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Life history aspects of two species of the Squalus genus in the Eastern Ionian Sea

  • Aikaterini Anastasopoulou (a1), Chryssi Mytilineou (a1), Panayiota Makantasi (a1), Christopher J. Smith (a2), Stefanos Kavadas (a1), Eugenia Lefkaditou (a1) and Konstantia N. Papadopoulou (a2)...

Data on life history aspects of two species of Squalus genus were collated from five different studies carried out in the Eastern Ionian Sea from 1995 to 2014. Data were collected from 948 longnose spurdogs Squalus blainville (Risso, 1827) and 65 spiny dogfish Squalus acanthias Linnaeus, 1758 caught by trawl and longlines. The mean length of both species increased with depth. Sexual segregation was observed for S. blainville, whereas a segregation of immature and mature individuals was detected for S. acanthias. The length–weight relationship for S. blainville indicated positive allometry (b > 3) for both sexes, whereas a negative allometry (b < 3) was found for S. acanthias for the combined sexes. The sex ratio of both species was in favour of males. For S. blainville, the gonadosomatic and hepatosomatic indices differed significantly between sexes but not between seasons with the maturity data supporting the hypothesis of continuous reproduction throughout the year. Length at first maturity (L50) for female and male S. blainville was 603 and 413 mm respectively. For S. acanthias, males collected in autumn had finished their spawning activity; the single specimen caught in summer was reproductively active. Females, caught only in summer, were all gravid. Prey identified in the stomachs of S. blainville belonged to three major groups: fish, cephalopods and shrimps. Other groups such as echinoderms and ascidians were also found. Identified prey in the stomachs of S. acanthias belonged to two main groups, fish and cephalopods, although other groups (including echinoderms and polychaetes) were also present.

Corresponding author
Correspondence should be addressed to: A. Anastasopoulou, Hellenic Centre for Marine Research, Institute of Marine Biological Resources and Inland Waters, Athens, Greece Email:
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Avsar, D. (2001) Age, growth, reproduction and feeding of the spurdog (Squalus acanthias Linnaeus, 1758) in the south-eastern Black Sea. Estuarine, Coastal and Shelf Science 52, 269278.
Bañón, R., Piñero, C. and Casas, M. (2006) Biological aspects of deep-water sharks Centroscymnus coelolepsis and Centrophorus squamosus in Galician waters (north-western Spain). Journal of the Marine Biological Association of the United Kingdom 86, 643846.
Bertrand, J.A., Gil de Sola, L., Papaconstantinou, C., Relini, G. and Souplet, A. (2002) The general specifications of the MEDITS surveys. Scientia Marina 66(Suppl. 2), 917.
Bigelow, H.B. and Schroeder, W.C. (1953) Fishes of the Gulf of Maine. United States Department of the Interior, U.S. Fish Wildlife Service. Fishery Bulletin of the Fish and Wildlife Service 53. Washington, DC: U.S. Government Printing Office.
Bilge, G., Yapici, S., Filiz, H. and Cerim, H. (2014) Weight-length relations for 103 fish species from the southern Aegean Sea, Turkey. Acta Ichthyologica et Piscatoria 44, 263. doi: 10.3750/AIP2014.44.3.11.
Bradai, M.N., Saidi, B. and 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. Rome: FAO, no. 91, pp. 103.
Camhi, M. (1999) Sharks on the Line II: an analysis of Pacific State Shark Fisheries. Living Oceans Program Report. Islip, New York: National Audubon Society, 115 pp.
Campana, S.E., Joyce, W. and Kulka, D.W. (2009) Growth and reproduction of spiny dogfish off the eastern coast of Canada, including inferences on stock structure. In Gallucci, V.F., McFarlane, G.A. and Bargmann, G.G. (eds) Biology and management of dogfish sharks. Bethesda, MD: American Fisheries Society, pp. 195208.
Cannizaro, L., Rizzo, P., Levi, D. and Gancitano, S. (1995) Age determination and growth of Squalus blainvillei (Risso, 1826). Fisheries Research 23, 113125.
