On the Salmonoid Fish, Salangichthys microdon, in Spawning Season, in Takahashi River, Okayama Prefecture
On the Salmonoid Fish, Salangichthys microdon, in Spawning Season, in Takahashi River, Okayama Prefecture
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冈山县高桥川产卵季节的鲑鱼（Salangichthys microdon）
DOI：
10.11369/jji1950.20.29
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发表时间：
1973
期刊：
影响因子：
--
通讯作者：
T. Senta
中科院分区：
文献类型：
--
作者：
T. Senta
在冈山县高桥河口进行四臂铲网捕捞，年产量为10-17吨。虽然在主要捕鱼季节（2月至3月），每艘船的日渔获量平均为7-8公斤，但渔获量波动较大且不规律，与农历或潮汐情况无明显关系。在这个渔场捕获的鱼体型相当大。该鱼的条件因子较高。雌性体长超过雄性，但体重相反。个体的性腺指数与条件因子之间不存在负相关关系，但产卵后的条件因子整体上明显下降。一对卵巢中大约有1300到2700个卵子。卵巢卵的数量与鱼的体长或体重之间没有明显的相关性。在鱼的消化器官中发现了gobiid鱼Chaenogobius sp.和mysid虾Neomysis sp.的幼虫。
Four-armed scoop net fishery for Salangichthys microdon Bleeker is operated in the Takahashi estuary, Okayama Prefecture, yielding 10-17 tons of the fish annually. Although the daily catch per boat averaged 7-8kg during the main fishing season, February to March, the catch fluctuated considerably and irregularly without obvious relationship with the lunar calendar or the tidal conditions. The fish caught in this fishing ground were rather large in size. The condition factor of the fish was found to be high. Females exceed the males in body length, but reversed in body weight. An inverse correlation between the gonad index and the condition factor was not found in individual fish, though a decrease in the condition factor after spawning was obvious for the group as a whole. About 1300 to 2700 eggs were counted in a pair of ovaries. There was no clear correlation between the number of ovarian eggs and the body length or the body weight of the fish. Larvae of a gobiid fish, Chaenogobius sp. as well as mysid shrimps, Neomysis sp. were found in the digestive organs of the fish.