文章摘要
费鸿年,郑修信.南海北部底层鱼类群聚的研究——Ⅰ.北部湾拖网渔轮渔获物组成的变化[J].水产学报,1965,2(1):1~19
南海北部底层鱼类群聚的研究——Ⅰ.北部湾拖网渔轮渔获物组成的变化
STUDIES ON THE DEMERSAL FISH COMMUNITY OF NORTHERN SOUTH CHINA SEA. Ⅰ.CHANGES OF SPECIES COMPOSITION IN CATCHES OF BULL TRAWLER IN THE GULF OF NORTH PART(TONKIN GULF).
  
DOI:
中文关键词: 尾鳍  二倍体细胞系  染色体
英文关键词: 
基金项目:
作者单位
费鸿年 水产部南海水产研究所 
郑修信 水产部南海水产研究所 
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中文摘要:
      在1931~1938年曾有日本拖网渔轮在北部湾捕鱼,当时我国只有拖网帆船在那里作业,1954年我国在该海区开始进行拖网渔轮生产以来,逐年有了发展。拖网渔轮渔获物组成,可以提供了解作业海区底层鱼类群聚结构的概况,真子渺(1956)和真道重明(1957)曾作过东海、黄海拖网渔轮渔获物组成及其变化的分析,后者指出了抗日战争前后期间渔获物组成所起的变化,为进一步分析该海区底层鱼类资源提供了初步资料。
英文摘要:
      Based on the fishing records of bull trawlers operated in the Gulf of North Part(Tonkiu Gulf) by the Nanhai Fisheries Company during the years 1957-1960,seasonal and annual changes of species composition in the catches for differentregions of the gulf were examined in present studies. Thirteen subregions are adoptedin this paper corresponding to the customary boundaries of principle fishing groundsgenerally used. Their numbers and extents are tabulated in a table accompanied with achart. The percentages of species are derived from the average catch per haul ineach subregion or whole region over the whole period of 1957-1960. Rank correalationcoefficients, known as Spearmen's ρ, are calculated for the pairs of subregions, seasonsand years of species compositions, with which the status of changes is discussed. Quantitative data for twenty-two species or groups of fishes and one group ofsquid are available in fishing records. The calculation of the percentages in speciescomposition for the whole region after the following figures: Nemipterus spp. 18. 6,Lujianus erythropterus 10. 7, Upeneus spp. 9. 6, Priacanthus spp. 9.0, Saurida spp.8.1, Caranx malabaricus 4. 0, Arius sp. 3. 4, Squid 2.4, Parargyrops edita 2. 4,Pentaprion Longimanus 1. 5, Therapon theraps 1. 3, Pomadasys hasta 1. 1, Wak spp.0. 9, dogfishes 0.8, Psenes indicus 0. 6, Taius tumifrons 0. 4, Epinephelus spp.0. 4, Trichiurus haumala 0. 2, Pagrosomus major 0. 1, Muraenesox cinerus 0. 1, andother species including unclassified fishes 22. 8. In gerenal, the percentages of speciescomposition for subregions are not similar to those of the gulf as a whole, butmost of them have considerable identifical trends. They are shown in the histograms(Fig. 2(1) (2)]. The rank correlation coefficients of species composition between subregions over four years have been calculated. They show that positive correlations are presentedbetween most subregions. Most significant-levels of correlation coefficient ρ≥0. 66are found between nine subregions with either subregion Ⅳ or Ⅸ, while subregion Ⅴwith only one subregion bears such level of significance correalation.There is no sig-nificant correlaion found between subregion Ⅱ-Ⅶ, Ⅱ-Ⅷ, Ⅱ-Ⅻ, Ⅵ-2-Ⅴ orⅥ-2-Ⅶ, their coefficient ρ'is 0.40. The dissimilarities of the seasonal and annual changes in relative indices of abun-dance of species composition for different subregion are noticeable. They are illus-trated by diagrams. with the help of a number of text-figures to show the curves ofrank correlation coefficients plotted by coefficient values between seasons as wellas between years reciprocally, the variations are found to be more conspicuous whenthe seasons turning from March to April and from September to October, and to beless conspicous when the season turning from December to January and from June toJuly. According to the figure of curves mentioned above, four types of trends inseasonal variations of species composition for different subregion and the gulf asa whole have been recognized. Subregiou Ⅷ, Ⅸ and Ⅺ and whole region are denotedas type 1, subregion Ⅱ, Ⅲ, Ⅴand Ⅵ-1 as type 2, subregion Ⅶ,Ⅹ and Ⅻ as type3, and subregion Ⅳ as type 4. their characteristics are described. The classificationof seasonal variation trends mentioned above is found to be applicable to those ofannual variation with minor differences, In contradiction to subregion Ⅷ belongto type 2, subregion Ⅹ belong to type 3 in seasonal variation, they are consideredas type 4 and type 2 of annual vatiation respectively. It seems probable that relationship of geographical positions of the subregionis one of the essential factor which makes the seasonal and annual variations ofspecies composition much alike among some subregion or differing among the others.In general, the neighboring regions usually maintein their trends is a similar fashionin these variations than the remote ones. The index of diversity after Magalef(1960) has been applied to demonstrate the status of the demersal fish communityof the regions investigated.
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