Capapé, C. and Quignard, J.P. (1980) Biology of Squalus blainvillei (Risso, 1826) (Pisces, Squalidae) from the Tunisian coast: relation of body, liver and gonadal weight. Relative coefficients of condition and of hepato and gonosomatic processes. Embryonic development. Archives de l'Institut Pasteur de Tunis 57, 385408.
Capapé, C. and Reynaud, C. (2011) Maturity, reproductive cycle and fecundity of the spiny dogfish Squalus acanthias (Chondrichthyes: Squalidae) off the Languedocian coast (southern France, northern Mediterranean). Journal of the Marine Biological Association of the United Kingdom 91, 16271635.
Castro, J.I. (1983) The sharks of North American waters. College Station, TX: Texas A & M University Press, 180 pp.
Cavanagh, R.D. and Gibson, C. (2007) Overview of the conservation status of cartilaginous fishes (chondrichthyans) in the Mediterranean Sea. Gland, Switzerland and Malaga, Spain: IUCN, Species Survival Commission Shark Specialist Group, vi + 42 pp.
Chatzispyrou, A. and Megalofonou, P. (2005) Sexual maturity, fecundity and embryonic development of the spiny dogfish, Squalus acanthias, in the eastern Mediterranean Sea. Journal of the Marine Biological Association of the United Kingdom 85, 11551161.
Compagno, L.J.V. (1984) Squaliformes-Dogfish sharks. In Fischer, W. and Nauen, C. (eds) FAO species catalogue, Volume 4. Sharks of the world: an annotated and illustrated catalogue of shark species known to date. Part I. Hexanchiformes to Lamniformes. Rome: FAO Fisheries Synopsis, no. 125, pp. 111113.
Compagno, L.J.V., Dando, M. and Fowler, S. (2005) A field guide to the sharks of the world. London: Harper Collins Publishing, 368 pp.
Damalas, D. and Vassilopoulou, V. (2011) Chondrichthyan by-catch and discards in the demersal trawl fishery of the central Aegean Sea (Eastern Mediterranean). Fisheries Research 108, 142152.
Demirhan, S.A. and Seyhan, K. (2006) Seasonality of reproduction and embryonic growth of spiny dogfish (Squalus acanthias L. 1758) in the Eastern Black Sea. Turkish Journal of Zoology 30, 433443.
Dunn, M.R., Stevens, D.W., Forman, J.S. and Connell, A. (2013) Trophic interactions and distribution of some Squaliforme sharks, including new diet descriptions for Deania calcea and Squalus acanthias. PLoS ONE 8, e59938. doi: 10.1371/journal.pone.0059938.
Ferry, L.A. and Cailliet, G.M. (1996) Sample size and data analysis: are we characterizing and comparing diet properly? In MacKinaly D. and Shearer K. (eds) Feeding ecology and Nutrition in Fish. Proceedings of the Symposium on the Feeding Ecology and Nutrition in Fish, International Congress on the Biology of Fishes, San Francisco, California, 14–18 July 1995. American Fisheries Society, pp. 7180.
Filiz, H. and Mater, S. (2002) A preliminary study on length-weight relationships for seven elasmobranch species from North Aegean Sea, Turkey. EU Journal of Fisheries and Aquatic Sciences 19, 401409.
Fischer, W., Bauchot, M.L. and Schneider, M. (1987) Fiches FAO d'identification des espèces pour les besoins de la pêche (Revision I). Méditerranée et mer Noire. Zone de pêche 37, Volume II, Vertèbres. Rome: FAO, pp. 7611530.
Gauld, J.A. and MacDonald, W.S. (1982) The results of tagging experiments on spurdogs Squalus acanthias around Scotland. International Council for the Exploration of the Sea (CM Papers and Reports), C.M. Doc., 1982/No. H:51.
Güven, O., Tebapçioğlu, T. and Deval, M.C. (2012) Length–weight relationships of sharks in Antalya Bay, eastern Mediterranean. Journal of Applied Ichthyology 28, 278279. doi: 10.1111/j.1439-0426.2011.01823.x.
