Environmental stimuli improve learning capability in striped knifejaw juveniles: the stage-specific effect of environmental enrichment and the comparison between wild and hatchery-reared fish

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• 作者：Hirona Makino ; Reiji Masuda ; Masaru Tanaka
• 关键词：Behavioral ontogeny ; Critical period ; Environmental enrichment ; Habitat complexity ; Oplegnathus fasciatus ; Reward conditioning ; Stock enhancement ; Y ; maze
• 刊名：Fisheries Science
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：81
• 期：6
• 页码：1035-1042
• 全文大小：537 KB
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• 作者单位：Hirona Makino (1) (3)
  Reiji Masuda (2)
  Masaru Tanaka (1) (4)
  
  1. Laboratory of Estuarine Ecology, Field Science Education and Research Center, Kyoto University, Sakyo, Kyoto, 606-8502, Japan
  3. Environmental Conservation Division, Toyama Prefectural Office, 1-7 Shin-Sougawa, Toyama, 930-8501, Japan
  2. Maizuru Fisheries Research Station, Field Science Education and Research Center, Kyoto University, Nagahama, Maizuru, Kyoto, 625-0086, Japan
  4. International Institute for Advanced Studies, 9-3 Kizugawadai, Kizugawa, Kyoto, 619-0225, Japan
  
• 刊物主题：Fish & Wildlife Biology & Management; Freshwater & Marine Ecology; Food Science;
• 出版者：Springer Japan
• ISSN：1444-2906

文摘

Hatchery-reared fish often show different behavioral traits from their wild counterparts, possibly due to the lack of environmental stimuli. Here, we aimed to reveal the stage-specific effect of environmental stimuli on the development of learning capability in striped knifejaw Oplegnathus fasciatus. The fish were raised for 15 days (50-5 days post-hatch) or 30 days (50-0 or 90-20 days post-hatch) in either conventional rearing tanks (control) or in a structurally enriched tank containing bricks, artificial sea grass, and plastic pipes (enriched environment), and were examined for learning capability using Y-maze reward conditioning. The learning capability of wild juveniles was also examined, and their scores were compared with those of hatchery-reared fish (which we previously reported). Only fish in the 50-0 days post-hatch enriched-rearing group showed significantly better scores than those in the control group, and wild fish performed better than hatchery-reared ones. The present results indicate that, although the learning capability of hatchery-reared fish is inferior to that of wild fish, exposure to a highly structured environment at an appropriate stage promotes the development of learning capability. Such environmental enrichment can potentially improve the viability of hatchery-reared fish when they are released into the wild. Keywords Behavioral ontogeny Critical period Environmental enrichment Habitat complexity Oplegnathus fasciatus Reward conditioning Stock enhancement Y-maze