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Effect of current and daylight variations on small-pelagic fish aggregations (Selar crumenophthalmus) around a coastal fish aggregating device studied by fine-scale acoustic tracking

Aquatic living resources (Montrouge), 2013-01, Vol.26 (1), p.63-68 [Peer Reviewed Journal]

2014 INIST-CNRS ;EDP Sciences, IFREMER, IRD 2012 ;Distributed under a Creative Commons Attribution 4.0 International License ;ISSN: 0990-7440 ;EISSN: 1765-2952 ;DOI: 10.1051/alr/2012025 ;CODEN: ALREEA

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Title:
Effect of current and daylight variations on small-pelagic fish aggregations (Selar crumenophthalmus) around a coastal fish aggregating device studied by fine-scale acoustic tracking
Author: Capello, Manuela ; Soria, Marc ; Potin, Gael ; Cotel, Pascal ; Dagorn, Laurent
Subjects: Acoustic telemetry ; Agnatha. Pisces ; Agricultural sciences ; Animal and plant ecology ; Animal biology ; Animal, plant and microbial ecology ; Applied ecology ; Behaviour ; Biodiversity and Ecology ; Biological and medical sciences ; Daylight effects ; Environmental Sciences ; Exploitation and management of natural biological resources (hunting, fishing and exploited populations survey, etc.) ; Fish aggregation ; Fundamental and applied biological sciences. Psychology ; Indian Ocean ; Life Sciences ; Marine ; Moored FAD ; Rheotaxis ; Sciences and technics of fishery ; Sea water ecosystems ; Selar crumenophthalmus ; Small pelagic fish ; Synecology ; Vertebrate Zoology ; Vertebrates: general zoology, morphology, phylogeny, systematics, cytogenetics, geographical distribution
Is Part Of: Aquatic living resources (Montrouge), 2013-01, Vol.26 (1), p.63-68
Description: Several pelagic fish species are known to associate with floating objects. However, quantitative information on the main factors that drive this associative behaviour is still lacking. Small pelagic fish offer a particularly interesting case study for this phenomenon, since the small spatial scales involved in their association with floating objects allow experimental data to be collected at a fine scale. Here, we monitored twelve acoustically-tagged bigeye scads, Selar crumenophthalmus (Carangidae), (mean fork length 16.4 cm, SD 2.1 cm) around a floating object moored in shallow water (15 m depth) playing the role of a coastal fish aggregating device (FAD). To quantify the role played by variations in current and daylight, we calculated the speed distribution, pair correlation function and group polarization for the tagged fish hourly, from midday to dusk (13:00–18:00), for varying current strengths and daylight conditions. We found that the current induced a shift in the position of the aggregation upstream of the FAD, at distances that increased with the current strength. We found evidence of an expansion and a higher coordination in the aggregation at dusk, with increasing speed, distance among conspecifics and alignment. We discuss possible scenarios in which group polarization increases at dusk and suggest complementary measurements for future experiments that could confirm our findings.
Publisher: Paris: EDP Sciences
Language: English;French;Spanish
Identifier: ISSN: 0990-7440
EISSN: 1765-2952
DOI: 10.1051/alr/2012025
CODEN: ALREEA
Source: EDP Open
Hyper Article en Ligne (HAL) (Open Access)
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Effect of current and daylight variations on small-pelagic fish aggregations (Selar crumenophthalmus) around a coastal fish aggregating device studied by fine-scale acoustic tracking

2014 INIST-CNRS ;EDP Sciences, IFREMER, IRD 2012 ;Distributed under a Creative Commons Attribution 4.0 International License ;ISSN: 0990-7440 ;EISSN: 1765-2952 ;DOI: 10.1051/alr/2012025 ;CODEN: ALREEA

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