Hostname: page-component-cd9895bd7-dk4vv Total loading time: 0 Render date: 2024-12-27T09:08:32.375Z Has data issue: false hasContentIssue false
  • English
  • Français

Estimates of cetacean by-catch in the turbot fishery on the Turkish Western Black Sea Coast in 2007 and 2008

Published online by Cambridge University Press:  01 February 2016

Arda M. Tonay
Arda M. Tonay*
Affiliation:
Faculty of Fisheries, Istanbul University, Ordu Cad. No. 200, Laleli, Istanbul, Turkey Turkish Marine Research Foundation, P.O. Box 10, Beykoz, Istanbul, Turkey
*
Correspondence should be addressed to:A.M. Tonay, Faculty of Fisheries, Istanbul University, Ordu Cad. No. 200, Laleli, Istanbul, Turkey email: atonay@istanbul.edu.tr
Get access Rights & Permissions [Opens in a new window]

Abstract

This is the first study estimating cetacean by-catch in the Turkish western Black Sea turbot fishery. One turbot fishing boat was observed during two fishing seasons, from April through July 2007 and April through mid-September 2008. During this time, 24 harbour porpoises and one bottlenose dolphin were caught in turbot trammel nets. The by-catch rate was found to be 0.18 for harbour porpoise and 0.01 for bottlenose dolphin individuals per kilometre in 2007, and 0.19 for harbour porpoise individuals in 2008. It is estimated that the total numbers of harbour porpoises killed in the Turkish western Black Sea during the legal fishing period (April and July) were 167 ± 153 (CV: 0.92) in 2007 and 329 ± 220 (CV: 0.67) in 2008, and the number killed during both legal and illegal periods of turbot fishing were 2011 ± 742 (CV: 0.37) in 2007 and 2294 ± 806 (CV: 0.35) in 2008. The estimated range of harbour porpoise by-catch in the turbot fishery on the Turkish western Black Sea coast is between these two estimates. The by-caught harbour porpoises were between 1–8 years of age. About half of them were within the age range of 4 (26%) and 5 (21%) years old, and 78% were physically immature individuals. Turbot fishing carried out with bottom nets, especially in May and June, when turbot fishing is banned, is a threat to the sustainability of harbour porpoise stocks.

Keywords

turbot trammel netby-catch rateage determinationharbour porpoisebottlenose dolphinPhocoena phocoenaTursiops truncatus
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 96 , Issue 4: Marine Mammals , June 2016 , pp. 993 - 998
Copyright
Copyright © Marine Biological Association of the United Kingdom 2016 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

