Ecological Studies of Rare Fish, Coilia nasus and Salangids in Ariake Sound and its River.

有明海峡及其河流珍稀鱼类、鲚鱼和鲚鱼的生态研究。

• 批准号: 07660248
• 负责人: MATSUI Seiichi
• 金额: $ 1.41万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07660248/
• 关键词: Coilia nasus; Neosalanx reganius; Salanx ariakensis; Chikugo River; Spawning Area; Maturation; Rare Fish; Rearing; 飼育; 底質; 人工受精; 耳石日周輪

Maturation, Spawning, Development of Egg, Rearing to young fish stage from egg, growth were investigated for Engraulid fish, Coilia nasus, Salangids, Neosalanx reganius and Salanx ariakensis in mainly tidal area of Chikugo River and Ariake Sound. There species distibute in only Ariake Sound and some rivers in Japan. Especially Coilia nasus and Neosalanx reganius are the endemic species in this water. This study was clarified that the spawning time of this Coilia grows late from about sunset in May to about 3 p.m.in August of spawning season and the spawning frequency of this species is only a single during the season according to egg diameter component and histological observation of the gonad. Relation between the day after the hatching (X) and the number of ring on the otolith (Y) is shown by Y=0.9782X+1.0389 and ones from the day age (X) and the body length in mm (Y) Y=0.6857X+2.2976 under the rearing, Y=0.7817X+0.2277 under the wild, respectively. The spawning area of the Coilia is … More 10-24km upper reach from the river mouth of Chikugo and this area is tidal area without the salinity. Neosalanx spawns adheshive eggs among coarse sands in almost same area as Coilia's. Relation between the hatch out hour (Y) and water temperature is shown by Y=1.05x10^5/X^<2.18>, as the water temperature of spawning season, from middle of March to early of June, alters 13-24ﾟC,the hatch out hour changes from 16days to 4days. Generaly Salangid doesn't ossify sufficiently in comparison with other Teleostei and this species especially is few in intramembranous ossification, such as the fontanel opens broadly and the unossified adjacent bone during its life. Relation between the day after the hatching (X) and the number of ring on the otolith (Y) is shown by Y=0.99X+0.92 and the ring is formed one before the hatch out, thereafter one per day. The Growth is shown by Total length in mm=0.38x Days after hatch+4.48. It grows about 0.4mm per day, attains the juvenile stage after 36days, to 35mm TL on October, maturates in 38-68mm TL and dyes after several spawns in a year life. The spawning area of Salanx ariakensis locates in 5-25km distance upper reach from Chikugo river mouth and this species spawns also among the sands-gravels and in low Ig loss, high equality and curvature coefficients, and 50% value of sediment. Less

成熟，产卵，鸡蛋的发展，从鸡蛋中饲养到年轻的鱼阶段，为共生鱼类，coilia nasus，salangids，neosalanx reganius和salanx ariakensis投资，主要是Chikugo River和Ariake Sound的Ariakensis。在日本，物种仅在Ariake Sound和一些河流中散发出来。尤其是Coilia Nasus和Neosalanx Reganius是这种水中的内在物种。这项研究澄清了，该卷轴的产卵时间从5月的日落大约到了产卵季节的8月下午3点，并且该物种的产卵频率在本季节仅是一个单一的，根据卵直径的成分和性腺的组织学观察。孵化后的第二天与耳托（y）上的环数之间的关系以y = 0.9782x+1.0389的形式显示，从白天（x）起的Y = 0.6857x y = 0.6857x+2.2976+2.2976在饲养下，y = 0.7817x+0.22277 sufter，y = 0.7817x+0.22277。卷轴的产卵区是…距离奇库戈河口10-24公里的上游更多，该区域是潮汐区，没有盐度。 Neosalanx在几乎与Coilia的面积的粗砂中产生了Adhishive鸡蛋。孵化时间（Y）与水温之间的关系由y = 1.05x10^5/x^<2.18>作为产卵季节的水温，从3月中旬到6月初，改变了13-24°C，孵化时间从16天变化，从16天到4天。与其他Teleostei相比，Salangid将军并没有充分骨化，尤其是该物种在膜内骨化中很少，例如Fontanel在其一生中广泛打开和未腐烂的相邻骨骼。孵化（x）后的第二天与耳石（y）上的环数之间的关系由y = 0.99倍+0.92显示，并且环在孵化之前形成一个，此后每天每天1个。在孵化+4.48后，以MM = 0.38倍的总长度显示了生长。它每天生长约0.4毫米，在36天后达到少年阶段，10月在35mm TL，在一年生命中几个产卵后成熟38-68mm TL和染料。 Salanx Ariakensis的产卵区域位于距奇库戈河口的5-25公里距离上游，该物种也呈现在砂粒中，低IG损失，高等的平等和曲率系数，而沉积物的价值为50％。较少的