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1991年9月8日，慈利县渔政部门在茶庵柳林河潭第二次向澧水河投放鲤鱼、草鱼、鳊鱼、鳙鱼等鱼种20万尾，以增殖天然水域鱼类资源。 相似文献
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2004年9~12月,分别从氵鬲湖北部、中部和南部湖区采集了鲫鱼、鲤鱼和黄颡鱼等杂食性鱼类各60尾,总计180尾。通过对其肠道内的食物组成进行观察、分析和研究,计算出3种鱼类肠道中各食物的出现频率及百分比组成,通过此2种指标反映其食物组成。结果表明:由于氵鬲湖北部、中部水域的生态环境恶化,湖泊生物多样性明显下降,造成杂食性鱼类食物生态位的趋同性,有机碎屑和水草已成为氵鬲湖杂食性鱼类的主要饵料。氵鬲湖北部、中部水域生态环境严重恶化,已不适合杂食性鱼类生长。 相似文献
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今年5月26日,石柱土家族自治县渔政管理站向龙河投放杂交鲤鱼苗种十万尾,受到了群众的高度称赞。石柱土家族自治县地处四川盆地东部边缘,境内溪河纵横,有中、小河流五十余条,有较多的鱼类栖息、索饵、产卵、越冬的场所。近几年来,由于水土流失严重,新建厂矿较多,许多鱼类栖息、越冬的湾沱被毁,渔业水域污染严重,造成鱼类自然资源急剧下降,生态失去平衡。 相似文献
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《江西水产科技》2018,(5)
2018年6～10月在鄱阳湖湖区鄱阳、都昌、瑞洪及星子水域对397尾鲫鱼、575尾鲤鱼样本进行了生物学测定。在采集的样本中,鲫鱼最大体长25.5 cm,最大体重651 g;鲫鱼最小体长6.9 cm,最小体重12 g。鲤鱼最大体长为87 cm,最大体重18500 g;最小体长11.5 cm,最小体重31g。数据分析结果显示:鄱阳湖湖区鲤、鲫鱼体长体重关系为式为W_(鲤鱼)=2E-0.5L~(3.0445)(r=0.9951,n=575)、W_(鲫鱼)=2E-0.5L~(3.0383)(r=0.9939,n=397);在鄱阳湖湖区鱼类捕捞季节,鲤鱼、鲫鱼其捕捞规格分别以10～59.9 cm、10～14.9 cm为主,分别占70.25%和63.98%。 相似文献
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1991年5月3日，冒着绵绵细雨，芷江侗族自治县第三次江河鱼类人工放流现场会，在舞水窑湾塘河岸上隆重举行，40多万尾规格3～10厘米鲤鱼、草鱼鱼苗等放入河中。 相似文献
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Chenghui Wang Sifa Li Zoltn Tams Nagy Istvn Lehoczky Len Huang Yan Zhao Xiao Song Zsigmond Jeney 《Aquaculture Research》2010,41(9):1339-1347
China and Hungary are major providers of the common carp (Cyprinus carpio L.) in East Asia and Europe respectively. However, the genetic variation and relationship of this species in the two countries have been poorly understood. In this study, mitochondrial COII‐tRNALys and D‐loop sequences were analysed to investigate the genetic structure and relationships of the representative wild and domesticated common carps distributed in China and Hungary. The results indicated that the genetic diversities of the Chinese common carps are higher than those of Hungarian common carps, and the diversities of the wild common carps are higher than those of domesticated common carps in both the countries. Analysis of molecular variance and pairwise FST demonstrated a significant genetic divergence between the Chinese and the Hungarian common carps, and between the wild and the domesticated common carps. Bayesian phylogenetic analysis and statistical parsimony network showed an obvious genetic differentiation between the Chinese and the Hungarian common carps, between the wild and the domesticated common carps. However, a few specimens and haplotypes from the Chinese wild common carps appeared in the Hungarian common carps, demonstrating that there was no absolutely isolated and possible genetic linker between the Chinese and the Hungarian common carps. 相似文献
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金鸡湖养殖场以肥水养鱼而闻名,自８０年代开始单产已达１５０ｋｇ／１０００ｍ２以上,进入９０年代后,在养殖模式、经营管理上进行了调整和改进,现基本模式是平均每千平方米放２５．５ｋｇ、４５０尾左右,其中鲢、鳙占７５％,鲤、鲫、鳊等占２５％;平均单产１７４ｋｇ／１０００ｍ２,增肉倍数为６．８,其中鲢、鳙产量占６９％;利润率１００％;在捕捞、销售上实行常年捕捞、周年上市。 相似文献
