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FINE-SCALE DISTRIBUTION OF LARVAL FISH AND ZOOPLANKTON OVER A MESOSCALE FRONT EXPLORED THROUGH HIGH FREQUENCY IMAGING
EP21713
FINE-SCALE DISTRIBUTION OF LARVAL FISH AND ZOOPLANKTON OVER A MESOSCALE FRONT EXPLORED THROUGH HIGH FREQUENCY IMAGING
Submitted on 21 Mar 2014

Robin Faillettaz; Jessica Luo; Cédric Guigand; Robert K. Cowen; Jean-Olivier Irisson
UPMC Univ Paris 06, UMR 7093, LOV, Observatoire océanologique, F-06234, Villefranche/mer, France
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Poster Abstract
Current knowledge of larval fish distribution in the fine-scale (<10m) is limited, as even the most advanced nets integrate over 10s of m of depth and 100s of m horizontally. Yet, this fine-scale is the one relevant for biological interactions such as predation or gregarious behaviour. New imaging tools, like the In Situ Ichthyoplankton Imaging System (ISIIS; goo.gl/n6BSgP), gather simultaneously, and at the same high resolution, physical data and images of biological organisms. ISIIS can therefore provide very fine scale distribution estimates (<1m). To describe sub-mesoscale community structure and bio-physical interactions in a frontal feature, we towed ISIIS in the upper 130 m during a two-week cruise across the Ligurian Front (NW Mediterranean Sea). We surveyed the front using two sampling strategies : 1) seven 45 km cross-front transects, and 2) 15 transects in the same water mass, tracked by Lagrangian surface drifters for 48 h. We present preliminary data on zooplankton distribution with respect to the physical environment, with a focus on ichthyoplankton within a community context.


Cowen, R. K., & Guigand, C. M. (2008). In situ ichthyoplankton imaging system (ISIIS): system design and preliminary results. Limnology and Oceanography: Methods, 6, 126–132.Report abuse »
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