Henderson, A.C., Flannery, K. and Dunne, J. (2002) Growth and reproduction in spiny dogfish Squalus acanthias L. (Elasmobranchii: Squalidae), from the west coast of Ireland. Sarsia 87, 350361. doi: 10.1080/0036482021000155805.
Henderson, C.A., Gallucci, V.F., Demaster, D. and Burke, W. (2010) The case of international commission for the conservation and management of sharks (ICCMS). Marine Policy 34, 12391248.
Hoenig, J.M. and Gruber, S.H. (1990) Life-history patterns in Elasmobranch: implications for fisheries management. In Pratt, H.L., Gruber, S.H. and Taniuchi, T. (eds) Elasmobranchs as living resources: advances in the biology, ecology, systematics, and the status of the fisheries (National Oceanic and Atmospheric Administration (NOAA) Technical Reports), NMFS, 90, pp. 115.
Hureau, J.C. (1970) Biologie comparée de quelques poissons antarctiques (Nototheniidae). Bulletin de ĺInstitut Océanographique, Monaco 68, 1244.
Hyslop, E.J. (1980) Stomach contents analysis – a review of methods and their application. Journal of Fish Biology 17, 411429.
Ismen, A., Yigin, C.C., Alitnagac, U. and Ayaz, A. (2009) Length-weight relationships for ten shark species from Saros Bay (North Aegean Sea). Journal of Applied Ichthyology 25, 109112. doi: 10.111/j.1439-0426.2009.01236.x.
Jones, T. and Ugland, K. (2001) Reproduction of female spiny dogfish, Squalus acanthias, in the Oslofjord. Fishery Bulletin 99, 685690.
Kabasakal, H. (2002) Stomach contents of the longnose spurdog, Squalus blainvillei (Risso, 1826) from the North-Eastern Aegean Sea. Annales, Series historia naturalis 12, 173176.
Kavadas, S., Damalas, D., Georgakarakos, E., Maravelias, C., Tserpes, G., Papaconstantinou, C. and Bazigos, G. (2013) IMAS-Fish-Integrated Management System to support the sustainability of Greek fisheries resources. A multidisciplinary web-based data-base management system: implementation, capabilities, utilization and future prospects for fisheries stakeholders. Mediterranean Marine Science 14, 109118.
Kirnosova, I.P. (1989) Reproduction of spiny dogfish, Squalus acanthias, in the Black Sea. Journal of Ichthyology 29, 2126.
Kousteni, V. and Megalofonou, P. (2011) Reproductive biology and embryonic development of Squalus blainvillei in the eastern Mediterranean Sea. Scientia Marina 75, 237249.
Kousteni, V. and Megalofonou, P. (2015) Aging and life history traits of the longnose spiny dogfish in the Mediterranean Sea: new insights into conservation and management needs. Fisheries Research 168, 619.
Lucifora, L.O., Menni, R.C. and Escalante, A.H. (2005) Reproduction, abundance and feeding habits of the broadnose sevengill shark Notorynchus cepedianus in north Patagonia, Argentina. Marine Ecology Progress Series 289, 237244.
MacPherson, E. and Duarte, C. M. (1991) Bathymetric trends in demersal fish size: is there a general relationship? Marine Ecology Progress Series 71, 103112.
Marouani, S., Kadri, H., Bouain, A. and Bradai, M.N. (2013) Size at maturity of Squalus megalops (Macleay, 1881) and Squalus blainvillei (Risso, 1826) from the Gulf of Gabès. Rapport Commission internationale pour L’ Exploration Scientifique De la Mer Méditerranée, Marseille, France. 40th CIESM Congress Proceedings, pp. 466.
Martinho, F., , C., Falcão, J., Nogueira Cabral, H. and Pardal, M.A. (2012) Comparative feeding ecology of two elasmobranch species, Squalus blainvillei and Scyliorhinus canicula, off the coast of Portugal. Fishery Bulletin 11, 7184.
Massutí, E. and Moranta, J. (2003) Demersal assemblages and depth distribution of elasmobranchs from the continental shelf and slope off the Balearic islands (western Mediterranean). ICES, Journal of Marine Science 60, 753766.
