Estimating gillnet selectivity of Bluefish (Pomatomus saltatrix) by morphology

Akın Türker İlkyaz

doi:10.12714/egejfas.2018.35.1.14

EN TR

Estimating gillnet selectivity of Bluefish (Pomatomus saltatrix) by morphology

Abstract

The dataset of the study consists of total length, fork length, head girth, maximum girth and weight measurements of 136 bluefish. The relationship between the total length and fork length of the product was TL=1.1348×FL-0.8184; the relationship between the total length and weight was W=0.0103×L^2.97. The relationships between the total length and head girth and between the total length and maximum girth of the sample were linear: the relationship of the total length and head girth was G_gill=0.5092×TL-0.0874; the relationship of the total length and maximum girth was G_max=0.5989×TL-0.8540. The statistical relationship between length and girth was used to obtain a theoretical gillnet selectivity equation for the species. In conclusion, a relationship of S(l)=Φ[(C-G_gill)/0.4952]×[1-Φ((C-G_max)/0.4255)] was determined between the stretched size of the mesh used in bluefish fishing and the catch rate. Using this equation, and considering the legal length and length at first maturity, the minimum mesh size of the gillnet for sustainable fishery was determined.

Keywords

Direct estimation,Sechin method,length-girth relationship,length-length relationship,length-weight relationship

References

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Details

Primary Language

English

Subjects

-

Journal Section

Research Article

Authors

Akın Türker İlkyaz ^*
0000-0003-2650-3223
Türkiye

Publication Date

March 15, 2018

Submission Date

January 9, 2018

Acceptance Date

March 5, 2018

Published in Issue

Year 2018 Volume: 35 Number: 1

DOI

https://doi.org/10.12714/egejfas.2018.35.1.14

IZ

https://izlik.org/JA37BZ99EM

Cite

RIS / Bibtex

APA

İlkyaz, A. T. (2018). Estimating gillnet selectivity of Bluefish (Pomatomus saltatrix) by morphology. Ege Journal of Fisheries and Aquatic Sciences, 35(1), 89-94. https://doi.org/10.12714/egejfas.2018.35.1.14