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Size selectivity of a trammel net for oval squid Sepioteuthis lessoniana
- Source :
- Fisheries science, 70 (6). pp. 945-951.
- Publication Year :
- 2004
- Publisher :
- Japanese Society of Fisheries Science, 2004.
-
Abstract
- The size selectivity of a trammel net for herded oval squid Sepioteuthis lessoniana in Tateyama Bay, Chiba Prefecture, was estimated by comparison between the mantle length frequency distributions of oval squid caught by a trammel net and by a set net. The measured mesh sizes of the inner net of the trammel net and of the final section of the set net were 85.3 and 11.3 mm, respectively. In the trammel net fishery where oval squid are herded into the net, most of the oval squid are caught in the bag-shaped inner net. Hence, the logistic function was employed for the size selectivity curve of the trammel net. The ‘share each length's catch total’ (SELECT) model was implemented for the estimation of the selectivity curve. The size selectivity r(l) of the trammel net for the oval squid was expressed as a logistic function of the mantle length l: r(l) = exp(−18.57 + 0.88 l)/[1 + exp(−18.57 + 0.88 l)]. From these logistic parameter estimates, the 50% selection mantle length and selection range (L75–L25) were calculated as 21.07 and 2.49 cm, respectively. The selection probability of oval squid whose mantle girth was equivalent to the mesh perimeter of the inner net was 0.09. Accordingly, oval squid of a girth smaller than the mesh perimeter were likely to pass through the mesh to escape from the net.
- Subjects :
- 0106 biological sciences
biology
010604 marine biology & hydrobiology
Length frequency
Geometry
04 agricultural and veterinary sciences
Aquatic Science
biology.organism_classification
01 natural sciences
Fishery
Sepioteuthis
Perimeter
Size selectivity
040102 fisheries
0401 agriculture, forestry, and fisheries
14. Life underwater
Mathematics
Subjects
Details
- ISSN :
- 14442906 and 09199268
- Volume :
- 70
- Database :
- OpenAIRE
- Journal :
- Fisheries Science
- Accession number :
- edsair.doi.dedup.....08647bbedbf4efb118e91c49df417885