Dilek UÇKUN, Sencer AKALIN, Melahat TOĞULGA

İzmir Körfezi' nde hamsi (Engraulis encrasicolus L., 1758)' nin yaş ve büyüme özellikleri üzerine araştırmalar

Bu araştırmada, Ocak 1997-Aralık 1997 tarihleri arasında İzmir Korfezi'nden gırgır tekneleriyle avlanan balıkçılardan temin edilen 1161 adet hamsi (Engraulis encrasicolus, L, 1758) bireyi incelenmiştir. Örneklerin çatal boyları 6.2-14.0 cm ile ağırlıkları 1.46-22.47 g arasında değişmiştir. Dişiıerkek oranı 1:0.33 ve maksimum yaş III olarak tespit edilmiştir. En fazla bireye I yaş grubunda rastlanmıştır. Tüm bireyler için boy ve ağırlığa göre von Bertalanffy büyüme denklemleri $L_t=14.93(1-e-^{-0.628(t-0710)})$ $W_t=26.17 (1-e^{-0.628(t-0.710)})^{3.130}$ olarak bulunmuştur. Boy-ağırlık ilişkisi denklemi $W=0.0057*L^{3130}$ olarak hesaplanmıştır. Kondisyon faktörü değerleri dişi bireylerde 0.449-0.839, erkek bireylerde ise 0.550-0.864 arasında tespit edilmiştir.

Anahtar Kelimeler:

yaş, hamsi, Türkiye, biyolojik gelişim, büyüme performansı

Investigations of the age and growth of anchovy (Engraulis encrasicolus L., 1758) in İzmir Bay

Investigations of the age and growth of Anchovy (Engraulis encrasicolus L, 1758) in Izmir Bay. In this study, a total of 1161 anchovy (Engraulis encrasicolus, L, 1758), specimens collected from the purse-seine boats operating in İzmir Bay during the period from the January 1997-December 1997 were investigated. The fork length and the total weight of both sexes varied from 6.2-14.0 cm and from 1.46-22.47 g, respectively. Female:male ratio was 1:0.33 and maximum age group was determined as III. Most specimens belonged to age group I. The von Bertalanffy's growth equations in length and weight were $L_t=14.93(1-e-^{-0.628(t-0710)})$ and $W_t=26.17 (1-e^{-0.628(t-0.710)})^{3.130}$ for all specimens. Length-weight relationship equation were estimated as $W=0.0057*L^{3130}$. Condition factors were determined between 0.449 and 0.839 for females, from 0.550-0.864 for males.

Keywords:

age, anchovies, Turkey, biological development, growth performance,

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Anonymous, 2002. Fishery Statistics 2002, Turkish Prime Minister State Institute of Statistics, Ankara.

Basilone, G. C. Guisande, B. Patti, S. Mazzola, A. Cuttitta, A. Bonanno, A. Kallianiotis, 2004. Linking habitat conditions and growth in the European anchovy (Engraulis encrasicolus). Fisheries Research, 68,9-19.

Bellido, J.M., G.J. Pierce, J.L. Romero, M. Millan, 2000. Use of frequency analysis methods to estimate growth of anchovy (Engraulis encrasicolus L. 1758) in the Gulf of Cadiz (SW Spain). Fisheries Research, 48,107- 115.

Bouaziz, A., A. Bennoui, 2004. Etat Sexploitation de L'anchois Engraulis encrasicolus (Linne, 1758) dans la Baie D'Alger. Rapp. Comm. int. Mer Medit., 37,318.

Erkoyuncu, İ. and E. Özdamar, 1989. Estimation of the age, size and sex composition and growth parameters of anchovy Engraulis encrasicolus (L) in the Black Sea. Fisheries Research, 7,241-247.

Gayanilo, Jr., F.C., P. Sparre, and D. Pauly, 1994. The FAO-ICLARM Stock Assesment Tools (FİSAT) User's Guide. FAO Computerized Information Series, Fisheries. No. 1048.

Gibson, R. and I.A. Ezzi, 1980. The biology of the scaldfish, Amoglosus laterna (WALBAUM) on the west coast of Scotland. J. Fish Biol. (17):5, pp. 565-575.

Mater, S. 1979. Investigations on Morphology, Abundance, Distribution and Mortality of Pelagic Eggs and Larvae of Anchovy [Engraulis encrasicolus, L.) in İzmir Gulf (Turkey). Rapp. Comm. Int. Mer. Medit., 25/26,10.

Özdamar, E., K. Kihara, İ. Erkoyuncu, 1991. Some biological characteristics of European anchovy Engraulis encrasicolus, L. in the Black Sea. Journal fo the Tokyo University of Fisheries, Vol. 78, No. 1, p. 57-64.

Pertierra, J.P. 1987. Crecimiento del boqueron (Engraulis encrasicolus, L. 1758) (Pisces, Engraulidae) de la costa catalana (Mediterraneo noroccidental). Inv. Pesq. 51 (2), pags. 263-275.

Pertierra, J.P. 1995. A study of the population dynamics of the Northwestem Mediterranean anchovy (Engraulis encrasicolus) Using LCA (Length Cohort Analysis) Rapp. Comm. int. Mer Medit., 34, p.

Pauly, D. 1980. On the Relationships between Natural Mortality, Growth Parameters And Mean Environmental Temperature in 175 Fish Stocks, J. Cons. Int. Explor. Mer., 39(2): 175-192.

Ricker, W.E. 1979. Growth Rates and Models, in Fish Physiology (Har, W.S., Randall, D.J. and Brett, J.R., eds.), Vol.VIII, Bioenergitics and Growth, Academic Press, pp. 677-743.

Sinovcic, G. 1998. The population dynamics of the juvenile anchovy, Engraulis encrasicolus (L), under the Estuarine conditions (Novigrad . Sea-Central Eastern Adriatic). CIHEAM-IAMZ, p. 273-282.

Sinovcic, G. 2000. Anchovy, Engraulis encrasicolus (Linnaeus, 1758): biology, population dynamics and fisheries case study. ACTA ADRIAT. 41(1):3-53.

Sümbüloğlu, K. ve V. Sümbüloğlu, 1997. Biyoistatistik. Hatipoğlu Yayınevi, 7. baskı, Ankara, 269 sayfa.

Sparre, P., E. Ursin, S.C. Venema, 1989. Introduction to tropical fish stock assesment. Part 1-Manual. FAO Fish. Tech. Pap. No: 306/1,1-163.

Unsal, N. 1989. A study on age-length-weight relationship and determination of the smallest cathcing size of anchovy Engraulis encrasicolus (L.) in the Black Sea. İstanbul Üniversitesi, Su Ürünleri Dergisi. 3,1-2:17-28.