海洋环境是影响中上层鱼类资源的重要因子之一。

Marine environmental variable is one of the important factors affecting fishery resources and fishing ground for pelagic fishes.

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现在，共有152家个人和公司拥有对鳕鱼、马胶鱼、大型中上层鱼类、蟹类和螯虾类的捕捞许可权。

Currently a total of 152 individuals and companies hold fishing rights for hake, monkfish, horse mackerel, large pelagics, crab and rock lobster.

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例如，内海鱼类有良好的色彩视觉，而外海中上层鱼类则有有限的色彩视觉只能检测少数黑色和白色以外的其他颜色。

For example, inshore fish have good color vision, whereas offshore pelagic fish have limited color vision and detect only a few if any colors other than black and white.

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例如，内海鱼类有良好的色彩视觉，而外海中上层鱼类则有有限的色彩视觉只能检测少数黑色和白色以外的其他颜色。

For example, inshore fish have good color vision, whereas offshore pelagic fish have limited color vision and detect only a few if any colors other than black and white.

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