Study On The Biological Analysis Of Resources Of The Primary Shrimp And Crab Assemblages In The Coastal Of Shandong Peninsula

Shrimp and crab are important parts of Marine biological resources.With the decline of major economic fish resources,shrimp and crab have become an important Marine fishery objects.Therefore,the research and protection of shrimp and crab have become more and more important.This topic statistical analysis from 2013 to 2016 in Shandong Peninsula offshore fishery boat fishery log data analysis,and the Shandong coastal around 10 to 16 representative piers,the fishery season,on the shore fish in biology investigation mainly shrimp,crab,biological analysis,understand the main biological characteristics of shrimp,crab,community structure and the change ofbiological month,community structure analysis of the Coastal of Shandong Peninsular fishery resources,the main research results are as follows:1.According to the statistical analysis of fishery log data over the years,a total of 23 species of shrimp were recorded in the surveyed waters,belonging to 4 orders,11 families and 16 genera.It mainly includes Oratosquilla oratoria,Penaeus japonicas,Fenneropenaeus chinensis,Trachypenaeus curvirostris,Alpheus distinguendus,and Solenocera crassicornis.2.By contrastive analysis of the catch of four years,it was found that the catch of shrimp in May 2015 was the highest,reaching 26113.15 kg·kw-1,accounting for 49.42%of the total catch of shrimp in that year.Shrimp catches in June and July of each year were generally low,which was also consistent with the actual situation during the closed season.The overall shrimp catch level in 2013 was higher than that in other years.Shrimp catches in May and September 2016 were both high,accounting for 49.46%of the total catch.3.The monthly variation of shrimp resources in the Coastal of Shandong Peninsular was significant.The amount of shrimp in spring and autumn is higher than that in summer and winter.The average relative resource amount in January was the lowest,only 18.64 kg·kw-1.The average relative resource amount in May was the highest,18480.46 kg·kw-1,followed by 13130.69 kg·kw-1 in September.The average relative resource amount in each month of the year is 4949.48 kg·kw-1.Spring and autumn floods are very obvious in the relative change of resources.4.The dominant species composition of shrimps in the Coastal of Shandong Peninsular was very obvious,with significant monthly variation.The dominant species in the yellow and bohai sea are Oratosquilla oratoria,Acetes,Euphausia pacifica,Trachypenaeus curvirostris and Solenocera crassicornis.The dominant species of Oratosquilla oratoria and Acetes were all 12 months.Secondly,the dominant species of Trachypenaeus curvirostris was 9 months.Solenocera crassicornis as the dominant species were 3 months.The dominant month for Euphausia pacifica is 1 month.5.The monthly variation of shrimp community diversity index in the Coastal of Shandong Peninsular was obviously different.The number of shrimp species in the Coastal of Shandong Peninsular was the highest in April(14 species)and the lowest in July(3 species).In terms of annual average,the number of species in autumn and winter is slightly higher than that in spring and summer.6.Through the Coastal of Shandong Peninsular fishery operations,a total catch crabs 19 species.Accounted for the largest was the Dorippidae,followed by Pinnotheridae and Portunidae.Including Portunus trituberculatus,Charybdis japonica,Charybdis bimaculata and Eriocheir sinensis,etc.Overall,warm water species accounted for the vast majority of the catch,with an absolute advantage.7.Through comparative analysis of the four years' catch,it was found that the crab catch in September 2014 was the highest,reaching 5,041.60 kg·kw-1,accounting for 33.81%of the total crab catch in the year.The crab catches in June and July of each year were generally low,which was also consistent with the actual situation during the closed season.The overall crab catch level in 2014 was significantly higher than that in other years,reaching 15409.26 kg·kw-1.In September and October 2016,the crab catches were relatively high,accounting for 71.66%of the crab catches in that year.8.The monthly variation of crab resources in the Coastal of Shandong Peninsular was significant.The amount of crab in autumn was higher than that in other seasons.In January,the average relative resource of crabs was the lowest,only 8.62 kg·kw-1.The average relative resource amount in September was the highest,2099.4346 kg·kw-1,followed by October,1989.78 kg·kw-1.The amount of relative resources in August and September showed significant difference and increase.The average relative resource amount of crabs in each month of the year was 801.85 kg·kw-1.Autumn flood is reflected in the change of relative resources is very obvious.9.The dominant species throughout the year in the Coastal of Shandong Peninsular are the Portunus trituberculatus and Charybdis japonica.Among them,Portunus trituberculatus is the dominant species throughout the year.Followed by the Charybdis japonica,for 7 months of dominant species other types of catch are low and do not meet the criteria for annual dominance.10.The highest number of crab species occurred in October,and the lowest number occurred in July.From the annual average,the number of species in autumn and winter was significantly higher than that in spring and summer.The variation of crab community diversity index was more drastic.It was higher in autumn and winter and early spring months,followed by autumn months,and lowest in late spring and summer months.11.In this paper,the resource biological characteristics of 4 species of shrimp and 3 species of crab were studied,including body length,weight distribution and its relationship,sex ratio and feeding characteristics.