Mixed culture technique of green crab

In recent years, the type of single culture of green crab has been rare, especially in the intertidal zone, the type of mixed culture is multi-species, and the type of mixed culture is more complicated. the basic principle is that through proper mixed culture of other economic species, it can purify the bottom material, form and maintain a suitable biological structure in the pond, and create an ecological environment suitable for green crab and mixed culture breeds to live and grow together. at present, there are more than 10 species of fish, shrimp, shellfish and algae.

Mixed culture technique of green crab

1. Shrimp. Such as Penaeus chinensis, Penaeus vannamei, Penaeus Monodon, Penaeus vannamei, Penaeus chinensis, Penaeus chinensis and Penaeus vannamei. The stocking specification of shrimp seedlings requires that the seedlings of more than 3 cm after temporary culture are generally about 1000 to 2000 pieces per mu, and the growth rate is faster than that of shrimp ponds on the tide. When the water temperature is suitable, the catch can begin after one month.

2. Fish. The main species are mullet, barracuda, black sea bream, catfish and so on. The condensed organic matter in the pond is the excellent bait for these fish, and the amount of seedling is generally different from 20 to 500 fish / mu.

3. Shellfish. Mainly mixed culture of some benthic shellfish, such as Sinonovacula constricta, mud clam, hairy clam, Philippine clam, green clam, etc.; for example, Sinonovacula constricta constricted Sinonovacula constricta as an example, the shoal area should be less than 20% of the pond area, and the coating surface of shellfish should be rested every year. The flat central beach surface can be released after deep turning and leveling, and the amount of seedlings per mu should be 30kg to 50kg.

4. Algae. Mixed culture of green crab and Gracilaria (called asparagus in Taiwan) is more common in Taiwan. Mixed culture of appropriate amount of algae can absorb a large amount of dissolved organic matter and increase the dissolved oxygen in the water body, which is more conducive to the growth of green crabs and other economic animals in the pond.

Matters needing attention in mixed culture

The main results are as follows: 1. The density of mixed culture should not be too high, the species should not be too many, and the cultivation of green crab should be given priority to. The daily management method should also be carried out according to the method of breeding green crab. If other species are too mixed and too high density, it will become noisy and affect the growth of green crab.

2. The mixed culture species should be selected according to the pond conditions, especially the pond bottom condition type is in line with the habitat of the culture species, such as cross-year culture varieties are not desirable, especially fish species, generally can not overwinter in the enclosure pond. The casualties of transplanting will be very large, which can only be improved to meet the requirements of mixed culture before the arrival of low temperature.