Magdy M. EL HALFAWY, M. Amal AMİN, M. Amal RAMADAN

Growth and reproduction of female brushtooth lizardfish Saurida undosquamis (Richardson) from the Gulf of Suez,Egypt

Süveyş Körfezi’nde (Mısır) lokum balığı Saurida undosquamis (Richardson) dişi bireylerinin büyüme ve üremesi. Ekim 2004’ten Mayıs 2005’e kadar Süveyş Körfezinden trol ile yakalanan ve Attaka balıkçı limanından çıkarılan 434 Lokum balığının (Saurida undosquamis) ilk olgunluk boyu, yumurtlama dönemi, büyüme parametreleri ve yaş kompozisyonu ele alındı. Dişilerin total uzunluğu 13.2 ile 34 cm arasında değişim göstermiştir. Boy (L)-Ağırlık (W) arasındaki ilişki W=0.0038 L3.1666 olarak tespit edildi. FISAT programı ile analizi yapılan boy frekanslarından elde edilen yaş verileri von Bertalanffy denkleminin (1938) büyüme parametrelerinin tahmininde kullanıldı. Tahmin edilen parametreler L∞=35.56cm, K=0.26 ve t0=-1.059 idi. Saurida undosquamis dişileri için maksimum yaş 6 olarak tespit edilmiştir. Yakalananlar içinde 3 yaş grubu dominant olarak gözlenmiştir. Ovaryum, gonadosomatik indeks ve oosit çapının makroskobik görüntülerinden Saurida undosquamis’in yumurtlama mevsiminin Aralık ve Mayıs’ta iki dönemlik artış göstermesiyle birlikte tüm yıl boyunca sürdüğü anlaşıldı. Gonadların, bakir, olgun bakir, gelişmekte olan, gelişmiş, yumurtlayan ve yumurtalarını dökmüş gibi dış görünüşe dayanan yedi aşaması belirlendi. Dişilerin 18.1cm’lik total boyda olgunluğa ulaşmığı tespit edilmiştir. Total, doğal ve avcılıktan kaynaklanan ölümlerinin yıllık değerleri sırasıyla 1.22, 0.99 ve 0.23 yıl-1 olarak hesaplandı. Tüketim oranı (E) 0.81 olarak tahmin edildi. Her toplamadaki ilgili verim ve biomas analizleri Süveyş körfezindeki Saurida undosquamis dişi stoklarının tüketilmiş oldugu bulunmuştur. Bireylerin en azından %50’sinin toplanma ve yumurtlatma için korunmasını garantilemek amacıyla, şu anki kullanım oranının yaklaşık %53.1’e kadar azaltılması gerekmektedir.

Anahtar Kelimeler:

biyolojik gelişim, üreme özellikleri, eşeysel olgunluk, Mısır (ülke), büyüme, olgunluk, yaş, döllenme gücü

Süveyş Körfezi'nde (Mısır) lokum balığı Saurida undosquamis (Richardson) dişi breylerinin büyüme ve üremesi

The age composition, growth parameters, spawning season, length at first sexual maturity of the common lizard fish Saurida undosquamis was described based on 434 specimen caught by trawls in Suez Gulf waters and landed in Attaka fishing port from October 2004 to May 2005. The total length of females ranged from13.3 cm to 34 cm. The length (L) – weight (W) relationships were estimated as W = 0.003 8 L3.1666. The age data derived from the length frequency data analyzed using the FISAT soft ware were used to estimate the growth parameters of the von Bertalanffy equation (1938). The estimated parameters were L>= 35.56 cm, K = 0.26 and to = -1.059. The maximum age was 6 for Saurida undosquamis females. The 3-year age group was dominant in the catch. Macroscopic appearance of the ovary, gonado somatic index and oocyte diameter frequency distribution suggested that the spawning season of Saurida undosquamis is prolonged season nearly all the year round with two peaks in December and May. Seven stages of maturity were determined based on external appearance as virgin, maturity virgin, developing, developed, spawning and spent. Females matured at a total length of 18.1 cm. The annual rates of total, natural and fishing mortality were calculated as 1.22, 0.99 and 0.23 year-1 respectively. Exploitation rate E was estimated as 0.81. The relative yield per recruit and relative biomass per recruit analysis showed that the stock of Saurida undosquamis females in the Suez Gulf is overexploited. To insure that at least 50% of the individuals can be maintained for spawning and recruitment, the present level of exploitation rate should be reduced by about 53.1%.