ACCOBAMS-SC7 (2011) Report of the seventh meeting of the scientific committee of ACCOBAMS. Monaco, 29–31 March 2011, ACCOBAMS-SC7/2011/Doc29, 50 pp.Google Scholar
Birkun, A. Jr (2002) Interactions between cetaceans and fisheries in the Black Sea. In Notarbartolo di Sciara, G. (ed.) Cetaceans of the Mediterranean and Black Seas: state of knowledge and conservation strategies. A report to the ACCOBAMS Secretariat, Monaco. Section 10, 11 pp.Google Scholar
Birkun, A. Jr (2008) The state of cetacean populations. In Oğuz, T. (ed.) State of the Environment of the Black Sea (2001–2006/7). Istanbul: Publication of the Commission on the Protection of the Black Sea Against Pollution (BSC), pp. 365–395.Google Scholar
Birkun, A. Jr and Krivokhizhin, S. (2011) Cetacean by-catch levels in the northern Black Sea: results of onboard monitoring programme. Report of the 2nd Transversal Working Group on by-catch, Antalya, Turkey, 7–9 December 2011. General Fisheries Commission for the Mediterranean, Scientific Advisory Committee, 33 pp.Google Scholar
Bjørge, A., Hohn, A.A. and Kvam, T. (1995) Report of the harbour porpoise age determination workshop, Oslo, 21–23 May 1990. Biology of the phocoenids. Reports of the International Whaling Commission (Special issue 16). Cambridge: IWC, pp. 467–484.Google Scholar
Gol'din, P.E. (2004) Growth and body size of the harbour porpoise, Phocoena phocoena (Cetacea, Phocoenidae) in the Sea of Azov and the Black Sea. Vestnik Zoologii 38, 59–73.Google Scholar
Gönener, S. and Bilgin, S. (2009) The effect of pingers on harbour porpoise, Phocoena phocoena bycatch and fishing effort in the turbot gill net fishery in the Turkish Black Sea Coast. Turkish Journal of Fisheries and Aquatic Sciences 9, 151–157.Google Scholar
Karaçam, H., Düzgüneş, E. and Durukanoğlu, H.F. (1990) A research on the age-weight and age-length compositions of the Black Sea dolphins. Istanbul University Fisheries Magazine 4, 35–44.Google Scholar
Kastelein, R.A., Au, W.W.L. and de Haan, D. (2000) Detection distances of bottom-set gillnets by harbour porpoises (Phocoena phocoena) and bottlenose dolphins (Tursiops truncatus). Marine Environmental Research 49, 359–375.Google Scholar
Mihaylov, K. (2011) Cetacean bycatches in turbot fisheries on the central coast of the Bulgarian Black Sea. Report of the 2nd Transversal Working Group on by-catch, Antalya, Turkey, 7–9 December 2011. General Fisheries Commission for the Mediterranean, Scientific Advisory Committee, 39 pp.Google Scholar
MOP 3 (2000) Resolution on incidental take of small cetaceans. 3rd Session of the Meeting of ASCOBANS Parties Bristol, United Kingdom, 26–28 July 2000, 4 pp.Google Scholar
Northridge, S. and Fortuna, C. (2008) Protocol for data collection on bycatch and depredation in the ACCOBAMS region. International Workshop Bycatch within the ACCOBAMS Area, Rome, Italy, 17–18 September 2008, 60 pp.Google Scholar
Öztürk, B. (1996) Whales and dolphins. Istanbul: Anahtar Publications [in Turkish].Google Scholar
Öztürk, B., Öztürk, A.A. and Dede, A. (1999) Cetacean by-catch in the western coast of the Turkish Black Sea in 1993–1997. In Evans, P.G.H., Cruz, J. and Raga, J.A. (eds) Proceedings of the Thirteenth Annual Conference of European Cetacean Society, Valencia, Spain. European Research on Cetaceans 13, 134 pp.Google Scholar
Pavlov, V., Artov, A. and Zhuravleva, T. (1996) Impact of fishing on Black Sea dolphins off the Crimea coasts. In Ozturk, B. (ed.) Proceedings of the First International Symposium on the Marine Mammals of the Black Sea 27–30 June 1994. Istanbul: United Nations Environmental Programme and United Nations Development Programme, pp. 41–43.Google Scholar
Perrin, W.F. and Myrick, A.C. Jr (eds) (1980) Growth of Odontocetes and Sirenians: problems in age determination. Report of the workshop. Age determination of toothed whales and sirenians. Reports of the International Whaling Commission (Special issue 3). Cambridge: IWC, pp. 1–50.Google Scholar
Tanabe, S., Murdhusree, B., Öztürk, A.A., Tatsukawa, R., Miyazaki, N., Özdamar, E., Aral, O., Samsun, O. and Öztürk, B. (1997) Persistent organochlorine residues in harbour porpoise (Phocoena phocoena) from the Black Sea. Marine Pollution Bulletin 34, 338–347.Google Scholar
Taner, L. (2010) Determination of amount of lost fishing gear which causes to ghost fishing in Istanbul artisanal fisheries. MSc thesis. Istanbul University, Istanbul, Turkey [in Turkish].Google Scholar
Tonay, A.M. and Öz, İ.M. (1999) Stomach contents of the harbour porpoise (Phocoena phocoena) by-catches in the western Black Sea. Underwater Science and Technology Meeting'99, Istanbul, pp. 92–98 [in Turkish].Google Scholar
Tonay, A.M. and Öztürk, B. (2003) Cetacean bycatches in turbot fishery on the western coast of the Turkish Black Sea. In Oray, I.K., Çelikkale, M.S. and Özdemir, G. (eds) International Symposium of Fisheries and Zoology (In memory of Ord. Prof. Dr. Curt KOSSWIG in His 100th Birth Anniversary), Istanbul, 23–26 October 2003. Istanbul: Istanbul University, Fisheries Faculty, pp. 131–138.Google Scholar
Woodley, T.H. and Read, A.J. (1991) Potential rates of increase of a harbour porpoise (Phocoena phocoena) population subjected to incidental mortality in commercial fisheries. Canadian Journal of Fisheries and Aquatic Sciences 48, 2429–2435.Google Scholar