A historical review of biological enhancement and fisheries for Iturup Island demonstrates that enhancement has significantly increased numbers of chum salmon while pink salmon are produced almost entirely naturally. Fourteen hatcheries currently produce and release chum salmon fry; four of these also generate pink salmon. Favourable natural conditions make the waters near Iturup Island one of the most productive marine areas in the Russian Far East. Efficient hatcheries combined with favourable conditions resulted in increases in chum salmon catches from less than 100 tonnes in the early 1990s to more than 20 000 tonnes in the late 2010s. Becoming better informed of factors controlling salmon production in the Kuril Islands should help scientists in other regions of the North Pacific understand what controls their own salmon populations.

中文翻译：

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提高伊图鲁普岛（俄罗斯库里尔群岛）鲑鱼生产的相对重要性

对伊图鲁普岛（Iturup Island）的生物增强和渔业的历史回顾表明，增强极大地增加了鲑鱼的数量，而粉红鲑鱼几乎完全是天然产生的。目前有14个孵化场生产和释放鲑鱼苗。其中四个还产生粉红色鲑鱼。良好的自然条件使伊图鲁普岛附近的水域成为俄罗斯远东地区生产力最高的海洋地区之一。高效的孵化场和有利的条件导致密宗鲑鱼的捕获量从1990年代初的不到100吨增加到2010年代后期的2万吨以上。更好地了解千岛群岛鲑鱼生产的控制因素，应有助于北太平洋其他地区的科学家了解什么因素控制着他们自己的鲑鱼种群。