Publication
Aspectos da biologia do camarão Plesionika narval (Fabricius, 1787) nos Açores
| dc.contributor.advisor | Barros, Pedro Conte de | |
| dc.contributor.advisor | Pinho, Mário Rui | |
| dc.contributor.author | Graça, Gonçalo Nuno Santos Neto da | |
| dc.date.accessioned | 2011-09-07T16:04:31Z | |
| dc.date.available | 2011-09-07T16:04:31Z | |
| dc.date.issued | 2008 | |
| dc.description | Dissertação mest., Biologia Marinha, Universidade do Algarve, 2008 | por |
| dc.description.abstract | In this study, have been approached some aspects of the biology of Plesionika narval (Fabricius, 1787) around Azores Islands, with the purpose of deepening biological knowledge on the species. Data from 3 research cruises made between 1998 and 2006 in the central group of the archipelago and Princesa Alice’s sea bank were used. These surveys have used 5 different types of traps, some lying on the bottom and others raised above it. The hauls were made between 50 and 1200 m depths. Data analysis, especially significance testing, was carried out using generalised linear models (glm). P.narval was caught between 50 and 550 m, with higher catch rates at depths shallower than 150 m. The average CPUE values depend on the type of fish-trap and depth. However, the season of the year, as well as the area (island or sea bank) do not have a significant effect on those values. The 6273 sampled individuals had a carapace length (CL) between 6 and 20 mm. The average CL size of males was 13,6 mm, females 13,9 mm and ovigerous females 14,5 mm. The b coefficient in the length-weight relationship varies between 2,254 and 2,555. The length-weight relationship varies with sex, and between females, with sexual condition. The sex ratio varies with the season and depth, with a dominance of females during summer and at shallower depths. Ovigerous females occur year round but a peak was observed between spring and summer, when the ovigerous females are in shallow waters. The size at maturity in females was 13,5 mm CL. These results suggest a seasonal vertical migration of P.narval, possibly linked to the spawning cycle. | eng |
| dc.format | application/pdf | por |
| dc.identifier.other | 639.2 GRA*Asp Cave | |
| dc.identifier.uri | http://hdl.handle.net/10400.1/363 | |
| dc.language.iso | por | por |
| dc.subject | Teses | por |
| dc.subject | Pescas | por |
| dc.subject | Plesionika narval | por |
| dc.subject | Camarão | por |
| dc.subject | Distribuição | por |
| dc.subject | Captura | por |
| dc.subject | Crescimento | por |
| dc.subject | Portugal | por |
| dc.title | Aspectos da biologia do camarão Plesionika narval (Fabricius, 1787) nos Açores | por |
| dc.type | master thesis | |
| dspace.entity.type | Publication | |
| rcaap.rights | openAccess | por |
| rcaap.type | masterThesis | por |
| thesis.degree.grantor | Universidade do Algarve. Biologia Marinha | por |
| thesis.degree.level | Mestre | por |
| thesis.degree.name | Mestrado em Biologia Marinha | por |
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