Morphological characteristics of five bycatch sharks caught by southern Chilean demersal longline fisheries
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 end...
| Published in: | Scientia Marina |
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| Main Authors: | , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Consejo Superior de Investigaciones Científicas
2008
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| Subjects: | |
| Online Access: | https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/820 https://doi.org/10.3989/scimar.2008.72n2231 |
| Summary: | 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). El descarte de tiburones en las pesquerías demersales artesanales de congrio dorado (Genypterus blacodes) y de la raya volantín (Dipturus chilensis) es frecuente dentro de sus faenas de pesca, sin embargo, no existe un monitoreo sobre los desembarques que permita controlar este problema. Esto es evidente en especies endémicas, como son la mayoría de los condrictios costeros y de aguas profundas. El principal carácter sistemático de estas especies es su morfología externa, además de la forma del neurocráneo y disposición de dientes y dentículos dérmicos los que nos permiten identificar diferencias específicas. El objetivo de este trabajo es contribuir al conocimiento biológico y taxonómico de cinco especies de tiburones demersales en cuanto a la morfometría del neurocráneo, y morfología de dientes y dentículos dérmicos, de dos especies de Scyliorhínidos, Schroederichthys chilensis y Halaelurus canescens; además de tres Squaliformes, Centroscyllium granulatum, Deania calcea y Squalus acanthias. |
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