NDLI: Effects of fish size and size-grading on cannibalistic mortality in hatchery-reared orange-spotted grouper Epinephelus coioides juveniles

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Effects of fish size and size-grading on cannibalistic mortality in hatchery-reared orange-spotted grouper Epinephelus coioides juveniles

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Effects of fish size and size-grading on cannibalistic mortality in hatchery-reared orange-spotted grouper Epinephelus coioides juveniles

Content Provider	Springer Nature Link
Author	Takeshita, Akira Soyano, Kiyoshi
Copyright Year	2009
Abstract	Characteristics and frequency of cannibalism were investigated in the juvenile orange-spotted grouper Epinephelus coioides in order to obtain information to reduce mortality and, therefore, improve the seed production and culture of this species. In the present study, cannibalism was classified into three types: C-1: prey nipped in the head or body, C-2: prey swallowed whole, head first, and C-3: predator suffocated to death with the prey in its mouth. As size-grading is widely known to minimize fish cannibalism, experiments were also conducted on 30-, 40-, and 50-mm-TL size groups of the fish. In the results of both groups that had and had not been size-graded, cannibalism was more prevalent in the 30-mm group than in >40-mm groups. Size-grading demonstrated a tendency to minimize mortality in >40-mm groups, whereas there was no effect in fish of the 30-mm group. These results suggest that dominant juvenile grouper attack subordinates regardless of their size differences, and the size-graded technique is therefore ineffective in reducing cannibalism in the 30-mm group.
Starting Page	1253
Ending Page	1258
Page Count	6
File Format	PDF
ISSN	09199268
Journal	Fisheries Science
Volume Number	75
Issue Number	5
e-ISSN	14442906
Language	English
Publisher	Springer Japan
Publisher Date	2009-07-17
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cannibalism Epinephelus coioides Size-grading Food Science Freshwater & Marine Ecology Fish & Wildlife Biology & Management
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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Effects of fish size and size-grading on cannibalistic mortality in hatchery-reared orange-spotted grouper Epinephelus coioides juveniles

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