| Fishing log is the relevant record of fishing vessels in the process of fishing during the catch day,including the catch time,location,fishing areas,species and fishery product and so on.It is an important data for studying fishery resources.Based on the fishing logs of Haiyang,Wendeng and Rushan,typical information sites in southern Shandong Peninsula from 2016 to 2018,the species composition,catch,dominant species and biodiversity characteristics of fishery resources in the southern waters of Shandong Peninsula were preliminarily analyzed.Through the comparison with the historical survey data of Shandong coastal area,the catch of fishery resources in the southern waters of Shandong Peninsula has improved,but there is still a large gap compared with the historical resources,the number of resource types shows a downward trend,and the dominant species change rapidly.These are my results:1.The annual average catch from 2016 to 2018 was 3025.15 kg·kW-1,1056.07kg·kW-1 and 1048.27 kg·kW-1,the annual average catch decreased year by year,and the catch in 2017 was 55.24%,it is lower than that in 2016.The downward trend was obvious.There is little difference between 2018 and 2017.The months with higher monthly average catch of three years were concentrated in March,April,May and September,October,December,and there were obvious spring and autumn seasons in fishery resources.2.From 2016 to 2018,41 species of catch were recorded,belonging to 19orders,33 families and 39 genera,including 33 species in 2016,32 species in 2017and 33 species in 2018.There are 28 species of fish,6 species of Crustaceans,4species of Cephalopods,1 species of shellfish,1 species of Polychaete and 1 species of Jellyfish.The species number similarity between spring and autumn is higher.3.The distribution of fishing area in June 2018 was the broadest in September-November,and it was less in January,February and July.As the temperature drops,the fishing areas move south.Most of the fishing areas are in the north of the yellow sea.The fishing area moves south in the autumn and winter.Autumn was the broadest.4.The dominant species in 2016 were the Engraulis japonicus,Lophius litulon and Scomberomorus niphonius,Engraulis japonicus,Lophius litulon,Oratosquilla oratoria and Liparis tanakae are dominant species in 2017.Lophius litulon,Liparis tanakae,Scomberomorus niphonius,Rhopilema esculentum,Engraulisjaponicus,Trichiurus japonicas and Pseudosciaena polyactis are dominant species in2018.From 2016 to 2018,both Engraulis japonicas and Lophius litulon were the dominant species in the three years,while Scomberomorus niphonius was the dominant species in 2016 and 2018.The dominant position of Engraulis japonicus decreased obviously and the dominant species changed rapidly.5.The season with the highest diversity index of 2016,2017 and 2018 was autumn,the diversity is higher in spring and lower in winter and summer.Most of the months with higher richness were concentrated in spring and autumn,and the richness index was higher in the spring and autumn of three years.The variation of evenness in September,October,November and December of 2016—2018 was not significant,which was between 0.40 and 0.81. |
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