An investigation on the skate fishing at M'diq and Tangier ports (Northern Morocco)

Abstract

AbstractThis study encompasses skate fishing at M'diq and Tangier ports (Morocco Mediterranean coast). It addresses the exploitation of these Chondrichthyans by analyzing skate landings during 2006-2010. Skates are usually recorded under general taxonomic groups in the Moroccan fishery statistics, being identified only to family (Rajidae) or genus (Raja spp.). This fact makes it difficult to obtain better knowledge of the stock of the species in commercial landings of rays and skates. Results show that skate landings at the M'diq port are greater than those recorded at the Tangier port.

Keywords

• Keywords: skate, exploitation, Mediterranean, Morocco

References

1. 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, vii + 61pp.
2. Aldebert, Y. (1997) Demersal resources of the Gulf of Lions (NW Mediterranean). Impact of exploitation on fish diversity. Vie Milieu 47: 275– 284.
3. Bonfil, R., Abdullah, M. (2004) Field Identification Guide To The Sharks and Rays of the Red Sea and Gulf of Aden. FAO Species Identification Guide for Fishery Purposes. Rome, FAO: 71 pp. + 12 colour plates.
4. Bradai, M.N., Saidi, B., Enajjar, S. (2012) Elasmobranchs of the Mediterranean and Black Sea: Status, Ecology and Biology. Bibliographic Analysis. Studies and Reviews. General Fisheries Commission for the Mediterranean. No. 91. FAO, Rome. 103 pp.
5. Dulvy, N.K., Sadovy, Y., Reynolds, J.D. (2003) Extinction vulnerability in marine populations. Fish Fishies 4: 25–64.
6. Dulvy, N.K., Reynolds, J.D. (2002) Predicting extinction vulnerability in skates. Conserv. Biol. 16: 440–450.
7. Ellis, J.R., Silva, J.F., McCully, S.R., Evans, M., Catchpole, T. (2010) UK Fisheries for Skates (Rajidae): History and Development of the Fishery, Recent Management Actions and Survivorship of Discards. ICES Document CM 2010/E: 10. 38 pp.
8. FAO (1998) Guide d’identification des espèces pour les besoins de la pêche. Guide d’Identification des Ressources Marines Vivantes du Maroc, FAO, Rome. 28 planches en couleur. 263 pp.

9. FAO (2007) FishStat Plus. Universal Software for Fishery Statistical Time Series, 1997–2007, FAO, Rome.v.2.32.
10. FAO (2008) Fisheries Department, Fishery Information, Data and Statistics Unit. FISHSTAT plus: Universal Software for Fishery Statistical Time Series (Version 2.3). Capture production 1950–2007.
11. Ferretti, F., Myers, R.A., Serena, F., Lotze, H.K. (2008) Loss of large predatory sharks from the Mediterranean Sea. Conserv. Biol. 22: 952– 964.
12. Ferretti, F., Worm, B., Britten, G., Heithaus, M., Lotze, H. (2010) Patterns and ecosystem consequences of shark declines in the ocean. Ecol. Lett. 13: 1055–1071.
13. Hoenig, J.M., Gruber, S.H. (1990) Life-history Patterns in Elasmobranchs: Implications in Fisheries Management. NOAA Technical Report, NMFS-90, 16 pp.
14. Jukic–Peladic, S., Vrgoc, N., Krstulovic–Sifner, S., Piccinetti, C., Piccinetti– Manfrin, G., Marano, G., Ungaro, N. (2001) Long–term changes in demersal resources of the Adriatic Sea: Comparison between trawl surveys carried out in 1948 and 1998. Fisheries Research 53: 95–104.
15. Last, P., Stevens, J.D. (2009) Sharks and Rays of Australia. 2nd ed. Harvard University Press, 644 pp.
16. Lotze, H.K., Coll, M., Dunne, J. (2011) Historical changes in marine resources, food web structure and ecosystem functioning in the Adriatic Sea. Ecosystems 14: 198–222.
17. Ragonese, S., Cigala Fulgosi, F., Bianchini, M.L., Norrito, G., Sinacori, G. (2003) Annotated checklist of the skates (Condrichthyes, Rajidae) in the Strait of Sicily (Central Mediterranean). Biologia Marina Mediterranea, 10: 874–881.
18. Serena, F. (2005) Field Identification Guide to the Sharks and Rays of the Mediterranean and Black Sea. In: FAO Species Identification Guides for Fishery Purposes, FAO, Rome. 136 pp.
19. Stevens, J.D., Bonfil, R., Dulvy, N.K., Walker, P.A. (2000) The effects of fishing on sharks, rays, and chimeras (chondrichthyans), and the implications for marine ecosystems. ICES Journal of Marine Science 57:476 –494.
20. Walker, P.A., Hislop, J.R.G. (1998) Sensitive skates or resilient rays? Spatial and temporal shifts in ray species composition in the central and north- western North Sea between 1930 and the present day. ICES Journal of Marine Science 55: 392-402.