Data/hora: 11/06/2024 14:39:26

Provedor de dados: | 5
País: | France
Título: | Aires de ponte de la sardine, du sprat et de l'anchois dans le golfe de gascogne et sur le plateau celtique resultats de 6 annees d'etude
Autores: | Arbault, Suzanne; Lacroix, Nicole.
Data: | 1971-03
Ano: | 1971
Resumo: | This research work was undertaken in 1964, within the more general context of study programmes of the Institute of Science and Technology of Maritime Fishing on teleosteen fish eggs and larvae and the relationship of egg-laying areas with hydrology. Since their catch is a significant contribution to the country's economy (15,000 tonnes of sardines in 1967, 6,000 in 1968, 8,000 in 1969 and 4,427 of anchovies were caught the same year), it seemed necessary to specify the breeding conditions of these fish and the location of their breeding grounds, then to try to forecast fishing stocks. In this research work, we will study more particularly the year 1968, which seems to us very representative and we will compare the results with those of 1964, 1965, 1966 (March), which we have already published and from 1969, which have not yet been published. For May 1966 and the year 1967, we will refer to the research of L'HERROU (soon to be published). Hence, the results from these 6 years, obtained from 2,107 samplings from 22 campaigns, we will attempt to give precise indications about egg-laying sectors, spawning season and favourable environmental conditions. Each year, the campaigns have been carried out quarterly (March, May, July, November), mostly covering the continental shelf of the Celtic Sea at the bottom of the Gulf of Gascony. However, in 1965, the prospecting was done mainly on the open sea, with several catches along the 8th meridian of longitude O, and, in March 1966 as in 1969, the Celtic shelf was not included. The net used is of the Hensen type, 70 cm in diameter at the opening and 2.50 metres overall length. It was used most of the time for vertical fishing between 100 metres and the surface or the vicinity of the bottom and the surface. The ascent speed was 1 metre in 3 seconds. Each harvest of plankton was accompanied by hydrological measurements, especially temperature and salinity at various levels. In March of 1966, the samplings were done differently: by horizontal surface strokes for 10 minutes with a standard 60 silk net and 30-centimetre opening.
Tipo: | Text
Idioma: | Francês
Identificador: | http://archimer.ifremer.fr/doc/1971/publication-2385.pdf
Editor: | ISTPM
Relação: | http://archimer.ifremer.fr/doc/00000/2385/
Formato: | application/pdf
Fonte: | Revue des Travaux de l'Institut des Pêches Maritimes (0035-2276) (ISTPM), 1971-03 , Vol. 35 , N. 1 , P. 35-56
Fonte: | Ifremer