Study on the methods to mitigate the bycatch of juvenile bigeye tuna by introducing Double-FADs with light stimulus for tuna purse seine fishery in the Western and Central Pacific Ocean [EB WP 17] Taro Kawamoto ... [et al.]

By: Contributor(s): Material type: ArticleArticlePublication details: [Pohnpei, Federated States of Micronesia] Western and Central Pacific Fisheries Commission (WCPFC) 2012Description: 13 p. ill. 30 cmSubject(s): DDC classification:
  • 639.27783
Online resources: Summary: "In this paper, a research to mitigate bigeye tuna fishing mortality by using two separate FADs with underwater light stimulus (herein after referred to Double-FADs) was described. This purpose of this paper is to verify effects of decreasing bigeye tuna catch of Double-FADs as compared with common FADs (herein after referred to Normal-FADs). The total number of operation was forty eight (48) including 6-Double-FADs, 8-Normal-FADs and 34-Free school operations, which were conducted by a commercial vessel “Wakaba-Maru No.3” in November and December 2011 in exclusive economic zone of Papua New Guinea and Solomon Islands by using the assistance fund of the Fisheries Agency of Japan. Based on the onboard sampling data, the size proportion of Double-FADs is bigger than that of Normal- FADs in all species including skipjack, yellowfin and bigeye if we count number of fish which weight is bigger than 3.0kg on Normal-FADs compared with Double-FADs. The bycatch rate of bigeye tuna to total number with Double-FADs and Normal-FADs was 6.1% and 8.9% in number, and 7.2% and 14.2% in weight respectively. The number of bigeye tuna in catch of one (1) metric ton is estimated as 24 in Double-FADs and 45 in Normal-FADs. Although sample size and quality is not enough to reach conclusion and to apply appropriate statistical test, these results support that Double-FADs have some effect on reducing bigeye tuna bycatch as compared with Normal-FADs."
Item type: Meeting Paper
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SPC Special Collections SPC 639.277 83 WES 2012 Available

"WCPFC-SC8-2012/EB-WP-17"

Not published by the SPC

"In this paper, a research to mitigate bigeye tuna fishing mortality by using two separate FADs with underwater light stimulus (herein after referred to Double-FADs) was described. This purpose of this paper is to verify effects of decreasing bigeye tuna catch of Double-FADs as compared with common FADs (herein after referred to Normal-FADs). The total number of operation was forty eight (48) including 6-Double-FADs, 8-Normal-FADs and 34-Free school operations, which were conducted by a commercial vessel “Wakaba-Maru No.3” in November and December 2011 in exclusive economic zone of Papua New Guinea and Solomon Islands by using the assistance fund of the Fisheries Agency of Japan. Based on the onboard sampling data, the size proportion of Double-FADs is bigger than that of Normal- FADs in all species including skipjack, yellowfin and bigeye if we count number of fish which weight is bigger than 3.0kg on Normal-FADs compared with Double-FADs. The bycatch rate of bigeye tuna to total number with Double-FADs and Normal-FADs was 6.1% and 8.9% in number, and 7.2% and 14.2% in weight respectively. The number of bigeye tuna in catch of one (1) metric ton is estimated as 24 in Double-FADs and 45 in Normal-FADs. Although sample size and quality is not enough to reach conclusion and to apply appropriate statistical test, these results support that Double-FADs have some effect on reducing bigeye tuna bycatch as compared with Normal-FADs."