Keywords:

biological development, reproductive traits, sexual maturity, Egypt, growth, maturity, age, fecundity,

PDF

___

Abdallah, M. 2002. Length-weight relationship of fishes caught by trawl off Alexandria, Egypt. Naga ICLARM Q. 25(1):19-20.

Battacharya, C. G. 1967. Asimple method of resolution of a distribution into Gaussian components. Biometrics,23:115-135.

Bertalanffy, L. V. 1938. "A quantitative theory of organic growth (Inquiries on growth Laws. 2 ). " Hum. Biol., 10: 181-213.

Beverton, R. J. H. and S. J. Holt. 1959. A review of the life spans and mortality rates of fish in nature and their relation to growth and other physiological characteristics. Ciba Foundation colloqia on Ageing.5:142-180.

Beverton, R. J. H. and S. J. Holt. 1966. Manual of methods for fish stock assessment. Part 2.Tables of yield functions". FAO Fish. Tech. Pap., (38) Rev, 1; 67 pp.

Boonwanich, T. 1991. Population dynamics of Saurida elongata and S. undosquamis (Synodontidae) in the southern Gulf of Thailand. Fishbyte 9(1):23-27.

Budnichenko V. A. and O. S. Dimitrova. 1979. Reproductive biology of Saurida undosquamis and Saurida tumbil (pisces, synodontidae) in the Arabian Sea. J. Ichthyol. 19 (5): 860-867.

El-Ganainy, A. A.. 1992. Biological studies on lizard fishes Saurida imdosquamis (Pisces, Synodontidae) from the Gulf of Suez. M. Sc. Thesis, Fuclty Sci., Ain Shams University, Cairo. Egypt.

El-Ganainy, A. A. 1997. Population Dynamics of Lizard Fishes (Synodontidae) from the Red Sea. Ph.D. Thesis, Faculty Science, Suez Canal University, Ismailia. Egypt.

El-Ganainy, A. A. 2002. "Assessment of the lizard fish Saurida undosquamis (Richardson) fishery in the Gulf of Suez, Red Sea. " Bull. Nat. Inst. Oceanogr. Fish., ARE. 28.

El-Ganainy, A. A. 2004. " Biological characteristic and fishery assessment of the lizard fishes Saurida imdosquamis from the Red Sea,Egypt".Egypt.J.Aquatic. boil.&Fish.,vol.8,No.2:93-113.

El-Greisy Z. A. 2005. Reproductive Biology and Histology of Female Brushtooth Lizardfish Saurida undosquamis (Richardson), Family: Synodontidae, from the Mediterranean Coast of Egypt. Egyptian J. of Aquatic Research Vol.. 31, No. I

Erzini, K. 1991. A compilation of data on Variability in length-age in marine fishes". Working paper 77. Fisheries stock Ssimnort

Faltas, S. N. 1993. Studies on the fishery biology of lizard fish (Family: Synodontidae) in the Egyptian Mediterranean waters. Ph.D. Thesis, Faculty of Science, Alexandria University, Egypt.

Federizon, R. 1993. Using vital statistics and survey catch composition data for tropical multispecies fish stock assessment: application to the demersal resources of the central Philippines. Alfred-Wegener-Institut für Polar- und Meeresforschung, Bremerhaven. 201 p. Ph.D. dissertation

Gayanilo, J., F. C. P. Sparre and D. Pauly. 1997. The FAO-ICLARM Stock Assessment Tools (FISAT) "FAO Computerized Information Series (Fisheries).No.8.Rome, FAO.

Golani, D. 1993. The biology of the Red Sea migrant, Saurida undosquamis in the Mediterranean and comparison with the indigenous confamilial Synodus saurus (Teleostei: Synodontidae). Hydrobiologia 271(2):109-117.t

Gulland, J. A. 1971. The Fish Resources of the Ocean. West Byfleet, Surrey, Fishing News (Books), Ltd., for FAO: 255pp.

