Bonga shad ( Ethmalosa fimbriata ) spawning tactics in an upwelling environment

Type Article
Date 2019-11
Language English
Author(s) Baldé Bocar Sabaly1, 2, 3, Döring Julian4, Ekau Werner4, Diouf Malick3, Brehmer Patrice1, 2
Affiliation(s) 1 : Institut Sénégalais de Recherche Agricole (ISRA), Centre de Recherches Océanographiques de Dakar‐Thiaroye (CRODT) Centre PRH Dakar ,Sénégal
2 : IRD, Univ Brest, CNRS, Ifremer Lemar Plouzané, France
3 : Institut Universitaire de Pêche et d'Aquaculture Université Cheikh Anta Diop (UCAD) Dakar ,Sénégal
4 : Leibniz Centre for Tropical Marine Research (ZMT) Bremen, Germany
Source Fisheries Oceanography (1054-6006) (Wiley), 2019-11 , Vol. 28 , N. 6 , P. 686-697
DOI 10.1111/fog.12451
WOS© Times Cited 3
Keyword(s) climate change, clupeid, data-poor fisheries, fecundity, optimal environmental window, reproductive adaptation, small pelagic fish
Abstract

Successful recruitment in small pelagic fish populations inhabiting upwelling zones is subject to variation in fecundity and is driven by spatial and temporal fluctuations in environmental conditions, that is, mainly sea surface temperature, salinity and food availability. These fluctuations in abiotic factors have stimulated small pelagic fish populations to exhibit specifically adapted spawning tactics. To better understand to what extent a short‐lived exploited fish species such as bonga shad Ethmalosa fimbriata has adapted to an upwelling environment, we have investigated the interrelationship between upwelling intensity as a proxy for productivity and population fecundity by means of a virtual population analysis. We found that females of intermediate size contributed significantly more eggs to the population's fecundity than smaller or larger ones. Our model results further indicate that E. fimbriata exhibits a spawning preference at water temperatures of around 25°C and upwelling intensities of around 2.5 m3 s−1 m−1. Hence, we hypothesize that climate change‐driven increases in sea temperatures and modifications of upwelling‐favourable winds could significantly impact the species’ reproductive biology. To understand how climate change might impact fisheries, spawning tactics of small pelagic fishes are important to assess as well as their recruitment success. Such information is particularly relevant in countries where the fishery is critical at socio‐economic level, to better implement fisheries management addressing multiple stressors.

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