دراسة المحتوى الغذائي و نشاط التغذية  لنوعين من أسماك الصاورو Trachurus trachurus (Linneaus,758) و Trachurus mediterraneus (Steindachner, 1868) في جنوب البحر المتوسط (الساحل الليبي الغربي).

Hala M. Alaswad

doi:10.59743/jmset.v7i2.4

Authors

Hala M. Alaswad Department of Aquaculture, Faculty of Agriculture, University of Tripoli, Tripoli, Libya.

DOI:

https://doi.org/10.59743/jmset.v7i2.4

Keywords:

T. mediterraneus, T. trachurus, relative importance index, emptying coefficient

Abstract

The goal of the present study is to investigate the diet composition and seasonal variation in prey items of two species of mackerel, for that purpose 235 samples were collected from the western coast of Libya from December 2017 to July 2019. The two species include 128 specimens from Trachurus trachurus and 107 from Trachurus mediterraneus. T. trachurus feeds on crustaceans Shrimp, Isopoda, Megalops larvae, and Polychaeta, while T. mditerraneus feeds on Teleostei, crustaceans, and megalopa larvae. The main foods of both species were Crustaceans and the occasional food are Polychaeta worms; also feeding activity and food type are affected by the change of season.

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