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Autumn larval fish assemblages in the northwest African Atlantic coastal zone

Chinese Journal of Oceanology and Limnology 2017年第3期35卷 515-527页

作者： abdelouahab hinde BERRAHO Amina BAIBAI Tarik AGOUZOUK Aziz MAKAOUI Ahmed ERRHIF Ahmed Faculty of Sciences Ain Chock Hassan 1I UniversityB.P.5366MaarifCasablanca20100Morocco National Institute of Halieutic Research Street Sidi Abderrahmane Club equestre Ould JmelCasablanca20100Morocco

A study on the assemblage composition and vertical distribution of larval fish was conducted in the southern area of the Moroccan Atlantic coast in Autumn 2011. A total of I 680 fish larvae taxa were identified from 21 families. The majority of the larvae were present in the upper layers. Clupeids were the most abundant larvae taxa followed by Myctophidae, Gadidae and Sparidae, hence the larval fish assemblages （LFA） were variable in different depth layers. Total fish larvae showed a preference for surface layers, and were mainly found above 75 m depth, with some exceptions. The maximum concentration of fish larvae was concentrated up to 25 m essentially above the thermocline, where chlorophyll a and mesozooplankton were abundant. Spatially, neritic families were located near the coast and at some offshore stations especially in the northern part, while oceanic families were more distributed towards offshore along the study area. Cluster analysis showed a segregation of two groups of larvae. However, a clear separation between neritic families and oceanic families was not found. Multivariate analysis highlighted the relationship between the distribution of larvae of different families and environmental parameters. Temperature and salinity seem to have been the factors that acted on associations offish larvae. Day/night vertical distributions suggest there was not a very significant vertical migration, probably due to adequate light levels for feeding.

关键词： fish larvae vertical distribution association hydrology multivariate analysis

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