Data/hora: 02/06/2024 14:22:58

Provedor de dados: | 5
País: | France
Título: | Preliminary results of aerial surveys of bluefin tuna in the western Mediterranean sea
Autores: | Fromentin, Jean-marc; Farrugio, Henri; Deflorio, Michèle; De Metrio, Gregorio.
Data: | 2003
Ano: | 2003
Palavras-chave: | Atlantic bluefin tuna; Aerial survey; Index of abundance; Gulf of Lions; Ligurian and Tyrrhenian Sea.
Resumo: | One of the aims of the EU project STROMBOLI (2000-2002) was to conduct an aerial survey for bluefin tuna in the western Mediterranean Sea to test the feasibility of computing an index of abundance from direct observation. This approach has at least two advantages: (i) to provide fishery-independent information and observation, and (ii) to compensate for the lack of Mediterranean purse seine CPUE indices. The first surveys were done in June-July 2000 over the Balearic and Sicilian areas, where and when adult bluefin tuna used to concentrate for spawning, but the results were disappointing (spawners can hardly be detected from a plane). In contrast, the results obtained from the surveys for juveniles of BFT in the Gulf of Lions and in the Ligurian and Tyrrhenian seas are positive and encouraging. The number of BFT schools being detected was, on average, rather high and the variance between transects appeared satisfactory. Furthermore, the main characteristics, e.g., location and size of schools, fish behaviour, perpendicular distance of the detection, were consistent between the 2000 and 2001 surveys. This study will be pursued and extended in 2002.
Tipo: | Text
Idioma: | Inglês
Identificador: | http://archimer.ifremer.fr/doc/00194/30531/28949.pdf
Editor: | ICCAT
Relação: | http://archimer.ifremer.fr/doc/00194/30531/
Formato: | application/pdf
Fonte: | Collective Volume of Scientific Papers (1021-5212) (ICCAT), 2003 , Vol. 55 , N. 3 , P. 1019-1027
Fonte: | ICCAT