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Title: 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
Authors: Makino, Hirona
Masuda, Reiji  kyouindb  KAKEN_id  orcid (unconfirmed)
Tanaka, Masaru
Author's alias: 益田, 玲爾
Keywords: Behavioral ontogeny
Critical period
Environmental enrichment
Habitat complexity
Oplegnathus fasciatus
Reward conditioning
Stock enhancement
Issue Date: Nov-2015
Publisher: Springer Japan
Journal title: Fisheries Science
Volume: 81
Issue: 6
Start page: 1035
End page: 1042
Abstract: 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 (50–65 days post-hatch) or 30 days (50–80 or 90–120 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 50–80 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.
Description: First online: 02 September 2015
Rights: The final publication is available at Springer via
The full-text file will be made open to the public on 02 September 2016 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
This is not the published version. Please cite only the published version.
DOI(Published Version): 10.1007/s12562-015-0917-0
Appears in Collections:Journal Articles

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