Integration of marine fisheries Biology and preservation biology for the Ariake temperate bass and Chinese temperate bass

本文研究了有赖鱼海域千古河口有赖鱼种群的各种生态特征，以及被认为是有赖鱼种群亲本之一的内岛地区中国温带石斑鱼的生长、成熟和仔鱼分布。另一类为多种，如Acartia omorii、Oithona davisae、Paracalanus parvus和Pseudodiaptomus marinus。前一组总是从浊度最大值处发现。中华对虾的肠道内容物主要由褐色素组成，而叶绿素a主要来自常见的沿海桡足类动物的肠道内容物。这些事实表明，上河口地区存在碎屑食物链。中华有鱼(Coilia nasus，…)的幼鱼阶段更多的新银鱼、黑刺五加、扁尾棘皮对中华绒螯蟹有专性捕食。根据养殖试验测定的营养富集值和半衰值，肠道内容物和肌肉的δ^&lt；13&gt；C表明，温带鳕鱼幼鱼于4月迁入淡水区，5~7月迁至中盐碱区，8月迁入海域。脱离养殖围栏或被丢弃的温带鳕鱼生长速度快于日本鳕鱼，性腺指数在11月和12月显著增加。我们认为它们可以在日本沿海水域成功繁殖，但我们无法收集卵、幼虫和幼体。DNA分析表明，在中国大陆的南部和北部地区有两个当地种群。本研究结果表明，在奇库戈口上游存在着一种独特的生态系统，具有高度浑浊的微咸水-特有的桡足类-特有的鱼苗之间的紧密联系。这似乎需要在中国或韩国河口的模型场进行相同类型的实地研究。较少

We have investigated various ecological aspects of the Ariake temperate bass population in the Chikugo estuary, Ariake Sea, and also growth, maturation and larval fish distribution of the Chinese temperate bass around Uwajima area, which was revealed as one of parental species for the Ariake population.Copepod distribution was separated by 2 groups : one is mainly composed of Ariake endemic species Sinocalanus sinensis which occupied low salinity area, particularly in 1 to 3 psu salinity. The other one is a group of multi-species like Acartia omorii, Oithona davisae, Paracalanus parvus and Pseudodiaptomus marinus. The former group was always found from the turbidity maximum. Major parts of gut contents of S.sinensis were composed of phaeo-pigment, while chlorophyll-a was dominantly detected from the gut contents of common coastal copepod species. These facts suggest that detritus food chain exists in the upper estuarine area.Juvenile stages of the Ariake endemic fishes as Coilia nasus, … More Neosalanx reganius, Acanthogobius hasta, Trachidermis fasciatus preyed exclusively S.sinensis. In contrast, common coastal fishes like amchovy and rock fish which are distributed in the estuary higher than 15 psu in salinity preyed a large variety of copepod species.Using the trophic enrichment value and half-life value determined under rearing experiments, δ ^<13>C of gut contents and muscle showed temperate bass juveniles immigrated into freshwater area in April, shifted to intermediate saline area in May to July, and finally emigrated to sea area in August.Chinese temperate bass, which escaped from aquaculture-pen or were discarded, could grow faster than the Japanese bass and the gonad somatic index markedly increased in November and December. We supposed they could successfully reproduce in Japanese coastal waters, but we could not collect eggs, larvae and juveniles. DNA analyses demonstrated there are two local populations in southern and northern areas of Chinese, continent. We could not find Chinese temperate bass in Ariake Sea, and all Ariake temperate bass have both genes special for Japanese and Chinese temperate bass.These results suggest that there is a unique ecosystem characterized by strong linkage of highly turbid brackish water- endemic copepod-endemic fish juveniles in the upper Chikugo estuary. It appears to be needed to conduct a same type of field research in a model field of Chinese or Korean estuary. Less