Square-mesh codend circumference and selectivity
نویسندگان
چکیده
منابع مشابه
Effect of Codend Circumference on the Size Selection of Square-Mesh Codends in Trawl Fisheries
It is well established that increasing mesh number in the circumference of a diamond-mesh trawl codend can reduce size selection for round fish, whereas selection for flat fish species is unaffected. This effect has also been documented in Mediterranean trawl fisheries. In contrast, no information is available with regard to the effect of increasing mesh number in the circumference of square-me...
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In the present study, we compared the size selectivity of the 14 mm (knot-to-knot) diamond-shaped codend (14D), presently used in Hellenic waters, with those of 20 mm square-shaped (20S) and 20 mm diamond-shaped (20D) codends for four commercially important demersal species (Merluccius merluccius, Micromesistius poutassou, Trisopterus minutus capelanus and Lepidorhombus boscii). Codend selectiv...
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Beach seine is fishing gears that occupy all depths of water from surface to bed by non-gillnet net. Increasing non-standard catches caused this survive was done to standardization of the beach seine mesh size. The research was started from winter of 2017 to spring of 2017, performing 73 hauling with four mesh sizes of 26, 28, 30 and 33 mm (knot to knot) in the bag area of the beach seine in ...
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Given a graph G, its partially square graph G∗ is a graph obtained by adding an edge (u, v) for each pair u, v of vertices of G at distance 2 whenever the vertices u and v have a common neighbor x satisfying the condition NG(x) ⊆ NG[u] ∪ NG[v], where NG[x] = NG(x) ∪ {x}. In the case where G is a claw-free graph, G∗ is equal to G. We define σ◦ t = min{ ∑ x∈S dG(x) : S is an independent set in G ...
متن کاملMesh Selectivity of Net Pot for White-spotted Conger Eel Estimated from a Cover-net Fishing Experiment
This paper presents the mesh selectivity of a net pot for white-spotted conger eel Conger myriaster. A cover-net fishing experiment was carried out in October 1995 and 1996, using five mesh openings; 11.6, 13.6, 15.5, 18.1, and 21.0 mm with a cover-net of 10.8 mm mesh opening. Each mesh-size net pot had a slightly different mesh selectivity curve in terms of R(=G/P), girth ratio G to mesh perim...
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ژورنال
عنوان ژورنال: ICES Journal of Marine Science
سال: 2009
ISSN: 1095-9289,1054-3139
DOI: 10.1093/icesjms/fsp001