| In the background of the general decline of fishery resources,the fishery resources enhancement and releasing work is a very effective measure to improve the number of fishery resources,improve the marine ecological environment and improve the economic income of fishermen,which has great practical significance.In this paper,by referring to the previous research,we analyzed the present development status of enhancement technology in Shandong province from 2010 to 2016.According to the background of resources survey before releasing,tracking survey after releasing,relative quantity survey and other important survey of the Fenneropenaeus chinensis,Portunus trituberculatus,Rhopilema esculenta and other important releasing species,we studied the current status of the enhancement work in Shandong province and discussed the prospect of enhancement work from the perspectives of ocean environment,suitable types,economic benefits,ecological benefits and social benefits,and put forward relative suggestions to Shandong province,in order to provide a theoretical basis for the future scientific enhancement and releasing work.The studies showed that:1 In the perspective of enhancement and releasing technology.At present,the development of enhancement technology in Shandong Province had been very mature,with perfect fish enhancement technology,crustacean enhancement technology,Rhopilema esculenta enhancement technology,cephalopods and other species enhancement technology.Shandong province had strict technical specifications covering releasing area selection,carvel cultivation,carvel transport and the final artificial releasing,and formed a mature evaluation system on enhancement technology and enhancement effect.2 In the perspective of releasing species.The main species in Shandong province were Fenneropenaeus chinensis,Portunus trituberculatus and Rhopilema esculenta.Other fish species included Pleuronectiformes,Pseudopleuronectes yokohamae,Cynoglossus semilaevis,Sebastes schlegelii,et al.Bottom sea enhancement shellfishes included Ceretrix meretrix,Scapharca subcrenata,Patinopecten yessoensis,et al.And sea treasures included Stichopus japonicus,Hemicentrotus pulcherrimus and Haliotis discus hannai.3 In the perspective of enhancement scales.The main species in Shandong province were Fenneropenaeus chinensis,Portunus trituberculatus and Rhopilema esculenta.Enhancement area were mainly in Laizhou Bay and Bohai Bay of northern Shandong Peninsula,and Jinghai Bay,Wuleidao bay,Rushan Bay,Tashan bay,Dingzi Bay,Jiaozhou Bay,Laoshan Bay and Huangjiatang bay of southern Shandong Peninsula.The annual releasing number of Shandong province was above 2106.6×10~4,the annual recapture yield was above 240 t,and annual output value was more than 16 million yuan.From 2010 to 2016,the annual releasing Fenneropenaeus chinensis of Shandong Province was 138583.21 x 104 tails,the average yield was 1123 t,and average annual output value was 175.93 million yuan.The annual releasing Portunus trituberculatus was 14367.78 x 104 tails,the average yield was 5308.66 t and the average annual output value was 305.0 million yuan.The annual releasing Rhopilema esculenta was 24928.70×10~4,the annual production capacity was 12890.36 t and the annual output value is 124.32 million yuan.4 In the perspective of the enhancement prospect.Shandong Province had long coastline and a relatively vast sea area,and the releasing waters could be divided into the southern Bohai Bay,Laizhou Bay,the northern Shandong Peninsula coastal zone and southern Shandong Peninsula coastal zone.The natural conditions of these areas were superior and they were suitable for fishery enhancement.At present,there were above 15 species like fish,shrimp,crabs,shellfish,cephalopods and Rhopilema esculenta been released.In addition,the enhancement had brought great economic benefits.on the other side,it was an effective measure for the fishery resources recovering,ecological environment improving,and having remarkable economic,ecological and social benefits. |
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