McEachran, J.D. and Branstetter, S. (1986) Squalidae. In Whitehead, P.J.P., Bauchot, M.-L., Hureau, J.-C., Nielsen, J. and Tortonese, E. (eds) Fishes of the North-eastern Atlantic and the Mediterranean, Volume 1. Paris: UNESCO, pp. 128147.
McMillan, D.G. and Morse, W.W. (1999) Essential fish habitat source. In Stehlik, L. (ed.) Spiny dogfish, Squalus acanthias, life history and habitat characteristics. National Oceanic and Atmospheric Administration (NOAA) Technical Memorandum. NMFS-NE-150. Woods Hole, MA: NOAA.
McRuer, J. and Hurlbut, T. (1996) The status of spiny dogfish (Squalus acanthias, Linnaeus) in the Bay of Fundy, Scotian Shelf and Southern Gulf of St. Lawrence (NAFO Divisions 4TVWX) in 1995. Department of Fisheries and Oceans (DFO) Atlantic Fisheries Research Document, Science Branch, Maritimes Region, Bedford Institute of Oceanography. DFO, 96/75, 27 pp.
Merella, P., Quetglas, A., Alemany, F. and Carbonell, A. (1997) Length-weight relationship of fishes and cephalopods from the Balearic Islands (Western Mediterranean). Naga, the ICLARM Quarterly 20, 6668.
Moranta, J., Palmer, M., Massuti, E., Stefanescu, C. and Morales-Nin, B. (2004) Body fish size tendencies within and among species in the deep sea of the western Mediterranean. Scientia Marina 68(Suppl. 3), 141152.
Mytilineou, Ch., Politou, C-Y., Papaconstantinou, C., Kavadas, S., D'Onghia, G. and Sion, L. (2005) Deep-water fish fauna in the Eastern Ionian Sea. Belgian Journal of Zoology 135, 229233.
Nieto, A., Ralph, G.M., Comeros-Raynal, M.T., Kemp, J., Garcia Criado, M., Allen, D.J., Dulvy, N.K., Walls, R.H.L., Russell, B., Pollard, D., Garcia, S., Craig, M., Collette, B.B., Pollom, R., Biscoito, M., Labbish Chao, N., Abella, A., Afonso, P., Alvarez, H., Carpenter, K.E., Clo, S., Cook, R., Costa, M.J., Delgado, J., Dureuil, M., Ellis, J.R., Farell, E.D., Fernandes, P., Florin, A-B., Fordham, S., Fowler, S., Gil de Sola, L., Gill Herrera, J., Goodpaster, A., Harvey, M., Heessen, H., Herler, J., Jung, A., Karmovskaya, E., Keskin, C., Knudsen, S.W., Kobyliansky, S., Kovačić, M., Lawson, J.M., Lorance, P., McCully Phillips, S., Munroe, T., Nedreaas, K., Nielsen, J., Papaconstantinou, C., Polidoro, B., Pollock, C.M., Rijnsdorp, A.D., Sayer, C., Scott, J., Serena, F., Smith-Vaniz, W.F., Soldo, A., Stump, E. and Williams, J.T. (2015) European red list of marine fishes. Luxembourg: Publications Office of the European Union.
Orlov, A.M., Kulish, E.F., Mukhametov, I.N. and Shubin, O.A. (2011) Age and growth of spiny dogfish Squalus acanthias (Squalidae, Chondrichthyes) in Pacific Waters off the Kuril Islands. Journal of Ichthyology 51, 4255.
Pallaoro, A., Jardas, I. and Šantić, M. (2005) Length-weight relationships for 11 chondrichthyan species in the eastern Adriatic Sea. Cybium 29, 9396.
Papaconstantinou, C. (1986) The ichthyofauna of Korinthiakos and Patraikos Gulfs and the Ionian Sea. Biologia Gallo-Hellenica 12, 229236.
Papaconstantinou, C. and Tortonese, E. (1980) On a collection of fishes from the Thermaikos Gulf (N.E. Greece). Thalassographica 3, 1542.
