Gulf of Suez Feeding habits Diet compositionThe most common and commercial species of Family Sphyraenidae in the Gulf of Suez are Sphyraena chrysotaenia and S. flavicauda. A total of 865 individuals of S. chrysotaenia and 71 individuals of S. flavicauda were collected for food and feeding studies. The feeding intensity estimated as full stomach percent were represented by 37% and 59.2%, while the empty stomach were represented by 63% and 40.8% for S. chrysotaenia and S. flavicauda respectively. The relative length of gut indicated that both species were carnivorous as RLG= 0.29 and 0.15 for S. chrysotaenia and S. flavicauda respectively. The fullness index for the two species showed seasonal variations, as the highest fullness percent were recorded during winter, where the lowest fullness percent was observed during spring for both species. The most important food items for S. chrysotenia were fish with IRI% of 16023.6 followed by crustaceans with IRI% of 1452.36. The most important food items for S. flavicauda were crustaceans followed by fishes then mollusks, where IRI% were 1482, 1429 and 910 respectively. The prey sizes have a positive relationship with length of fish for both species.
A ge, growth and reproduction atSaurida undosquamis collected from Attaka fishing port from October 2004 to May 2005 was studied by examining 390 specimens caught by trawlers in Suez Gulf waters. The total length of males ranged between 9.5 cm to 29.8 cm. The length (L) -weight (W) relationship was estimated as W = 0.0042*3.1315. The age data derived from the length frequency data analyzed using the FISAT soft ware were used to calculate the growth parameters of the von Bertalanffy equation (1938). The estimated parameters were L^ = 31.03 cm, K = 0.44 and t = -1,059. The maximum age was 5 years. The 2-year age group was dominant in the catch. Macroscopic appearance of the testes demonstrated seven stages of maturity as virgin, maturing virgin , developing, developed, gravid, spawning and spent. Males recorded first sexual maturity at a total length 17.4 cm. Gonadosomatic index illustrated that this fish have prolonged spawning season nearly all the year round with main peak in May (2.6). The annual rates of total, natural and fishing mortality were calculated as 1.59, 1.32 and 0.27year" 1 respectively. Exploitation rate E was estimated as 0.83. The relative yield per recruit was estimated using the parameters obtained for male. The results suggest that the present level of fishing and natural mortality are much higher than that gives the maximum yield per recruit.
This work is the first histological description of gonad maturation of Sepia savignyi and the beginning of future research on its basic biology. A total of 452 samples, ranged in dorsal mantle length from 3.9 to 29 cm with average 16.35 + 1.50 and total weight ranged from 19 to 1826.8 gm, with average 606.79 + 110.7, of which 269, female and 183 male were examined between September 2014 to May 2015 obtained from the Gulf of Suez, Egypt. The size at first sexual maturity (DML 50) was 11.9 and 8.4 cm for female and male, respectively. The Gonadosomatic indices show that the females and males have two peaks in the year-round spawning period the first is in December (4.1 %) and (2.4%) and the second is in April (3.5%) and (2.2%) for female and male, respectively. Five stages of gonad maturation were established for the female and male, namely immature (I), maturing (II), mature (III), spawning (IV) and spent (V) based on macroscopic examination. Histological examination showed that each ovary and testis had various stages of oocyte and spermatocytes. Oogenesis of oocyte demonstrated seven stages of maturity in females as oogonia, early primary oocyte, late primary oocyte, previtellogenic oocyte, vitellogenic Oocyte, advanced vitellogenic oocyte and ripe oocytes. Spermatogenesis of testes divided into spermatogonia, primary and secondary spermatocytes, spermatid and spermatozoa.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.