Gulland J. A. and S. l. Holt. 1959. Estimation of growth parameters for data at unequal time intervals.J. Cons. Perm. Int. Explor Mer,25 (1):47-49.

Ismen, A. 2003. Maturity and fecundity of lizard fish (Saurida undosquamis Richardson, 1848) in Iskenderun Bay (Eastern Mediterranean). Turk. J. Zool., 27: 231-238.

Latife, A. A. and T. S. Shenouda. 1973. Studies on Saurida undosquamis (Richardson) from the Gulf of Suez. Monthly peculiarities of gonads. Bull. Inst. Oceanogr. Fish., Egypt. 3: 295-335.

Letourneur, Y., M. Kulbicki and P. Labrosse. 1998. Length-weight relationships of fish from coral reefs and lagoons of New Caledonia, southwestern Pacific Ocean: an update. Naga ICLARM Q. 21(4):39-46.

Pauly, D. 1983a. Length-converted catch curves. A powerful tool for fisheries research in the tropics. Part 1. ICLARM Fishbyte, 1(2): 9-13.

Pauly, D. 1983b. A selection of simple methods for the assessment of tropical fish stocks. FAO Fish. Circ. (729): 54 pp.

Pauly, D. 1984a. Length-converted catch curves. A powerful tool for fisheries research in the tropics. (part II) ". ICLARM Fishbyte, 2 (1): 17-19.

Pauly, D. 1984b. Length-converted catch curves. A powerful tool for fisheries research in the tropics. (III: conclusion) ". ICLARM Fishbyte, 2 (3): 9-10.

Pauly, D. and J. L. Munro. 1984. Once more on the comparison of growth in fish and invertebrates. ICLARM Fishbyte, 2 (1): 21

Pauly, D. and M. L. Soriano 1986. Some practical extensions to Beverton and Holt's relative yield-per-recruit model, p. 491-496. In J. L. Maclean, L. B. Dizon and L. V. Hosillo (eds.). The First Asian Fisheries Forum. Asian Fisheries Society, Manila, Philippines.

Pauly, D. and F. C. Gayanilo. 1996. Estimating the parameters of length-weight relationships from length-frequency samples and their weights. p. 136". In D. Pauly and P. Martosubroto (eds.) Baseline studies of biodiversity: the fish resource of western Indonesia. ICLARM Stud. Rev. 23.

Pitt T. K. 1970. Distribution, abundance and spawning of yellowtail flounder, Limanda ferruginea, in the New Foundland area of the North West Atlantic. J. Fish. Res. Bd. Canada, 27(12): 2261-2271.

Ramadan, A. M. 1995. Reproduction studies on Lizard fish, Saurida undosquamis. M. Sc., Thesis, Faculty of Scince. Suez Canal University.

Rao K.V. S. 1983. Maturation and spawning of lizard fishes (Saurida spp.) from North Western part of Bay of Bengal. Indian J. Fish, 30(1): 27-45.

Sanders, M. J., S. M. Kedidi and M.R., Hegazy 1984. Stock assessment for the brushtooth lizardfish (Saurida undosquamis) caught by trawl in the Gulf of suez. Project for the Development of Fisheries in the areas of the Red Sea and Gulf of Aden", FAO/UNDP RAB/83/023/05. Cairo. 28 p. (mimeo)

Siripakhavanich, S. 1990. A study on population dynamics of the brushtooth lizard fish, Saurida undosquamis (Richardson) off the upper western coast in the Gulf of Thailand. " Faculty of Fisheries, Kasetsart University, Thailand. 77 p.

Sousa, M. I. 1992. Seasonal growth of five commercially important fishes at Sofala Bank, Mozambique". Rev. Invest. Pesq. (Maputo) 27:79-97.

Xu, G., W. Zheng and O. Huang. 1994. Atlas of the fishes and their biology in Daya Bay. Anhui Scientific and Technical Publishers, P.R.O.C. 311 pp.