is yellow-green, without odor, and the bottom water hydrogen sulfide content of the cultured seawater is 0.009 mg / liter; The crabs are divided into 10 grades according to the degree of fatness and thinness, and they are stocked in 10 cement ponds respectively. The female crabs...

Embodiment 3

[0017] Embodiment three: a kind of cultivation method of soft-shell mud crabs, the method comprises the following steps: 1. 20 cement pools with an area of ​​100 square meters and a height of 1.6 meters are set, and 20 cm thick fine sand is laid at the bottom of the cement pools , set some bricks and tiles and broken pots on the fine sand surface; ②Introduce aquaculture seawater into the cement pond, the temperature of aquaculture seawater is 21°C-23°C, the salinity of aquaculture seawater is 26.2‰, and the pH value of aquaculture seawater 8.3, the dissolved oxygen of the cultured seawater is 4.5 mg / liter, the transparency of the cultured seawater is 40 centimeters, the water color of the cultured seawater is yellow-green, without odor, and the bottom water hydrogen sulfide content of the cultured seawater is 0.095 mg / liter; The crabs are divided into 10 grades according to the degree of fatness and thinness, and they are stocked in 10 cement ponds respectively. The female crab...

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Abstract

The cultivation method of soft shell blue crab includes: setting cement ponds with spread fine sand of 15-20 cm thickness, bricks, tiles and crushed earthen jar in the bottom; preparing sea water for cultivation of 15-31.5 deg.c temperature, salt content of 0.65-3.3 %, pH value 7.6-8.9, dissolved oxygen over 4 mg / L, transparency of 20-40 cm, yellow green color, no bad smell and HS content less than 0.01 mg / L; separating male crab and female crab in different ponds and separating crabs with different fatness degree in different ponds; feeding with shells, fresh small fishes; and disinfecting ponds with lime water once every 14-16 days.

Description

technical field [0001] The invention relates to a method for cultivating crabs, in particular to a method for cultivating soft-shell blue crabs. Background technique [0002] Blue crab is a kind of crustacean aquatic product with delicious meat, which is favored by consumers in the market. At present, the hard-shell mud crab is mainly supplied in the market, but this hard-shell mud crab is troublesome to eat, so the sales price is not high, the sales volume is not large, the economic benefit is low, and the supply exceeds the demand in the market. . Correspondingly, a kind of shelled soft-shell mud crab is in short supply in the market, and the market price is 4 to 5 times higher than that of common hard-shell mud crab. However, it is generally difficult to obtain large quantities of soft-shell blue crabs at present, mainly because the natural shelling of blue crabs has a relatively large seasonality, generally between July and October in the Gregorian calendar, and the cu...

Claims

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Application Information

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IPC IPC(8): A01K61/00
CPCY02A40/81
Inventor 冯志江
Owner 冯志江
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