Some biological aspects of atlantic stargazer Uranoscopus scaber linnaeus, 1758 (Family: uranoscopidae) in the egyptian mediterranean water

Atlantic stargazer (Uranoscopus scaber Linnaeus, 1758) fish samples were monthly collected during 2001-2002 from landing of bottom trawlers operating off Alexandria, Egypt. The results revealed that this species did not exceed five years of age and females were larger than males, reaching 30.0 cm and 26.0 cm, respectively. The study of length-weight relationship showed that no significant difference between males and females (P>0.05). Growth performance in length (Ф/) and weight (Ф) were found to be 2.62 and 1.05, respectively. The von Bertalanffy growth parameters were found to be L∞ =35.02 cm, K=0.3424 yr-1 and to=- 1.011 yr. The rates of total mortality (Z), natural mortality (M) and fishing mortality (F) were 0.901 yr-1, 0.554 yr-1 and 0.347 yr-1, respectively. This population is characterized by low exploitation rate (E= 0.229).

Anahtar Kelimeler:

yaş, ölüm oranı, Akdeniz, mevsimsel değişimler, büyüme performansı, büyüme, Mısır (ülke)

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Beverton, R.J.H. and Holt, S.J. 1957. On the dynamics of exploited fish populations. Fish. Invest., London, Ser., 2(19): 533.

Clark, F. 1928. The weight-length relationship of the California Sardine (Sardina caerulea) at San Pedro. Fish. Bulletin, 12. California.

Cushing, D.H. 1968. Fisheries biology. A study of population dynamic.Univ. Wisconsin Press, Madison, 200 pp.

Demestre, M., Sanchez, P. and Abello, P. 2000. Demersal fish assemblages and habitat characteristics on the continental shelf and upper slope of the north-western Mediterranean. J. Mar. Biol. Assoc., 80(6): 981- 988.

Dulcic, J. and Kraljevic, M. 1996. Weight-length relationship for 40 fish species in the eastern Adriatic (Croatian waters). Fish. Res., 28(3): 243-251.

El-Sayes, A., Abd El- Hameed, K., Faltas, S.N., Rizkalla, S.I. and Abdallah, A. 2001. Demmersal fish resources along the Mediterranean coast of Egypt. Technical report on demersal fisheries survey.Conf.of Nat. Inst. Oceanogr. & Fish. UAR March, Egypt, 62 pp.

Fulton, T. 1902. Rate of growth of sea fishes. Fish. Scotl. Sci. Invest. Rep., Scotland, 20 pp.

Gulland, J.A. 1964. Manual of methods of fish population analysis, FAO Fish. Techno. Pap., Rome, 40 pp.

Gulland, J.A. 1971. Science and fishery management. J. Cons. CIEM, 33(3): 471- 477.

Hureau, J. 1986. Fishes of the North - eastern Atlantic and the Mediterranean, In P.J.P. Whitehead, M.L. Bauchot, J.C. Hureau, J. Nielsen and E. Tortonese (Eds.) Fishes of the North-eastern Atlantic and the Mediterranean. UNESCO, Paris, 2: 955-956.

Kamel, M.S. 1993. Wind driven water movement of the upper layer of the eastern and western Mediterranean Sea. MSc. thesis, Alexandria: Alex., Univ., Fac. Sci., Egypt, 109 pp.

Lagler, K.F. 1956. Fresh Water Fishery Biology In: W.M.C. Brown (Eds.), Comp., Dubuque, Iowa, 421 pp.

Lee, R.M. 1920. A review of the methods of age and growth determination in fishes by means of scales. Fishery Invest., 4 (2): 1-32.

Moharrem, S.G. 2003. Reproductive biology of Uranoscopus scaber (Linnaeus, 1758), Family: Uranoscopidae in the Egyptian Mediterranean waters. Egypt. J. Aquat. Biol. & Fish., 7(2): 175-208.

Moreau, J., Bambino, C. and Pauly, D. 1986. Indices of overall growth performance of 100 Tilapia (Cichlidae) population. In: J.L. Maclean, L.B. Dizon and L.V. Hosillos (Eds.), The first Asian Fish, Fourum Manila Philippines, Asian Fish. Soc., 201-206.

Pauly, D. 1979. Gill size and temperature as governing factor. IN: Fish Growth: a Generalization of von Bertalanffy' s Theory of Growth. Ber. Inst. Meeresked Christian- Albrechts Univ. Kiel., 156 pp.

Pauly, D. 1983. Some simple methods for the assessment of tropical Fish stocks, FAO Fish., Tech. Pap., Rome: 52-234.

Pietch, T.W. 1989. Phylogenetic relationships of trachinoid fishes of family Uranoscopidae. Capeia: 253-303.

Ricker, W.E. 1975. Computation and interpretation of biological statistics of fish populations. Bull. Fish.Res. Bd. Can., 191: 382-391.

Sanz, A. 1985. Contribucion al estudio de la bilogia de Uranoscopus scaber Linnaeus, 1758 (Osteichthyes, Uranoscopidae) del Mediterraneo occidental. Inv. Pesq., 49 (1): 35-46.