Although the artificial breeding of squid has been successful, due to the failure to produce large quantities to meet the needs of production, the currently used squid for aquaculture mainly rely on coastal fishing.
(I) During the fishing season of carp fry When the carp seedlings are 1.5 cm in length, they are transported to the estuarine, port, sluice, and other shallow water areas in brackish water. This is suitable for harvesting. Due to different climatic conditions in different parts of the world, there is a difference in the time for the eel to start breeding. Therefore, the emergence time of eel in the coast is different, Guangdong and Fujian are from December to April, and Hangzhou Bay in Zhejiang is the harvesting period from March to May. Jiangsu Dongtai area was in April-July. According to the people's experience, the distribution of carp seedlings has the following characteristics:
(1) At the mudflats and harbors, the bottom soil is sandy soil with more algae. When the tide rises, the carp seedlings come to feed and they are easy to catch.
(2) There is a deep pool in the harbor. After the tide has receded, it still retains a certain depth of water. At this time, fry can be easily left.
(3) Miao more at the brackish water interchange, because the seedlings have the habit of advancing upstream and bring in abundant food due to inflow of inland water.
(4) The weather is clear, the temperature is high, and there is no wind. Fish like to concentrate on the crickets.
(II) Fishing methods for salmon fry
1. The light trapping method has the characteristics of phototaxis because of the seedlings. In the dark night without moon, when the tide is low, the vaporized kerosene lamp is set up at the harbor to induce the seedlings to swim to the vapor lamp, and then they are caught in the pre-positioned fixed fish net. This method of trapping seedlings not only captures a large amount, has a low cost, and costs less labor. At the same time, the caught fry is not easy to be injured, and the quality is good and the survival rate is high.
2. The net is a semi-circular iron or wooden frame, approximately 50 centimeters wide, and is connected to a handle that supports a nylon fry mesh or other dense mesh. Use dip nets for catching in the mudflats or shallow water bays. This method is easy to operate but has a small catch.
3. The hand trawl catcher trawl net length 3 to 5 meters, height 70 centimeters, the floater is connected to the cork floater or plastic floater, Shen Zigang is connected to the sinker, the net coat is connected on both sides of the wooden stick or bamboo rod as the handle, operated by two persons The estuary or the tidal flat rushed to collect water. At present, Guangdong Province has the most use of this method. This method captures more than the handprint network.
(3) Identification of salmon fry While catching fry fry, it often catches a large number of pointed seedlings, eel fry and other miscellaneous fry. In order to obtain pure salmon fry, various fish fry must be identified. Morphologically, salmon fry and eel fry and other fry are easier to distinguish. The carp seedlings are well-proportioned. “The eyes are small and the backs of the black belly swim quickly. The carp seedlings are short and flat. The body color is light yellow with black spots. Swimming is slow. In Guangdong, the caught carp seedlings are more The seedlings are mixed together because the two fish fry shapes are relatively close and difficult to distinguish.According to the fishermen's experience, the carp seedlings appear to be relatively smooth to the naked eye, and the sharp seedlings are rough; the back of the seedlings is silver-gray, and the abdomen is silver. White, pointed pods are blue-gray in color.In the cage, when gently lifting one side of the cage, the salmon fry can quickly swim to the other side of the cage, while the tip rake is attached to the net. On the slice, the two species of carp seedlings can be identified.
(4) When the eel fry is caught, the eel fry will not be transported for long-distance transport when the eel fry is caught immediately after catching the eel, and if it is handled improperly, it will not be able to carry long-distance transport. If it is to be stocked, it must be domesticated to adapt it to breeding. surroundings. Coastal fishermen in Guangdong currently use small earthen ponds to raise eel fry. Dig a small earthen pond about 100 square meters near the trapping port. The depth of the pond is about 80 cm. The bottom of the pond is best made of sandy soil. The pond is filled with brackish water, and the salinity is 15 to 20 and suitable for catching. The abalone seedlings immediately came into the pond for raising, gradually adding fresh water, slowly changing the salinity of the pool water, and ultimately achieving a similar salinity in the aquaculture water. Generally, it takes 1-2 weeks for the process of diluting domestication.
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