Assessment of Enhancement Effectiveness of Chinese Shrimp Fenneropenaeus chinensis Stock in the Laoshan Bay

Abstract:

Fleshy prawn Fenneropenaeus chinensis is one of the most important species for stock enhancement in the Laoshan Bay. To evaluate the potential effectiveness of releasing fleshy prawn stock enhancement, we analyzed the survival rate, growth rate, migratory pattern, and recapture rate of the released fleshy prawn using the Bhattacharya method based on the monitoring survey monitoring survey monitoring surveymonitoring and recapture survey of fleshy prawn from July to September 2012 in the Laoshan Bay. We found that the released prawn mainly inhabited in inner or middle part of the Laoshan Bay, in which the sediments were sandy or sand-mud substratum. In mid-August, the mean body length of the first and second batch released fleshy prawn were 144.9 mm and 130.5 mm, respectively. The ratios of the released and wild fleshy prawns to the total population were 92% and 8%, respectively. The fleshy prawn moved from shallow water to deep water when the water temperature decreased. During the study period (from late August to early October), a total of 0.996 million released prawns were collected with the 0.58% mean recapture rate of fleshy prawn in the Laoshan Bay, which might be explained by the food competition, enemy creature and habitat destruction. Although the recapture rate of fleshy prawn was low, the ecological, economic and social benefits were still gained from the stock enhancement of fleshy prawn in the Laoshan Bay.