Ahmet Mert ŞENBAHAR, Özlem GÜLEÇ ŞEN, Zafer TOSUNOĞLU, Okan ÖZAYDIN

Length-Weight Relationship of the Most Landed Pelagic Fish Species European Pilchard (Sardina pilchardus Walbaum, 1792) and European Anchovy (Engraulis encrasicolus Linnaeus, 1758) in the İzmir Bay (Aegean Sea, Turkey) Purse Seine Fishery

Length-weight relationships (LWR) of the most landed pelagic fish species Sardina pilchardus Walbaum, 1792 and Engraulis encrasicolus Linnaeus, 1758 in the Izmir Bay purse seine fishery were determined to reveal latest situation. Purse seine is a non-selective fishing gear compare to the other fishing gear such as gillnet or trammel net. For this reason, sampling all size individuals is very important to calculate mean length and other LWR parameters. In this study, seasonal LWR coefficient and minimum-maximum lengths were established as monthly basis. LWR of S. pilchardus and E. encrasicolus were W = 0.0059L2.7930 (r² = 0.94) and W = 0.0019L3.4207, (r² = 0.87), respectively. Growth type of the S. pilchardus was found negative allometric whereas E. encrasicolus was positive allometric. A decrease of the mean total length of S. pilchardus has been considerable variable from 1994 to 2014 in Izmir Bay but with this study, it is observed that mean length of the sardine found near of 2006 value related to seasonal fishing pressure.

Keywords:

