How the fishing effort control and environmental changes affect the sustainability of a tropical shrimp small scale fishery

Lira, Alex Souza; Lucena‐Frédou, Flávia; Loc’h, François Le

doi:10.1016/j.fishres.2020.105824

Cited by 20 publications

(11 citation statements)

References 122 publications

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“…Although the Brazilian northeastern coast covers an extensive area and encompasses a wide range of environments, few studies of coastal trophic structure have been carried out, often focusing only on describing qualitatively and quantitatively the diet [ 47 – 50 ], and in the functioning of the ecosystem [ 51 – 53 ]. Even of great importance, the probable effect of the “disturbance” in the trophic web by fishing, especially those with high impact in the ecosystem (e.g., bottom trawling), has never been focused.…”

Section: Introductionmentioning

confidence: 99%

Trophic structure of a nektobenthic community exploited by a multispecific bottom trawling fishery in Northeastern Brazil

et al. 2021

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We used complementary stable isotope (SIA) and stomach content (SCA) analyses to investigate feeding relationships among species of the nektobenthic communities and the potential ecological effects of the bottom trawling of a coastal ecosystem in northeastern Brazil. Carbon (δ13C) and nitrogen (δ15N) compositions were determined for five basal sources and 28 consumers, from zooplankton to shrimp and fish species. Fishes and basal sources showed a broad range of δ15N (fishes: 6.49–14.94‰; sources: 2.58–6.79‰) and δ13C values (fishes: -23.86 to -13.71‰; sources: -24.32 to -13.53‰), while shrimps and crabs exhibited similar nitrogen and carbon ratios. Six trophic consumer groups were determined among zooplankton, crustaceans and fishes by SIA, with trophic pathways associated mostly with benthic sources. SCA results indicated a preference for benthic invertebrates, mainly worms, crabs and shrimps, as prey for the fish fauna, highlighting their importance in the food web. In overall, differences between SCA and the SIA approaches were observed, except for groups composed mainly for shrimps and some species of high δ15N values, mostly piscivorous and zoobenthivores. Given the absence of regulation for bottom trawling activities in the area, the cumulative effects of trawling on population parameters, species composition, potentially decreasing the abundance of benthic preys (e.g., shrimps, worms and crabs) may lead to changes in the trophic structure potentially affect the food web and the sustainability of the fishery.

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Section: Introductionmentioning

confidence: 99%

Trophic structure of a nektobenthic community exploited by a multispecific bottom trawling fishery in Northeastern Brazil

et al. 2021

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“…Jiang et al (2009) also showed that after a fishing moratorium, the community tends to be dominated by fast-growing small groups, which facilitates the expansion of fish in the community. Small fishes also play a considerable role in bridging the low and high TLs (Lira et al, 2021).…”

Section: Analysis Of the Variations In The East China Sea Ecosystem S...mentioning

confidence: 99%

“…Aquatic products are a primary protein source for humans (Lira et al, 2021). As such, global marine capture production had reached 92.51 million tons by 2017, with an average increase of 10-fold relative to 1950, resulting in the catch per unit effort declining by 50% to 80% (Zhou et al, 2015;Link and Watson, 2019).…”

Section: Introductionmentioning

confidence: 99%

Estimating the Impact of a Seasonal Fishing Moratorium on the East China Sea Ecosystem From 1997 to 2018

Song

Wang

et al. 2022

Front. Mar. Sci.

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Fisheries management policies (FMPs) have been implemented in coastal countries to ensure a sustainable supply of seafood and the recovery of species diversity. Because of the depletion of fishery stocks, China has introduced a series of FMPs since 1995, including a seasonal fishing moratorium (SFM), a zero-growth strategy, and a minimum mesh size for fishing nets. Here, we built two mass balance models for 1997–2000 (M1997) and 2018–2019 (M2018) using Ecopath with Ecosim 6.6 to illustrate the interannual changes over the past two decades in the East China Sea (ECS). We then simulated two dynamic scenarios from 1997 to 2018, SFM (M2018SFM) and no SFM (M2018no-SFM), to test the role of the SFM under fishing pressure in the ECS. Ecopath showed that the ECS ecosystem is becoming more mature, although it is still unstable, featuring lower total primary production/total respiration, longer cycles, faster organic material circulation speed, and a higher omnivorous degree. This suggests a slow recovery for the ECS ecosystem in the past two decades. The biomass of fish in the ECS—especially the planktivores, dominated by small-sized Benthosema pterotum—significantly increased in M2018 versus M1997, but there were fewer medium- and large-sized fish. The keystone species switched from the planktivores/piscivores dominated by Decapterus maruadsi in M1997 to planktivores in M2018. Ecosim illustrated that the SFM has positive effects on fishery resources recovery, especially for commercial fishes (i.e., large yellow croakers and hairtails), as reflected by the significantly higher predicted biomass of fish in M2018SFM compared to M2018no-SFM and M1997, although the bioaccumulation was consumed by the intense fishing pressure after the SFM. However, the M2018SFM prediction for nektons was still lower than the actual value, especially for planktivores, which display a sharp increase in biomass. This should be partly attributable to the policy of the minimum mesh size (<5 cm was banned), which benefits B. pterotum due to its 3.5 cm maximum body size. Therefore, a series of FMPs, rather than only the SFM, functioned together in the ECS ecosystem. However, the mixed trophic impact indicated a negative impact if the fisheries were further developed. Fishery management in the ECS needs to be strengthened by extending the SFM and reducing fishing pressure after the SFM.

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“…Correlation (Spearman's coefficient) of the Trophic Level (TL) estimated by Ecopath with the nitrogen stable isotope composition (δ 15 N), considered a proxy of TLs, were examined, taking into account 17 functional groups of the SCC model. This approach has been used in previous studies (Deehr et al, 2014;Lira et al, 2018Lira et al, , 2021Milessi et al, 2010;Navarro et al, 2011). The isotope data collection and analysis are detailed in Supplementary Material Table S7.…”

Section: Data Sampling and Data Input For Each Compartmentmentioning

confidence: 99%

Effect of fishing effort on the trophic functioning of tropical estuaries in Brazil

Lira

Lucena‐Frédou

Lacerda³

et al. 2022

Estuarine, Coastal and Shelf Science

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How the fishing effort control and environmental changes affect the sustainability of a tropical shrimp small scale fishery

Cited by 20 publications

References 122 publications

Trophic structure of a nektobenthic community exploited by a multispecific bottom trawling fishery in Northeastern Brazil

Trophic structure of a nektobenthic community exploited by a multispecific bottom trawling fishery in Northeastern Brazil

Estimating the Impact of a Seasonal Fishing Moratorium on the East China Sea Ecosystem From 1997 to 2018

Effect of fishing effort on the trophic functioning of tropical estuaries in Brazil

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