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首页> 外文期刊>ICES Journal of Marine Science >Relationships between fish stock changes in the Baltic Sea and the M74 syndrome, a reproductive disorder of Atlantic salmon (Salmo salar)
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Relationships between fish stock changes in the Baltic Sea and the M74 syndrome, a reproductive disorder of Atlantic salmon (Salmo salar)

机译：波罗的海鱼类种群变化与大西洋鲑（Salmo salar）生殖疾病M74综合征之间的关系

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摘要

The M74 syndrome of Baltic salmon {Salmo salar), which appears as increased yolk-sac fry mortality (YSFM), impairs the reproduction of salmon stocks. Changes in the prey stocks of Baltic salmon in its two feeding areas, the southern Baltic Proper (BPr), where sprat (Sprattus sprattus) was the main prey species during the high incidence of M74, and the Bothnian Sea, where herring (Clupea harengus) is the dominant species, were analysed in relation to salmon growth and size and in relation to the incidence of M74. The high condition factor (CF > 1.05) of prespawning salmon predicted high YSFM. From the various stock factors of sprat and herring in the southern BPr, the biomass of sprat had the strongest positive relationships with the CF of prespawning salmon, and the total prey biomass with YSFM. It is concluded that the ample but unbalanced food resources for salmon in the BPr, primarily sprat, induce M74. By reducing the fishing pressure on cod {Cadus morhua) and by more effectively managing the sprat fishery in years when the cod stock is weak, the incidence of the M74 syndrome could be reduced and even prevented.
机译：波罗的海鲑鱼（Salmo salar）的M74综合征表现为卵黄囊死亡率增加（YSFM），损害了鲑鱼种群的繁殖。在M74高发期间，波罗的海鲑鱼的两个觅食区的波罗的海鲑的种群变化，其中波罗的海南部（BPr）是鲱鱼（Sprattus sprattus）是主要猎物种类，而波黑尼亚海的鲱鱼（Clupea harengus） ）是主要种类，已与鲑鱼生长和大小以及M74的发生有关进行了分析。产卵鲑鱼的高条件因子（CF> 1.05）预测了高YSFM。从南部BPr的鲱鱼和鲱鱼的各种存量因子来看，鲱鱼的生物量与产卵鲑鱼的CF呈最强的正相关，而与YSFM呈正相关。结论是BPr中鲑鱼（主要是西鲱）充足但不平衡的食物资源诱发了M74。通过减少对鳕鱼（Cadus morhua）的捕捞压力，并在鳕鱼种群稀少的年份中更有效地管理鲱鱼捕捞，可以减少甚至预防M74综合征的发生。

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