Sardina pilchardus Engraulis encrasicolus, LWR, Izmir Bay, Purse seine fishery,

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Acarli, D., Kara, A. & Bayhan, B. (2014). Length-weight relations for 29 fish species from Homa Lagoon, Aegean Sea, Turkey. Acta Ichthyologica et Piscatoria, 44(3): 249-257. https://doi.org/10.3750/AIP2014.44.3.09
Avsar, D. (2016). Fisheries Biology and Population Dynamics (in Turkish). Ankara, Turkey: Akademisyen Publishing. 148 p.
Froese, R. & Pauly, D. (1998). FishBase 98: Concepts, Design and Data sources. 293 p
González Acosta, A. F., De La Cruz Agüero, G. & De La Cruz Agüero, J. (2004). Length-weight relationships of fish species caught in a mangrove swamp in the Gulf of California (Mexico). Journal of Applied Ichthyology, 20(2): 154-155. https://doi.org/10.1046/j.1439-0426.2003.00518.x
Handegard, N. O., Tenningen, M., Howarth, K., Anders, N., Rieucau, G. & Breen, M. (2017). Effects on schooling function in mackerel of sub-lethal capture related stressors: crowding and hypoxia. PLoS ONE, 12(12): e0190259. https://doi.org/10.1371/journal.pone. 0190259
Hoşsucu, H., Kara, A., Metin, C., Tosunoğlu, Z. & Ulaş, A. (1994). Purse seine fisheries in Aegean Region and catch effort of the purse seine vessels (in Turkish with English abstract). Ege Journal of Fisheries and Aquatic Sciences, 11: 17-32.
Ismen, A., Ozen, O., Altinagac, U., Ozekinci, U. & Ayaz, A. (2007). Weight-length relationships of 63 fish species in Saros Bay, Turkey. Journal of Applied Ichthyology, 23(6): 707-708. https://doi.org/10.1111/j.1439-0426.2007.00872.x
Karachle, P. K. & Stergiou, K. I. (2008). Length–length and length–weight relationships of several fish species from the North Aegean Sea (Greece). Journal of Biological Research-Thessaloniki, 10: 149-157.
Mendes, B., Fonseca, P. & Campos, A. (2004). Weight-length relationships for 46 fish species of the Portuguese west coast. Journal of Applied Ichthyology, 20(5): 355-361. https://doi.org/10.1111/j.1439-0426.2004.00559.x
Moutopoulos, D. K. & Stergiou, K. I. (2002). Length–weight and length–length relationships of fish species from the Aegean Sea (Greece). Journal of Applied Ichthyology, 18(3): 200-203. https://doi.org/10.1046/j.1439-0426.2002.00281.x
Mustač, B. & Sinovčić, G. (2010). Reproduction, length-weight relationship and condition of sardine, Sardina pilchardus (Walbaum, 1792), in the eastern Middle Adriatic Sea (Croatia). Periodicum Biologorum, 112(2): 133-138.
Oscoz, J., Campos, F. & Escala, M. C. (2005). Weight-length relationships of some fish species of the Iberian Peninsula. Journal of Applied Ichthyology, 21(1): 73-74. https://doi.org/10.1111/j.1439-0426.2004.00587.x
Özaydin, O. & Taskavak, E. (2006). Length-weight relationships for 47 fish species from Izmir Bay (eastern Aegean Sea, Turkey). Acta Adriatica, 47(2): 211-216.
Özbilgin, H., Eryaşar, A. R., Fakıoğlu, Y. E., Kalecik, E., Demir, O. & Saygu, İ. (2015). Reference list of the fisheries studies carried out in Turkish waters (in Turkish). Proceedings of the 18th National Fisheries Symposium, Izmir, Turkey. pp. 93.
Pešić, A., Đurović, M., Regner, S., Joksimović, A. & Simić, V. (2006). Length-weight relationship of juvenile sardine Sardina pilchardus (Walbaum, 1792) from Boka Kotorska Bay. Kragujevac Journal of Science, 28: 91-95.
Petrakis, G. & Stergiou, K. I. (1995). Weight-length relationships for 33 fish species in Greek waters. Fisheries Research, 21(3-4): 465-469. https://doi.org/10.1016/0165-7836(94)00294-7
Ricker, W. E. (1975). Computation and interpretation of biological statistics of fish populations. Bulletin of the Fisheries Research Board of Canada. Bulletin No. 191, Ottawa, Canada. 382p.
Sinovčić, G., Franičević, M., Zorica, B. & Čikeš‐Keč, V. (2004). Length-weight and length-length relationships for 10 pelagic fish species from the Adriatic Sea (Croatia). Journal of Applied Ichthyology, 20(2): 156-158. https://doi.org/10.1046/j.1439-0426.2003.00519.x
Sokal, R. R. & Rohlf, F. J. (1969). Biometry: The principles and practice of statistics in biological research. 3rd ed. San Francisco, CA, USA: W. H. Freeman and Company. 776p.
Sokal, R. R. & Rohlf, F. J. (1973). Introduction to Biostatistics. San Francisco, CA, USA: W. H. Freeman & Company Ltd. 368 p.
Sparre, P., Ursin, E. & Venema, S. C. (1989). Introduction to tropical fish stock assessment: Part I. Manual FAO Fisheries Technical Paper. No. 306. 1. Rev. 1 Rome, Italy: FAO. 376 p.
Sparre, P. & Venema, S. C. (1992). Introduction to tropical fish stock assessment: Part I. Manual FAO Fisheries Technical Paper. No. 306. 1. Rome, Italy: FAO. 337 p.
Tarkan, A. S., Gaygusuz, Ö., Acıpınar, H., Gürsoy, Ç. & Özuluğ, M. (2006). Length-weight relationship of fishes from the Marmara region (NW‐Turkey). Journal of Applied Ichthyology, 22(4): 271-273. https://doi.org/10.1111/j.1439-0426.2006.00711.x
Torres, M. A., Ramos, F. & Sobrino, I. (2012). Length–weight relationships of 76 fish species from the Gulf of Cadiz (SW Spain). Fisheries Research, 127-128: 171-175. https://doi.org/10.1016/j.fishres.2012.02.001
TurkStat. (2019). Fishery Statistics. Retrieved in December 28, 2019 from http://www.turkstat.gov.tr/
Veiga, P., Machado, D., Almeida, C., Bentes, L., Monteiro, P., Oliveira, F. & Gonçalves, J. M. S. (2009). Weight-length relationships for 54 species of the Arade estuary, southern Portugal. Journal of Applied Ichthyology, 25(4): 493-496. https://doi.org/10.1111/j.1439-0426.2009.01230.x
Watson, R., Revenga, C. & Kura, Y. (2006). Fishing gear associated with global marine catches: I. Database development. Fisheries Research, 79(1-2): 97-102. https://doi.org/10.1016/j.fishres.2006.01.010