TAILIEUCHUNG - Otolith shape analysis as a tool for stock discrimination of the black scabbardfish, Aphanopus carbo Lowe, 1839 (Pisces: Trichiuridae), in Portuguese waters

The Evinox ModuSat satellite heating system has been designed to provide apartments and communal housing developments with independent fast recovery hot water and high efficiency heating. With a large range of models available, the system suits a variety of applications, from single occupancy apartments to groups of family homes. Consisting of a fast recovery hot water tank or high capacity heat exchanger, with either a hydraulic header or plate heat exchanger, pump and mixing valve set for the heating the ModuSat offers a total heating solution. This includes a meter for billing of energy usage and cold water consumption for . | STOCK STRUCTURE AND QUALITY OF BLACK SCABBARDFISH INTHE SOUTHERN NE ATLANTIC . Gordo ed. Scientia Marina 73S2 December 2009 47-53 Barcelona Spain ISSN 0214-8358 doi Otolith shape analysis as a tool for stock discrimination of the black scabbardfish Aphanopus carbo Lowe 1839 Pisces Trichiuridae in Portuguese waters INÊS FARIAS 1 ANA RITA VIEIRA 2 LEONEL SERRANO GORDO 2 and IVONE FIGUEIREDO 1 1 Unidade de Recursos Marinhos e Sustentabilidade INRB L-IPIMAR Av. Brasilia 1449-006 Lisboa Portugal. E-mail ifarias@ 2 Departamento de Biologia Animal and Centro de Oceanografia Faculdade de Ciências da Universidade de Lisboa Bloco C2 Campo Grande 1749-016 Lisboa Portugal. SUMMARY The variability in otolith contour shape of black scabbardfish Aphanopus carbo from Portuguese waters was analysed for stock discrimination purposes. The contour shape of otoliths from specimens caught off mainland Portugal Madeira and Azores archipelagos was digitised and extracted according to the closed-form Fourier analysis technique. Mainland and Madeira specimens were compared through the adjustment of a MANOVA model to the normalised elliptic Fourier descriptor NEFDs obtained for the otoliths of 200 females and 200 males sampled at each area. Significant differences were found between areas and between sexes the interaction term was not statistically significant. The effect of the area also proved to be significant when samples from the three regions were considered. These results were further supported by the discriminant analysis of the individual NEFDs for which the correct classifications were when they were considered by sex and total length for the mainland and Madeira and when NEFDs from the three areas were compared by sex and fish length. Otolith contour shape was shown to be a possible tool for differentiating between black scabbardfish stocks in the NE Atlantic. Keywords black scabbardfish otolith contour shape Fourier .

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