Spatio-temporal patterns of abundance, biomass and length-weight relationship of white grouper, Epinephelus aeneus (Geoffroy Saint-Hilaire, 1817) (Pisces: Serranidae) in the Gulf of Antalya, Turkey (Levantine Sea)
Elif Özgür Özbek, Turhan Kebapçıoğlu, Mine Çardak
Antalya Metropolitan Municipality, Department of International Relations, Directorate of European Union Relations and Projects, Antalya, TURKEY
Faculty of Fisheries, Akdeniz University, 07058, Antalya, TURKEY
Faculty of Fisheries, Çanakkale Onsekiz Mart University, 17100, Çanakkale, TURKEY
The present paper reports the abundance and biomass of white grouper, Epinephelus aeneus (Geoffroy Saint-Hilaire, 1817), (Pisces: Serranidae) according to depth levels and seasons in the Gulf of Antalya, and the length-weight relationship parameters of 350 individuals. A total of 116 hauls were carried out, between August 2009 and April 2010, seasonally in the Gulf of Antalya, at six stations and six depth levels (25, 50, 75, 100, 150, 200 m), using a commercial bottom trawl. E. aeneus was sampled from 60 hauls and the frequency of occurrence was 51.72%. The overall average biomass of E. aeneus was 55.78 kg/km2 and the mean abundance was 60.60 ind./km2 .The smallest total length (TL) was 10 cm and the maximum TL was 101 cm. The mean TL was calculated as 34.99 cm. The general length-weight relationship was described by the equation: W = 0.040*L2.657 (r2: 0.958; p<0.001). Mean TL and weight of the specimens, b-value and mean biomass per abundance were highest in summer. The mean biomass per abundance was higher in Sts. D, E and F than Sts. A, B and C, located in the eastern part of the gulf. The mean abundance decreased as the depth level increased, however, mean biomass per abundance and mean TL and weight of the individuals increased constantly from 25 m to 100 m depth. The percentage of the mature fish decreased as the depth decreased.
Keywords: Epinephelus aeneus, white grouper, seasonal trawl survey, Antalya, Mediterranean Sea, length-weight relationship
Abdul Malak, D., Livingstone, S. R., Pollard, D., Polidoro, B. A., Cuttelod, A., Bariche, M., Bilecenoglu, M., Carpenter, K. E., Collette, B. B., Francour, P., Goren, M., Kara, M. H., Massutí, E., Papaconstantinou, C., Tunesi, L. (2011) Overview of the conservation status of the marine fishes of the Mediterranean Sea. IUCN, Gland, Switzerland and Malaga, Spain, 68 pp.
Anderson, M. J., Gorley, R. N., Clarke, K. R. (2008) PERMANOVA+ for PRIMER: Guide to software and statistical methods. PRIMER-E, Plymouth, UK, 214 pp.
Başusta, N., Erdem, Ü. (2000) A study on the pelagic and demersal fishes of Iskenderun Bay. Turk J. Zool. 24: 1-19.
Başusta, N., Kumlu, M., Gökçe, M. A., Göçer, M. (2002) Seasonal change and productivity index of species by trawled in Yumurtalık Bay. E.U. Journal of Fisheries and Aquatic Sciences 19 (1-2): 29-34 (in Turkish).
Bianchini, M. L., Giusto, G. B., Morara, U., Nardone, G. D., Sinacori, G., Ragonese, S. (2007) Trawl catches of groupers in the Strait of Sicily. In: 2nd Symposium on Mediterranean Groupers, May 10th – 13th 2007 (eds., P. Francour, J. Gratiot), Nice, pp. 35-36.
Bodilis, P., Ganteaume, A., Francour, P. (2003a) Presence of 1 year-old dusky groupers along the French Mediterranean coast. J. Fish Bio. 62: 242-246.
Bodilis, P., Ganteaume, A., Francour, P. (2003b) Recruitment of the dusky grouper (Epinephelus marginatus) in the north-western Mediterranean Sea. Cybium 27 (2): 123-129.
