| Titre : |
Some comments on abundance indices and probing surveys |
| Titre original : |
Commentaires sur les indices d'abondance et les campagnes de sondage |
| Type de document : |
texte imprimé |
| Auteurs : |
Marc Labelle, Auteur |
| Editeur : |
ORSTOM |
| Année de publication : |
1998 |
| Importance : |
p 177-191 |
| Langues : |
Anglais (eng) |
| Catégories : |
SCIENCES DE LA MER
|
| Mots-clés : |
RECHERCHE MARINE INDICE D'ABONDANCE PECHE MARINE THON CAMPAGNE DE SONDAGE |
| Résumé : |
This chapter talks about the analyses of the tuna in Indian Ocean based on catch and effort statistics of stock size. More reliable estimates can be obtained by using ancillary data to tune or calibrate models used to conduct sequential population analyses (SPA). Ideally, independent and accurate estimates of abundance should be used for this purpose. This can include data from hydro-acoustic cenuses, mark-recapture operations, depletion experiments, aerial survey reports and so forth. Such methods are not applied in a cost-effective fashion to assess the abundance of large pelagic fish in various regions within short time intervals. As a result, stock-assessment biologists still rely to a considerable extent on catch-per-unit effort (CPUE) indices to calibrate SPA models, usually under the assumption that there is a linear relation between CPUE and abundance. The shape of this relation may be subject to debate but experts do tend to agree on the need for having reliable and representative statistics for assessment purposes. |
| Numéro du document : |
MAR 23 |
| Niveau Bibliographique : |
2 |
| Bull1 (Theme principale) : |
GESTION DE L'ENVIRONNEMENT MARIN |
| Bull2 (Theme secondaire) : |
GESTION DES RESSOURCES MARINES |
Some comments on abundance indices and probing surveys = Commentaires sur les indices d'abondance et les campagnes de sondage [texte imprimé] / Marc Labelle, Auteur . - ORSTOM, 1998 . - p 177-191. Langues : Anglais ( eng)
| Catégories : |
SCIENCES DE LA MER
|
| Mots-clés : |
RECHERCHE MARINE INDICE D'ABONDANCE PECHE MARINE THON CAMPAGNE DE SONDAGE |
| Résumé : |
This chapter talks about the analyses of the tuna in Indian Ocean based on catch and effort statistics of stock size. More reliable estimates can be obtained by using ancillary data to tune or calibrate models used to conduct sequential population analyses (SPA). Ideally, independent and accurate estimates of abundance should be used for this purpose. This can include data from hydro-acoustic cenuses, mark-recapture operations, depletion experiments, aerial survey reports and so forth. Such methods are not applied in a cost-effective fashion to assess the abundance of large pelagic fish in various regions within short time intervals. As a result, stock-assessment biologists still rely to a considerable extent on catch-per-unit effort (CPUE) indices to calibrate SPA models, usually under the assumption that there is a linear relation between CPUE and abundance. The shape of this relation may be subject to debate but experts do tend to agree on the need for having reliable and representative statistics for assessment purposes. |
| Numéro du document : |
MAR 23 |
| Niveau Bibliographique : |
2 |
| Bull1 (Theme principale) : |
GESTION DE L'ENVIRONNEMENT MARIN |
| Bull2 (Theme secondaire) : |
GESTION DES RESSOURCES MARINES |
|
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