Studying the contribution of different fishing gears to the <i>Sardinella</i> small-scale fishery in Senegalese waters

Diankha, Ousmane; Demarcq, Hervé; Fall, Moussa; Thiao, Djiga; Thiaw, Modou; Sow, Bamol Ali; Gaye, Amadou Thierno; Brehmer, Patrice

doi:10.1051/alr/2017027

Cited by 13 publications

(21 citation statements)

References 29 publications

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“…In the waters of Senegal, which are located at the southern tip of the CCLME, small pelagic fishes are exploited intensively by artisanal fleets and dominate fishery landings by volume and value (Diankha et al, ). The bonga shad Ethmalosa fimbriata (Bowdich, 1825) is the third‐most commercially important clupeid species for the fisheries along the southern coast of Senegal (after round sardinella Sardinella aurita and madeiran sardinella S. maderensis also known as flat sardinella) (Baldé et al, ), with catches reaching 18,400 tons in 2015 (Thiao, Sow, Thiam, Fall, & Thiam, ).…”

Section: Introductionmentioning

confidence: 99%

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

Baldé

Döring

Ekau

et al. 2019

Fisheries Oceanography

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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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Section: Introductionmentioning

confidence: 99%

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

Baldé

Döring

Ekau

et al. 2019

Fisheries Oceanography

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“…Round sardinella ( Sardinella aurita ) and flat sardinella ( Sardinella maderensis ), the only Sardinella sampled in the Senegalese area, account for more than 80% of the Senegalese artisanal fisheries total landings (Diankha et al., ; FAO, ), which are marked by strong seasonal and interannual fluctuations (Thiaw et al., ). Both species have short‐lived, zooplankton feeders with similar shape and size (maximum fork length ~30 cm; Ba et al., ), and occupy almost the same geographical areas over the Senegalese continental shelf (Cury & Fontana, ).…”

Section: Introductionmentioning

confidence: 99%

Contrasted optimal environmental windows for both sardinella species in Senegalese waters

Diankha

Bâ

Brehmer

et al. 2018

Fisheries Oceanography

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We investigate Sardinella aurita and Sardinella maderensis recruitment success relative to the variability of oceanographic conditions in Senegalese waters using generalized additive models (GAM). Results show that recruitment of both species is marked by a strong intra‐annual (seasonal) variation with minimum and maximum in winter and summer, respectively. Their interannual variations are synchronous until 2006 (recruitment decreasing), while from 2007 there is no synchrony. The model developed shows that sardinella recruitment variability is closely related to the tested environmental variables in the study area. However, the key environmental variables influencing the recruitment success are different for both species: the Coastal Upwelling Index and the sea surface temperature for S. aurita and S. maderensis, respectively. We report that recruitment success of S. aurita and S. maderensis are associated with distinct ranges of sea surface temperature, upwelling intensity, wind‐induced turbulence, concentration of chlorophyll‐a and north Atlantic oscillation index. Considering food security and socio‐economic importance of both stocks, we recommend that consideration is given to the environmental variability in the small pelagic fish national management plans, particularly in the context of climate change.

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“…Fishers’ harvesting decisions are affected by climatic conditions, prices for fish, fuel and labor, technological progress, and the stock level. We use a similar economic dataset to previous studies [58, 59]. We model purse seines targeting Sardinella aurita in four Senegalese regions, namely, Thiès Sud, Thiès Nord, Fleuve, and the Dakar peninsula called Cap Vert, and we aggregate the results afterwards.…”

Section: Methodsmentioning

confidence: 99%

Climate change adaptation and the role of fuel subsidies: An empirical bio-economic modeling study for an artisanal open-access fishery

et al. 2019

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Climate change can severely impact artisanal fisheries and affect the role they play in food security. We study climate change effects on the triple bottom line of ecological productivity, fishers’ incomes, and fish consumption for an artisanal open-access fishery. We develop and apply an empirical, stochastic bio-economic model for the Senegalese artisanal purse seine fishery on small pelagic fish and compare the simulated fishery’s development using four climate projections and two policy scenarios. We find that economic processes of adaptation may amplify the effects of climate variations. The regions’ catch potential increases with climate change, induced by stock distribution changes. However, this outcome escalates over-fishing, whose effects outpace the incipiently favorable climate change effects under three of the four climate projections. Without policy action, the fishery is estimated to collapse in 2030–2035 on average over 1000 runs. We propose an easily implementable and overall welfare-increasing intervention: reduction of fuel subsidies. If fuel subsidies were abolished, ecological sustainability as well as the fishery’s welfare contribution would increase regardless of the climate projection.

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Studying the contribution of different fishing gears to the Sardinella small-scale fishery in Senegalese waters

Cited by 13 publications

References 29 publications

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

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

Contrasted optimal environmental windows for both sardinella species in Senegalese waters

Climate change adaptation and the role of fuel subsidies: An empirical bio-economic modeling study for an artisanal open-access fishery

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