Bouain, A., Siau, Y. (1983) Observations on the female reproductive cycle and fecundity of three species of groupers (Epinephelus) from the Southeast Tunisian seashores. Marine Biology 73: 211-220.
Bouain, A., Siau, Y. Quignard, J. P. (1983) The groupers off the southeastern coasts of Tunisia, first part: systematic and ecobiology. Pêche Marit. 62 (1262): 276-280.
Bruslé, J. (1985) Exposé synoptique des données biologiques sur les mérous Epinephelus aeneus (Geoffroy Saint-Hilaire, 1809) et Epinephelus guaza (Linnaeus, 1758) de I’Océan Atlantique et de la Méditerranée. FAO Synop. Pêches 129: 64 pp.
Can, F., Başusta, N., Çekiç, M. (2002) Weight-length relationships for selected fish species of the small-scale fisheries off the south coast of Iskenderun Bay. Turk J. Vet. Anim. Sci. 26: 1181-1183.
Ceyhan, T., Akyol, O., Erdem, M. (2009) Length-weight relationships of fishes from Gökova Bay, Turkey (Aegean Sea). Turk J. Zool. 33: 69-72.
Çiçek, E., Avşar, D., Yeldan, H., Özütok, M. (2004) General characteristics of teleost fish fauna trawled from Babadıllimanı Bight (Mersin, Türkiye). E.U. TrJFAS (3-4): 223-227 (in Turkish).
Cury, P., Worms, J. (1982) Pêche, biologie et dynamique du thiof (Epinephelus aeneus E. Geoffroy Saint-Hilaire, 1817) sur les côtes sénégalaises. Doc. Sci. Cent. Rech. Océanogr. Dakar-Thiaroye (82): 88 pp.
Fiogbe, E. D. (2003) Morphometric relationships of commercially important fish species from Benin. In: Fish Biodiversity: Local Studies as Basis for Global Inferences (eds., M. L. D. Palomares, B. Samb, T. Diouf, J. M. Vakily, D. Pauly), ACP-EU Fish. Res. Rep. 14: 25-30.
Foulquié, M., Dupuy de la Grandrive, R. (2007) Abundance of juvenile dusky groupers Epinephelus marginatus (Lowe, 1834) in Syrian coastal waters, first observations and preliminary data. In: 2nd Symposium on Mediterranean Groupers, May 10th – 13th 2007 (eds., P. Francour, J. Gratiot), Nice, pp. 77.
Gökçe, M. A., Cengizler, İ., Özak, A. A. (2003) Gonad histology and spawning pattern of the white grouper (Epinephelus aeneus) from Iskenderun Bay (Turkey). Turk J. Vet. Anim. Sci. 27: 957-964 (in Turkish).
Gorshkov, S. (2010) Long-term plan for domestication of the white grouper (Epinephelus aeneus). Israel. Isr. J. Aquacult.- Bamidgeh 62 (4): 215-224.
GraphPad Software (2007) GraphPad Prism (Version 5). Available at www.graphpad.com. (accessed 05 Nov. 2011)
Gücü, A. C., Bingel, F. (1994) Trawlable species assemblages on the continental shelf on the North Eastern Levant Seas (Mediterranean) with an emphasis on Lessepsian migration. Acta Adriat. 35: 83-100.
Hassin, S., de Monbrison, D., Hanin, Y., Elizur, A., Zohar, Y., Popper, D. M. (1997) Domestication of the white grouper, Epinephelus aeneus 1. Growth and reproduction. Aquaculture 156 (3-4): 305-316.
Heemstra, P. C., Randall, J. E. (1993) FAO Species Catalogue. Vol. 16. Groupers of the World (Family Serranidae, Subfamily Epinephelinae). An annotated and illustrated catalogue of the grouper, rock cod, hind, coral grouper and lyretail species known to date. FAO Fisheries Synopsis, No. 125, Vol. 16. Rome, FAO, 382 pp.
