Preprint volume - SIBM
Preprint volume - SIBM
Preprint volume - SIBM
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Pre-print Volume –Oral presentations<br />
Topic 4: THE ELASMOBRANCHS<br />
dominated by just one species, M. mustelus, with the other poorly represented. A<br />
relative increase in M. mustelus and decrease in R. clavata and S. canicula has been<br />
already observed in the Adriatic Sea (Jukic-Peladic et al., 2001), however in the fish<br />
market surveys presented here some of the species previously reported for the Adriatic<br />
were never found. At the fish market, a remarkable high proportion of the recorded<br />
males were sexually immature. All these data together strongly indicate the nonsustainability<br />
of elasmobranch fishery. The demographic models confirmed the<br />
observed trends, predicting such a reduction of populations of M. mustelus and S.<br />
canicula to be close to local extinction. However the models indicate also which<br />
management strategy could give the best results. Banning the fishery of immature<br />
individuals could, indeed, promote the recovery of the two populations. Such strategy<br />
is feasible for elasmobranch: even if they are usually bycatch, in general high survival<br />
rates of discarded individuals have been proved in different species.<br />
References<br />
BONFIL R. (1994) - Overview of world elasmobranch fisheries. FAO Fisheries Technical Paper No.<br />
341: 158 pp.<br />
CAPAPÉ’ C., VERGNE Y., REYNAUD C., GUÉLORGET O., QUIGRAND J.P. (2008) - Maturity,<br />
fecundity and occurrence of the small sposttes catshark Scyliorhinus canicula (Chondrichthyes:<br />
Scyliorhinidae) off the Languedocial coast (Southern France, North-Western Mediterranean). Vie<br />
et Milieu, 58: 47-55.<br />
DULVY N.K., BAUM J.K., CLARKE S., COMPAGNO L.J.V., CORTÉS E., DOMINGO A.,<br />
FORDHAM S., FOWLER S., FRANCIS M.P., GIBSON C., MARTÍNEZ J., MUSICK J.A.,<br />
SOLDO A., STEVENS J.D., VALENTI S. (2008) - You can swim but you can’t hide: the global<br />
status and conservation of oceanic pelagic sharks and rays. Aquatic Conservation: Marine and<br />
Freshwater Ecosystems, 18: 459-482.<br />
FERRETTI F., MYERS R.M., SERENA F., LOTZE H.K. (2008) - Loss of large predatory sharks<br />
from the Mediterranean sea. Conservation Biology, 22: 952-964.<br />
FRISK M.G., MILLER T.J., FOGARTY M.J. (2001) - Estimation and analysis of biological<br />
parameters in elasmobranch fishes: a comparative life history study. Canadian Journal of<br />
Fishery and Aquatic Science, 58: 969-981.<br />
FROESE R., PAULY D. (2010) - FishBase. World Wide Web electronic publication.<br />
www.fishbase.org, version (01/2010).<br />
JUKIC-PELADIC S., VRGOC N., KRSTULOVIC-SIFNER S., PICCINETTI C., PICCINETTI-<br />
MANFRIN G., MARANO G., UNGARO N. (2001) - Long-term changes in demersal resources<br />
of the Adriatic Sea: comparison between trawl surveys carried out in 1948 and 1998. Fisheries<br />
Research, 53: 95-104.<br />
ROSE K.A., COWAN JR J.H., CLARK M.E., HOUDE E.D., WANG S.-B. (1999) - An individualbased<br />
model of bay anchovy population dynamics in the mesohaline region of Chesapeake Bay.<br />
Marine Ecology Progress Series, 185: 113-132.<br />
SAÏDI B., BRADAÏ M.N., BOUAÏN A. (2008) - Reproductive biology of the smooth-hound shark<br />
Mustelus mustelus (L.) in the Gulf of Gabès (south-central Mediterranean Sea). Journal of Fish<br />
Biology, 72: 1343-1345.<br />
41 st S.I.B.M. CONGRESS Rapallo (GE), 7-11 June 2010<br />
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