Acoustic characterisation of micronekton distribution in French Polynesia

Bertrand, Arnaud; Borgne, Robert Le; Josse, Erwan

doi:10.3354/meps191127

Cited by 51 publications

(32 citation statements)

References 42 publications

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“…Even if any doubt remains about the influence of fish-luring light, the dominant stomach contents of the recaptured fish were lantern fish and squid (Table 1). These species are reported to form a sound scattering layer (SSL) and showed the same diurnal vertical migration as tuna (Bertrand et al 1999). Josse et al (1998) indicated the important role of the SSL, assimilated as food, in vertical and horizontal tuna movements, during daytime and night time.…”

Section: Discussionmentioning

confidence: 99%

Schooling behavior of juvenile yellowfin tunaThunnus albacaresaround a fish aggregating device (FAD) in the Philippines

Mitsunaga

Endo

Babaran

2012

Aquat. Living Resour.

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-A fish aggregating device (FAD) called a payao is conventionally installed to catch pelagic species in the Philippines. The waters around the Philippines are important regions for yellowfin tuna stocks because they include spawning grounds and nurseries. To understand the schooling behavior of juvenile yellowfin tuna Thunnus albacares around a payao, 13 juveniles (20.5−24.0 cm fork length) double tagged with ultrasonic transmitters (V7-2L-R256; Vemco Ltd.) and data loggers (DST-micro; Star-Oddi Ltd.) were released around a payao. A self-recording receiver (VR2-DEL; Vemco Ltd.) was attached on the mooring rope of the payao to follow the horizontal movements and data loggers recorded the vertical movements of tagged juveniles. Nine juveniles were recaptured simultaneously by ring net at the same payao after 4-7 days. One juvenile was recaptured by hand line at another payao 12 km away from the tagging site after 6 days. Recaptured juveniles showed a diurnal schooling pattern suggesting different school shape and foraging strategy between daytime and nighttime. Juveniles showed a diurnal horizontal moving pattern, concentrated near the payao during daytime, while they were distributed around the payao at nighttime. The fluctuations of swimming depth were synchronized among fish. Juveniles also showed a diurnal vertical movement pattern in surface mixed layer. They concentrated in a shallow and narrow range (11.2 ± 8.2 m, mean ± SD) at nighttime, while they were distributed to a deep and wide range (20.0 ± 11.8 m) during daytime. The maximum vertical neighbor distance indicated the vertical thickness of the school and showed a peak around noon. Higher vertical movement speed during daytime indicated vertical foraging in a water column, while at nighttime the juveniles might forage horizontally following the diurnal migration patterns of prey in the surface layer.

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Section: Discussionmentioning

confidence: 99%

Schooling behavior of juvenile yellowfin tunaThunnus albacaresaround a fish aggregating device (FAD) in the Philippines

Mitsunaga

Endo

Babaran

2012

Aquat. Living Resour.

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“…The pattern was stronger when surface phytoplankton biomass was higher, which was the case during OUTPACE due to the high contribution of diazotrophs at this season. In the W-MA and CE-MA regions, copepods dominated the mesozooplankton taxonomic structure, but the sampling of teleost eggs and juveniles of euphausiaceae, although certainly under-sampled with our bongo net, do indicate the presence of higher trophic levels in deeper waters in this region (Roger et al 1994;Bertrand et al, 1999). 20…”

Section: Estimation Of the Trophic Interactions Between Mesozooplanktmentioning

confidence: 99%

Mesozooplankton structure and functioning in the western tropical South Pacific along the 20° parallel south during the OUTPACE survey (February–April 2015)

Carlotti¹,

Pagano²,

Guilloux³

et al. 2018

Preprint

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Abstract.This paper presents new results on spatial and temporal distribution patterns of mesozooplankton in the western 20 tropical South Pacific along the 20°S south visited during austral summer (February -April 2015). By contributing to the interdisciplinary OUTPACE (Oligotrophy to UlTra-oligotrophy PACific Experiment) project (Moutin et al., 2017), the specific aims of this study dedicated to mesozooplankton observations were (1) to document zooplankton density, species diversity, and biomass along the transect, and (2) to characterize the trophic pathways from primary production to mesozooplankton . Along a West-East transect of 4000 km from New Caledonia to the French Polynesia, 15 short-duration 25 stations (SD-1 to SD-15, 8hours each) dedicated to a large-scale description, and three long-duration stations (LD-A to LD-C, 5days each), respectively positioned (1) in offshore northern waters of New Caledonia, (2) near Niue Island, and (3) in the subtropical Pacific gyre near the Cook Islands, were sampled with a Bongo Net with 120 μm mesh size net for quantifying mesozooplankton abundance, biomass, community taxonomy and size structure, and size fractionated content of δ Daily grazing pressure on phytoplankton stocks and daily regeneration by zooplankton were as well estimated for the different regions showing contrasted impacts between MA and GY regions. For the 3 LD stations, it was not possible to find any relationship between the abundance and biomass in the water column and swimmers found in sediment traps. Diel vertical migration of zooplankton, which obviously occurs from observed differences in day and night samples, might 25 strongly influence the community of swimmers in traps.Biogeosciences Discuss., https://doi

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“…The integration threshold was set at -80dB. At 38 kHz, s A is representative of the micronekton abundance (Bertrand et al 1999). Echograms graphically represent the acoustic back-scattered energy; micronekton aggregations can be tracked on echograms.…”

Section: Introductionmentioning

confidence: 99%

Mesoscale eddies influence distribution and aggregation patterns of micronekton in the Mozambique Channel

Sabarros¹,

Ménard²,

Levenez³

et al. 2009

Mar. Ecol. Prog. Ser.

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Oceanic mesoscale circulation is a crucial structuring force in the marine environment. Dynamic processes associated with eddies, such as eddy-induced upwelling or eddy-eddy interaction, drive the transport and distribution of nutrients that support the whole food chain, presumably through bottom-up processes. Eddies can shape the distribution of organisms at both low (phytoplankton, zooplankton and fish larvae) and high trophic levels (top fish predators, seabirds or turtles), but the impact of mesoscale features on intermediate trophic levels (micronekton) remains poorly understood. We analysed the influence of eddies on the distribution of micronekton aggregations in the Mozambique Channel by combining data from acoustic surveys and satellite sea topography. We demonstrated that large aggregations of micronekton occurred mainly in areas where the local horizontal gradient of sea level anomalies is strong, i.e. at the periphery of eddies. We observed that, in this region, eddies running along the coast advect coastal nutrient-rich waters at their edges, which support the base of the food chain. We propose that eddies can shape the distribution and the aggregation patterns of the prey of marine top predators through bottom-up processes.

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Acoustic characterisation of micronekton distribution in French Polynesia

Cited by 51 publications

References 42 publications

Schooling behavior of juvenile yellowfin tunaThunnus albacaresaround a fish aggregating device (FAD) in the Philippines

Schooling behavior of juvenile yellowfin tunaThunnus albacaresaround a fish aggregating device (FAD) in the Philippines

Mesozooplankton structure and functioning in the western tropical South Pacific along the 20° parallel south during the OUTPACE survey (February–April 2015)

Mesoscale eddies influence distribution and aggregation patterns of micronekton in the Mozambique Channel

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