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| Le Moine, Olivier. |
| Estimating farmed shellfish stocks is essential, in terms of both developing shellfish farms and evaluating trophic capacities with respect to existing stocks. At Marennes-Oléron, estimation is carried out every five years, following a multi-layered strategy. First, cluster sampling of areas of 1 ha provided an estimate of biomass per surface area as well as characteristics of oyster farms (age, type of collectors used, etc.). These data were then interpolated to the stratum level. Second, the overall exploitation rate of the stratum was estimated based on coverage by aerial photographs. Both types of data have been processed using special statistical software developed using a database and Kman language (SGBD; Maurer, 1989). Photos were analysed under a... |
| Tipo: Text |
Palavras-chave: Marennes Oléron; Pertuis Charentais; Crassostrea gigas; Huîtres; Estimation stocks; SIG. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/2001/acte-3264.pdf |
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| Buestel, Dominique; Dao, Jean-claude; Gohin, Francis. |
| The efficiency of the fishing drags in the Saint Brieuc Bay, Brittany, has been determined through the analysis of the tracks left on the seabed. The results, which focus mostly on the age class n°2 (2.5 years), show that the efficiency and the damages caused by the drags vary heavily according to the nature of the seabed. For soft bottoms, the average efficiency is 67 % and the global damage is 2 %. Concerning hard bottoms, the values are respectively 30 % and 17 %. These efficiency results combined with those of a dragging expedition in a set sector of the Saint-Brieuc Bay enable a direct assessment of the abundance. A result treatment method deriving from the geostatistical theory is used: it takes into account the spatial structure of the king scallop... |
| Tipo: Text |
Palavras-chave: Coquille Saint Jacques; Plongée; Dragage; Pecten maximus L.; Estimation stocks. |
| Ano: 1985 |
URL: http://archimer.ifremer.fr/doc/1985/acte-6536.pdf |
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