JICA (1993) Report of demersal fisheries resource survey in the Republic of Turkey. JICA, AFF, JR (63), Ankara, 579 pp.
Koven W., Ben-Atia I., Lutzky S., Nixon O., Tandler A. (2007) Food particle size and photoperiod are critical factors in first feeding white grouper (Epinephelus aeneus) larvae. In: 2nd Symposium on Mediterranean Groupers, May 10th – 13th 2007 (eds., P. Francour, J. Gratiot), Nice, pp. 109-111.
Lakkis S., Sabour W. (2007) Distribution and ecology of groupers in SyroLebanese coastal waters: are they endangered or menaced ? In: 2nd Symposium on Mediterranean Groupers, May 10th – 13th 2007 (eds., P. Francour, J. Gratiot), Nice, pp. 117-119.
Magnússon, J., Magnússon, J. V. V. (1987) ICEIDA/Cape Verde Islands Fisheries Project, survey of demersal fish resources in the waters off Cape Verde Islands. IV. Report: summary of information on species. Icelandic International Development Agency/Marine Research Institute, 114 pp.
Marino, G., Azzurro, E., Massari, A., Finoia, M. G., Mandich, A. (2001) Reproduction in the dusky grouper from the southern Mediterranean. Journal of Fish Biology 58: 909-927.
Pauly, D. (1984) Fish population dynamics in tropical waters: a manual for use with programmable calculators. ICLARM Studies and Reviews 8. International Center for Living Aquatic Resources Management, Manila, Philippines, 325 pp.
Salihoğlu, İ., Mutlu, E. (2000) National marine research and monitoring programme, Mediterranean, Marmara Sea, Turkish Straits System, Black Sea and atmosphere sub-projects. 1995-1999 Period Synthesis Report. TUBITAK, Ankara, Turkey, 449 pp (in Turkish).
Sangun, L., Akamca, E., Akar, M. (2007) Weight-length relationships for 39 fish species from the north-eastern Mediterranean coast of Turkey. Turkish Journal of Fisheries and Aquatic Sciences 7: 37-40.
Sokal, R. R., Rohlf, F. J. (1987). Introduction to Biostatistics. 2nd Ed., Freeman, New York, 363 p.
Spare, P., Veneme, S. C. (1992) Introduction to tropical fish stock assessment (Part 1). FAO Fish. Tech. Pap., Rome.
StatSoft Inc. (2004) Statistica (data analysis software system), Version 7. Available at www.statsoft.com (accessed 29 Dec. 2011)
Thiao, D., Chaboud, C., Samba, A., Laloë, F., Cury, P. M. (2012) Economic dimension of the collapse of the ‘false cod’ Epinephelus aeneus in a context of ineffective management of the small-scale fisheries in Senegal. African J. Mar. Sci. 34 (3): 305-311.
Thierry, C., Sadovy, Y., Fennessy, S., Choat, J. H., Ferreira, B., Bertoncini, A. A., Craig, M. T., Rocha, L. (2008) Epinephelus aeneus. In: IUCN 2011, IUCN Red List of Threatened Species. Available at www.iucnredlist.org (accessed 04 Jan. 2012).
Ünal, V., Erdem, M., Göncüoğlu, H., Güçlüsoy, H., Tosunoğlu, Z. (2009) Management paradox of groupers (Epinephelinae) fishing in the Gökova Bay (Eastern Mediterranean), Turkey. JFAE. 7 (3/4): 904- 907.
Weatherley, A. H., Gill, H. S. (1987) The Biology of Fish Growth. Academic Press, London, 443 pp.
Zabala, M., Garcia-Rubies, A., Louisy, P., Sala, E. (1997) Spawning behaviour of the Mediterranean dusky grouper Epinephelus marginatus (Lowe, 1834) (Pisces, Serranidae) in the Medes Islands Marine Reserve (NW Mediterranean, Spain). Sci. Mar. 61 (1): 65-77.