Papaconstantinou, C. and Tsimenidis, N. (1979) Some uncommon fishes from the Aegean Sea. Cybium 7, 314.
Pawson, M. and Vince, M. (1999) Management of shark fisheries in the Northwest Atlantic. In Shotton, R.(ed.) Case studies of the management of elasmobranch fisheries, FAO Fisheries Technical Paper 378/1. Rome: FAO, pp. 146.
Pethybridge, H., Daley, R.K. and Nichols, P.D. (2011) Diet of demersal sharks and chimaeras inferred by fatty acid profiles and stomach content analysis. Journal of Experimental Marine Biology and Ecology 409, 290299.
Pinkas, L., Olipham, M.S. and Iversor, I.L.K. (1971) Food habits of albacore, bluefin tuna and bonito in California waters. Fisheries Bulletin 152, 1105.
Politou, C-Y, Mytilineou, Ch., D'Onghia, G. and Dokos, J. (2008) Demersal faunal assemblages in the deep waters of the eastern Ionian Sea. Journal of Natural History 42, 661672.
Serena, F., Papaconstantinou, C., Relini, G., De Sola, L. and Bertrand, J. (2009) Distribution and abundance of spiny dogfish in the Mediterranean Sea based on the Mediterranean International Trawl survey program. In Gallucci, V.F., McFarlane, G.A. and Bargmann, G.G. (eds) Biology and management of dogfish sharks. Bethesda, MD: American Fisheries Society, pp. 139149.
Shepherd, T., Page, F. and MacDonald, B. (2002) Length and sex-specific associations between spiny dogfish (Squalus acanthias) and hydrographic variables in the Bay of Fundy and Scotian Shelf. Fisheries Oceanography 11, 7889.
Sims, D. (2005) Differences in habitat selection and reproductive strategies of male and female shark. In Ruckstuhl, K.E. and Neuhaus, P. (eds) Sexual segregation in vertebrates: ecology of the two sexes. Cambridge: Cambridge University Press, p. 127.
Sion, L., D'Onghia, G., Matarrese, A. and Mytilineou, Ch. (2003) First data on distribution and biology of Squalus blainvillei (Risso, 1826) from the eastern Mediterranean Sea. Journal of Northwest Atlantic Fishery Science 31, 210219.
Sokal, R.R. and Rohlf, F.J. (1987) Introduction to biostatistics. 2nd edition. New York, NY: Freeman.
Soldat, V.T. (2002) Spiny dogfish (Squalus acanthias L.) of the Northwest Atlantic Ocean (NWA). Northwest Atlantic Fisheries Organisation SCR Doc. 02/84.
Stehmann, M. (1998) Revised maturity scale for sharks, rays and chimaerids. In EC FAIR Project CT 95-0655. Document no. 40, pp. 17–21.
Stenberg, C. (2005) Life history of the piked dogfish (Squalus acanthias L.) in Swedish waters. Journal of Northwest Atlantic Fishery Science 35, 155164.
Tortonese, E. (1956) Fauna d’ Italia, Volume 2. Bologna: Edizioni Calderini, pp. 173176.
White, W.T., Blaber, S.J.M. and Craig, J.F. (2012) The current status of elasmobranchs: biology, fisheries and conservation. Journal of Fish Biology 80, 897900.
Whitehead, P.J.P., Bauchot, M.L., Hureau, J.C., Nielsen, J. and Tortonese, E. (1984) Fishes of the North-Eastern Atlantic and the Mediterranean (FNAM), Volumes 1–3. Paris: Unesco, 1473 pp.
WKMSEL (2012) Report of the workshop on Sexual Maturity Staging of Elasmobranchs (WKMSEL). 11–14 December 2012, Lisbon, Portugal. ICES CM 2012/ACOM: 59. 66 pp.
Yigin, C.C. and Ismen, A. (2013) Reproductive biology of spiny dogfish Squalus acanthias, in the North Aegean Sea. Turkish Journal of Fisheries and Aquatic Sciences 13, 169177.
Zar, J.H. (1996) Biostatistical analysis, 3rd edition. Englewood Cliffs, NJ: Prentice-Hall.
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