文章摘要
黄权.鸭绿江上游花羔红点鲑的年龄_生长_食性和繁殖的研究[J].水产学报,1998,22(1):
鸭绿江上游花羔红点鲑的年龄_生长_食性和繁殖的研究
STUDIES ON AGE, GROWTH, FEEDING HABITS AND REPRODUCTION OF THE SAL VELINUS MALMA IN THE UPPER REACHES OF THE YALU RIVER
投稿时间:2014-05-07  修订日期:2014-05-07
DOI:
中文关键词: 花羔红点鲑 年龄 生长 食性 繁殖 鸭绿江
英文关键词: Salvelinus malma, Age, Growth, Feeding habits, Repro duction, Yalu River
基金项目:
作者单位地址
黄权 吉林农业大学水产系 吉林农业大学水产系
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中文摘要:
      花羔红点鲑的鳞片年轮特征为疏密—切割混合型。体长和体重关系密切,属均匀生长类型。主要以水生昆虫为食,对食物有明显的选择性;主要摄食季节为夏秋两季,但可终年摄食。雌雄鱼几乎2+龄达到性成熟,产卵期为10~11月。绝对繁殖力为280~500粒,每年产一次卵,属秋季产卵类型。产卵场底质为石砾,水深50~70cm,水流速度1.5~2.0m/s,水温一般为5~8℃。 更多还原
英文摘要:
      Sca les w ere used fo r the age determination. The annua-l r ing f eature belongs to the lo oseclo se and cut pa tter n. The a nnua-l ring is f ormed chiefly fr om Oct ober to December . The Do lly va rden charr , Salvelinus mal ma fe eds ma inly on aquatic insects, a nd on small ter re str ial a nimals and o thers. Feeding takes pla ce mainly in summer and aut umn, but it ma y be obser ved a ll the year r o und. Mo st of the fem ale s and ma les r each the f ir st m atur ity in the a utumn o f their thir d y ear o f lif e, although some may r each the first maturity in sec ond y ear . The spawning too k place fr om Octo be r to No vem ber and the individual absolute fecundity r anges fr om 280 to 500 eg gs. Fish spawns o nce in a ye ar in aut umn. The enviro nmental conditio ns of the spaw ning g ro unds need gr av el in the bo ttom, 50~ 70 cm in w ater depth, 1. 5~ 2. 0m/ s in wate r f low ing speed and 5~ 8 e in w ater temper tur e.
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