Morphometric and proximate traits of three commercial fishes of different grades (Seriola dumerili, Pagrus pagrus and Liza ramada) in summer and winter, eastern Libya Mediterranean Sea

الملخص

Fish morphometric traits and proximate composition of flesh were established for Seriola dumerili (first class), Pagrus pagrus (second class) Liza ramada (third class) caught from Al-Hamama coast, eastern Libya Mediterranean Sea, during summer and winter 2015. Morphometric traits and condition factors, were established by species and seasons. Mean total length of S. dumerili was 32.31 and 36.26 cm in summer and winter consecutively (corresponding weights: 968.31 and 1180.79g), that of P. pagrus was 29.30 and 29.34cm (329.09 and 322.13g), and that of L. ramada was 26.12 and 15.75cm (288.17 and 131.27g). Differences between total length in summer and winter were not significant for S. dumerili and P. pagrus but significant for L. ramada. Morphometric traits and condition factors, were established by species and seasons. Most morphometric parameters correlated positively with each other. Some parameters correlated negatively. The length (TL)-weight (TW) relationships in summer and winter were TW=0.0385 TL ^2.8552, R²=0.9638 and TW=0.0029 TL ^3.5575, R²=0.9181 consecutively for S. dumerili, TW=0.0532 TL ^2.5513, R²=0.9793 and TW=0.114 TL ^2.3304, R²=0.9729 for P. Pagrus, and TW=0.3712 TL ^2.0169, R²=0.9476 and TW=0.2763 TL ^2.1804, R²=0.9539 for L. Ramada. Proximate traits of the three species in summer and winter were established. Species effect on all proximate traits (flesh moisture, protein, fats and ash) was significant. The season effect was only significant for moisture. The interaction between the species effect and the season effect on moisture was not significant but was significant for all the other traits. Protein, fats and ash correlated positively with each other and negatively with moisture.