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从转基因鲤的食用安全角度出发,研究了转基因鲤与正常鲤的营养成分和细菌致突变实验及对食用动物的影响。研究结果表明,转基因鲤与正常鲤肌肉中粗蛋白质含量分别为17.52%和17.45%、粗脂肪含量分别为2.55%和2.83%、灰分分别为1.29%和1.23%、水分分别为78.85%和78.27%,氨基酸总量分别为16.54%和16.77%,经统计分析,二者均无显著差别;其抗病能力虽稍弱于正常鲤鱼,经t值检验,无显著差别。而用转生长激素基因鲤作为食物,食用它的动物的各组织的重金属含量经过检测与对照组动物也没有显著差异(P>0.05),说明外源基因的插入没有引起作为食物的蛋白质、脂肪、氨基酸等组成的变化。 相似文献
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本文通过三年试验,测定了黑龙江野鲤的生长、饲养成活率、越冬成活率、抗病力、繁殖力、含肉率、鱼肉成份等主要经济性状。松花江下游野鲤群体生长快于镜泊湖、达赉湖和嫩江的群体。嫩江野鲤(♀)与兴凯湖野鲤(♂)杂交F_1,表现出生长的杂交优势。从鱼苗到性成熟野鲤的饲养成活率明显高于荷包红鲤和德国镜鲤。黑龙江野鲤具有极强的抗寒能力和抗病能力,它的这两个特性可以通过杂交转移给后代。野鲤的繁殖力很高,因此在黑龙江水系中保持较大的群体数量。野鲤的含肉率比其它鲤鱼高:在鱼肉成份中,有较高的蛋白质含量和较低的脂肪,含水量较小,鱼肉品质高。黑龙江野鲤的这些优良经济性状,是鲤鱼遗传改良的重要遗传材料,开发利用后必将产生巨大的经济效益。 相似文献
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根据线粒体控制区序列设计了青鱼(Mylopharyngodon piceus)、草鱼(Ctenopharyngodon idellus)、鲢(Hypophthalmichthys molitrix)、鳙(Aristichthys nobilis)物种特异的PCR引物,通过对四大家鱼受精卵的PCR扩增,种间交叉扩增,相关种类早期资源的扩增以及未知种类鱼卵的鉴定发现,所设计的引物具有很高的种类特异性,对特定种DNA具有良好的扩增效果,但是不能进行交叉扩增,对四大家鱼外的其它种类也不能扩增。实验没有出现一例假阳性或假阴性结果,说明所设计引物的种类特异性高。该方法特别适合从鱼类早期资源大量样本中准确快速鉴定四大家鱼种类。 相似文献
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约10000余尾注射牛和羊生长激素基因的鲤鱼已被生产出来，并从中筛选出生长速度快且整合了外源基因的个体143尾，也证明外源基因可传递给子代同时子代也具有快速生长的特征。建立了把外源基因直接注入受精卵的方法，确定了注入外源基因的最佳时期。 相似文献
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K. LORENZEN 《Fisheries Management and Ecology》1995,2(1):61-73
Abstract The population dynamics of culture-based fisheries are studied by means of a mathematical model, which incorporates explicit sub-models for density-dependent individual growth and size-dependent mortality. The model applies to populations of carps, i.e. common carp, Chinese carps, and Indian major carps, and coregonids.
The effects on production of stocking density and size of seed fish, fishing mortality, and size at harvesting are studied in a model population of carp. Management implications of the modelling results are emphasized. An adaptive approach to management, involving judicious experimentation with stocking and harvesting regimes, is proposed to gain information on the dynamics of actual fisheries, and to optimize their production. 相似文献
The effects on production of stocking density and size of seed fish, fishing mortality, and size at harvesting are studied in a model population of carp. Management implications of the modelling results are emphasized. An adaptive approach to management, involving judicious experimentation with stocking and harvesting regimes, is proposed to gain information on the dynamics of actual fisheries, and to optimize their production. 相似文献
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The effects of introduction of common carp, Cyprinus carpio (L.). in polyculture with major Indian carps and silver carp were studied in fertilized and fed earthen ponds in Mymensingh, Bangladesh. Bottom-dwelling common carp were found to exert an influence on the quality and quantity of planktonic food organisms. The presence of common carp significantly increased (P < 0.05) the growth of other carps including the bottom-feeder mrigal. Cirrhinus mrigala (Hamilton). A significantly higher fish yield (P < 0.05) was observed in the fish ponds containing common carp when the combined yields of all species in three treatments were compared. 相似文献