鮭魚迴游
鮭魚會從海洋中迴游到出生河流的上游產卵。產卵之後,部分的鮭魚,如大西洋鮭和太平洋鮭,將會死去[1],完成生命的循環。一年一度的鮭魚洄遊發生在秋季(九月至十一月)。作為北美的關鍵物種,迴游的鮭魚會吸引灰熊、禿鷲等動物捕食。[2]
鮭魚在河流度過幼年期,成魚前往大洋(太平洋或大西洋),性成熟後返回河流,一般是它們出生的那條河流。絕大多數鮭魚都會迴游。但19世紀早期鮭魚引入南半球之後,並未產生迴游產卵的習慣。[3]
參考文獻
- Atlantic salmon, Scottish Natural Heritage. Retrieved 25 January 2018.
- . Western Fisheries Research Center. U.S. Geological Survey.
- Walrond C (2010) Trout and salmon – Chinook salmon Te Ara - the Encyclopedia of New Zealand. Updated 9 September 2010.
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