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| Registros recuperados: 91 | |
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| Petit, Didier; Cotel, Pascal; Nugroho, D.. |
| The coastal borders of northern Java and eastern Sumatra have been prospected during the acoustic surveys, in the depth of about 115 to 50 m, in wet season. The measures of relative density per nautical mile, the vertical distribution of the abundance and shoals have been analyzed. The general characteristics can be drawn-up : they are the extension of an abundant semipelagic fauna occupying the bathymetric strata from 25 to 45 m, and the existence of a dominant pelagic fauna are more coastal. Shoals, low reverberating, are present in all areas but are dominant in the coastal border ; the more reverberating aggregations are more off shore. From the East to the West, their bathymetric localization increases in the sectors near oceanic influences, they are... |
| Tipo: Text |
Palavras-chave: RESSOURCES HALIEUTIQUES; ZONE COTIERE; POISSON MARIN; ESPECE PELAGIQUE; DENSITE DE POPULATION; REPARTITION VERTICALE; ETHOLOGIE; RYTHME NYCTHEMERAL; VARIATION SAISONNIERE; SAISON HUMIDE; ZONATION ECOLOGIQUE. |
| Ano: 1997 |
URL: http://www.documentation.ird.fr/hor/fdi:010017252 |
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| Fréon, Pierre; Gerlotto, François; Soria, Marc. |
| Pelagic fishes generally dispers at dusk and aggregate in schools at dawn. The dynamics (duration, variation in school number, and characteristics) of these two behavioural processes have been studied during a 26 h survey in a small area of high fish abundance in the Catalan Sea (Spain). The dynamics of aggregation and dispersion were investigated using a dual-beam vertical echo-sounder (BioSonics) connected to a special school integrator software package (INES-MOVIES-B) which estimates school parameters in terms of size, geometry, and density. This study shows that, during the night, fish dispersion is limited and schools can still be observed. They are characterized by a highly skewed distribution of the cross-sectional area (many small schools plus a... |
| Tipo: Text |
Palavras-chave: POISSON MARIN; ESPECE PELAGIQUE; COMPORTEMENT SOCIAL; RYTHME NYCTHEMERAL; SONAR; BANC DE POISSONS. |
| Ano: 1996 |
URL: http://www.documentation.ird.fr/hor/fdi:010008042 |
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| Registros recuperados: 91 | |
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