Scientia Marina, Vol 72, No 2 (2008)

Morphological characteristics of five bycatch sharks caught by southern Chilean demersal longline fisheries

Andrea Valenzuela
Instituto de Zoología, Universidad Austral de Chile, Chile

Carlos Bustamante
Instituto de Zoología, Universidad Austral de Chile, Chile

Julio Lamilla
Instituto de Zoología, Universidad Austral de Chile, Chile


The by-catch of sharks in artisanal demersal pink cusk-eel (Genypterus blacodes) and yellownose skate (Dipturus chilensis) fisheries is frequent within their fishing effort. Nevertheless, there is no registry of landings, which could help to control this problem. This is particularly evident for endemic species, which includes most coastal and deep water Chilean sharks. The main systematic characteristic of these Chondrichthyan species is the external morphology of the neurocraneum. The form and arrangement of the teeth and dermal denticles allow specific differences to be identified. The objective of this paper is to contribute to the biology and systematic knowledge of demersal shark species, teeth and dermal denticle morphology and neurocraneum morphometrics of two species of Scyliorhinids, the redspotted catshark (Schroederichthys chilensis) and the dusky catshark (Halaelurus canescens), as well as three Squaliforms, the granular dogfish (Centroscyllium granulatum), the birdbeak dogfish (Deania calcea) and the spiny dogfish (Squalus acanthias).


shark bycatch; teeth; dermal denticles; neurocraneum morphology

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Applegate, S.P. – 1965. Tooth terminology and variation in sharks with special reference to the sand shark, Carcharias Taurus Rafinesque. Nat. Hist. Mus. Los Angeles, Contr. Sci, 086: 1-18.

Bonfil, R. – 1994. Overview of world elasmobranch fisheries. FAO Fish.Tech. 341: 1-119.

Brander, K. – 1981. Disappearance of common skate Raia batis from Irish Sea. Nature, 290: 48-49. doi:10.1038/290048a0

Chirichigno, N. – 1974. Clave para identificar los peces marinos del Perú. Instituto del Mar del Peru, Callao.

Compagno, L.J.V. – 1984. FAO Species Catalogue. Vol. 4. Sharks of the World. An annotated and illustrated catalogue of sharks species know to date. FAO Fish. Biol. Synop. (125), vol. 4, pt 1: 1-250.

Compagno, L.J.V. – 1988. Sharks of the order Carcharhiniformes. Princeton University Press, New Jersey.

Compagno, L.J.V. – 2001. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. FAO Species Catalogue for Fishery Purposes 1 (2): 1-269.

Deynat, P.P. – 2000. Les denticules myrmécoïdes, un noveau caractère diagnostique pour les Rajidé (Chondricties, Batoydea). Ann Sci. Nat., 21 :65-80

Gravendeel, R., W. Van neer and D. Brinkhuizen. – 2002. An identification key for dermal denticles of Rajidae from the North Sea. Int. J. Osteoarchaeol., 12: 420-441. doi:10.1002/oa.645

Hall, M., D. Alverson and K. Metuzals. – 2000. By-Catch: Problems and Solutions. Mar. Poll. Bull., 41 (1-6): 204-219.

Ishiyama, R. – 1958. Studies on the rajid fishes (Rajidae) found in the waters around Japan. J. Shimonoseki Coll. Fish., 7: 193-394.

Johns, M.J., C.R Barnes and M.J. Orchard. – 1997. Taxonomy and biostratigraphy of Middle and Late Triassic elasmobranch ichthyoliths from north-eastern British Columbia. Geol. Surv. Can. Bull., 502: 1-235

Lamilla, J. – 2003. Life history of deep-sea Chilean Chondrichthyan. Conservation and Management of Deep-sea Chondrichthyan Fishes. Deep Sea Conf. 2003: 4

Lamilla J. and S. Saez. – 2003. Clave taxonómica para el reconocimiento de especies de rayas chilenas (Chondrichthyes, Batoidea). Inv. Mar. Valparaíso, 31(2) 3:16.

Lamilla, J. and C. Bustamante. – 2005. Guía de Campo para el reconocimiento de especies de Tiburones, Rayas y Quimeras. Oceana 17: 1-72

Leible, M., D.M. Dittus and C.G. Belmar. – 1981. Atlas anatómico de la pintarroja, Schroederichthys chilensis. Universidad Católica de Chile, Talcahuano.

Meléndez, R. and D. Meneses. – 1989. Tiburones del Talud Continental recolectados entre Arica (18º30’S) e Isla Mocha (38º30’S). Chile. Inv. Mar. Valparaíso, 17: 3-37.

Stevens J.D., R. Bonfil, K. Dulvy and T.A. Walker. – 2000. The effects of fishing on sharks, rays, and chimaeras (Chondrichthyan), and the implications for marine ecosystems. ICES J. Mar. Sci., 57: 476-494. doi:10.1006/jmsc.2000.0724

Sho Tanaka S., T. Kitamura and H. Nakano. -2002. Identification of shark species by SEM observation of denticle of shark fins. Col. Vol.Sci.Pap. ICCAT, 54 (4): 1386-1394. (2002)

Valenzuela A., R. Saldivia, C. Bustamante and J. Lamilla. – 2006. Diferenciación morfológica de tres especies de Scyliorhinidae mediante dentículos dérmicos, Halelururs canescens (Günther, 1878), Schroederichthys chilensis (Guichenot, 1848) y Schroederichthys bivius (Smith, 1938) (Chondrichthyes: Scyliorhinidae). XXVI Congr. Cienc. Mar, Iquique.

Walker, P.A. and J.R.G. Hislop. – 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 J. Mar. Sci., 55: 392-402. doi:10.1006/jmsc.1997.0325

Wheeler A. and A.K. Jones. – 1989. Fishes. Cambridge Manuals in Archaeology. Cambridge University, Cambridge.

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