The need for a protean fisheries science to address the degradation of exploited aquatic ecosystems

Drouineau, Hilaire; Lobry, Jérémy; Bez, Nicolas; Travers-Trolet, Morgane; Vermard, Youen; Gascuel, Didier

doi:10.1051/alr/2016021

Cited by 3 publications

(2 citation statements)

References 64 publications

(59 reference statements)

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“…At last, the last component is the overexploitation of natural resources (Brook et al., ). For example, fisheries have had major impacts on marine ecosystems, depleting stocks with potential impacts on fishing food webs, and impacts on habitats because of destructive fishing gear (Branch, ; Christensen et al., ; Drouineau, Lobry, et al., ; Gascuel et al., ; Turner, Thrush, Hewitt, Cummings, & Funnell, ). Fisheries have also shaped the life histories of exploited fishes by acting as a permanent and continuous selection pressure (Heino, Pauli, & Dieckmann, ; Jørgensen & Renöfält, ).…”

Section: Introductionmentioning

confidence: 99%

Freshwater eels: A symbol of the effects of global change

Drouineau

Durif

Castonguay³

et al. 2018

Fish and Fisheries

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117

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Temperate eels Anguilla anguilla (European eel), A. rostrata (American eel) and A. japonica (Japanese eel) are three catadromous species which have been declining since the 1970s/1980s despite their remarkable adaptive capacity. Because of their specific life cycles, which share distant oceanic spawning grounds and continental growth stage, eels are affected by five components of the global change: (a) climate change affecting larval survival and drift, (b) an increase in pollution leading to high levels of contamination exacerbated by their high lipid levels, (c) increasing fragmentation and habitat loss that reduce dramatically the amount of available habitats and induce increased spawner mortality, (d) the appearance of Anguillicola crassus a parasitic alien nematode that impairs spawning success, and (e) the impact of commercial and recreational fisheries for all life stages of eel. In this context, the rapid increases of pressures during the “Great Acceleration” have surpassed the adaptive capacity of eels. This illustrates that cumulative effects of global change can lead to the collapse of species, even in species that have amazingly high adaptive capacities.

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Section: Introductionmentioning

confidence: 99%

Freshwater eels: A symbol of the effects of global change

Drouineau

Durif

Castonguay³

et al. 2018

Fish and Fisheries

Self Cite

117

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“…This model consistency reveals high model precision and provides some additional confidence in our stock assessment results. However, there still may be unaccounted‐for sources of uncertainty (i.e., “unknown unknowns”; Drouineau et al 2016) that could affect model accuracy.…”

Section: Discussionmentioning

confidence: 99%

Rapid approach for assessing an unregulated fishery using a series of data‐limited tools

Gervasi,

Karnauskas,

Rios

et al. 2023

Mar Coast Fish

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ObjectiveFisheries provide countless benefits to human populations but face many threats ranging from climate change to overfishing. Despite these threats and an increase in fishing pressure globally, most stocks remain unassessed and data limited. An abundance of data‐limited assessment methods exists, but each has different data requirements, caveats, and limitations. Furthermore, developing informative model priors can be difficult when little is known about the stock, and uncertain model parameters could create misleading results about stock status. Our research illustrates an approach for rapidly creating robust initial assessments of unregulated and data‐limited fisheries without the need for additional data collection.MethodsOur method uses stakeholder knowledge combined with a series of data‐limited tools to identify an appropriate stock assessment method, conduct an assessment, and examine how model uncertainty influences the results. Our approach was applied to the unregulated and data‐limited fishery for Crevalle Jack Caranx hippos in Florida.ResultResults suggested a steady increase in exploitation and a decline in stock biomass over time, with the stock currently overfished and undergoing overfishing. These findings highlight a need for management action to prevent continued stock depletion.ConclusionOur approach can help to streamline the initial assessment and management process for unregulated and data‐limited stocks and serves as an additional tool for combating the many threats facing global fisheries.

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Nutrients’ distribution and their impact on Pangani River Basin’s ecosystem – Tanzania

Selemani

Zhang

Muzuka

et al. 2017

Environmental Technology

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Surface and groundwater from Pangani River Basin (PRB) were sampled in dry and wet seasons, analysed for dissolved organic and inorganic nutrients (N, P, Si and Urea). There was spatial and seasonal nutrients' variability, with enrichment of dissolved inorganic fractions accumulated from natural and anthropogenic sources. Silicates increased in dry season, whereas nitrate, ammonium, phosphate and urea increased in wet season; except for phosphate, other nutrients increased from upstream to the river mouth. High rate of chemical weathering possibly due to tropical climate and volcanic rocks has caused PRB to have higher concentration of silicates than average freshwater African Rivers. Contribution of PRB to the coast of Indian Ocean was 2.6, 39.0, 45.2, 67.4 and 5444.8 (mol/km/yr) for nitrite, phosphate, ammonium, nitrate and silicates, respectively, which were lower than most of the tropical rivers in the world. Levels of nitrate and phosphate for most of the stations were higher than recommended levels for aquatic ecosystem health. Furthermore, observed hypoxia condition in some stations threatens aquatic life. This study recommends the efficient use of fertilizers to reduce nutrients' uptake into the lakes and rivers so as to meet the recommended level for aquatic and human health.

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The need for a protean fisheries science to address the degradation of exploited aquatic ecosystems

Cited by 3 publications

References 64 publications

Freshwater eels: A symbol of the effects of global change

Freshwater eels: A symbol of the effects of global change

Rapid approach for assessing an unregulated fishery using a series of data‐limited tools

Nutrients’ distribution and their impact on Pangani River Basin’s ecosystem – Tanzania

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