A comparison of spring body condition, maturation status, and diet in the European sardine,<i>Sardina pilchardus</i>(Teleostei: Clupeidae) from contrasting environments off the Moroccan Atlantic coast

Mghazli, Hayat El; Mounir, Abdelaziz; Znari, Mohammed; Naïmi, Mohamed; Ouizgani, Hassan El; Aourir, Mohamed

doi:10.1080/17451000.2020.1817489

Cited by 3 publications

(2 citation statements)

References 31 publications

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“…These correlation analysis results allowed us to propose that fluctuations in the environment play a major role in the abundance of the chub mackerel stock, which showed that the abundance of this harvested stock population continued to increase until 2017; then, a slight decrease was observed in 2018, indicating that the evolution of this stock can follow changes in the environmental factors mainly related to the upwelling intensity that also changed during those years [60].…”

Section: Environmental Effect On Chub Mackerel Abundance Variabilitymentioning

confidence: 81%

Stochastic Modelling to Assess External Environmental Drivers of Atlantic Chub Mackerel Population Dynamics

et al. 2022

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The population dynamics of small and middle-sized pelagic fish are subject to considerable interannual and interdecadal fluctuations in response to fishing pressure and natural factors. However, the impact of environmental forcing on these stocks is not well documented. The Moroccan Atlantic coast is characterized by high environmental variability due to the upwelling phenomenon, resulting in a significant abundance and variation in the catches of small and middle-sized pelagic species. Therefore, understanding the evolution of stock abundance and its relationship with different oceanographic conditions is a key issue for fisheries management. However, because of the limited availability of independent-fishery data along the Moroccan Atlantic coast, there is a lack of knowledge about the population dynamics. The main objective of this study is to test the correlation between the environment conditions and the stock fluctuations trends estimated by a stock assessment model that does not need biological information on growth, reproduction, and length or age structure as input. To achieve this objective, the fishery dynamics are analyzed with a stochastic surplus production model able to assimilate data from surveys and landings for a biomass trend estimation. Then, in a second step, the model outputs are correlated with different environmental (physical and biogeochemical) variables in order to assess the influence of different environmental drivers on population dynamics. This two-step procedure is applied for chub mackerel along the Moroccan coast, where all these available datasets have not been used together before. The analysis performed showed that larger biomass estimates are linked with periods of lower salinity, higher chlorophyll, higher net primary production, higher nutrients, and lower subsurface oxygen, i.e., with an enhanced strength of the upwelling. In particular, acute anomalies of these environmental variables are observed in the southern part presumably corresponding to the wintering area of the species in the region. The results indicate that this is a powerful procedure, although with important limitations, to deepen our understanding of the spatiotemporal relationships between the population and the environment in this area. Moreover, once these relationships have been identified, they could be used to generate a mathematical relationship to simulate future population trends in diverse environmental scenarios.

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Section: Environmental Effect On Chub Mackerel Abundance Variabilitymentioning

confidence: 81%

Stochastic Modelling to Assess External Environmental Drivers of Atlantic Chub Mackerel Population Dynamics

et al. 2022

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“…Furthermore, biological factors such as food availability or parasites have been proposed as potential agents behind the drop in condition in fish. Studies have pointed at the productivity and composition of the zooplankton to be related to sardine status ( El Mghazli et al, 2020 ; Mercado et al, 2007 ). However, a gap of information is found regarding the relationship between nematode parasitism and this small pelagic.…”

Section: Introductionmentioning

confidence: 99%

Ascaridoid parasites in European sardine throughout the annual cycle: Variability in parasitic load according to host stock features

Caballero‐Huertas¹,

Palomba²,

Frigola‐Tepe³

et al. 2023

International Journal for Parasitology: Parasites and Wildlife

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Trophic level, niche width, and site fidelity of Moroccan forage fish in two contrasting upwelling systems

Masski,

Giménez,

de Stephanis

et al. 2024

Estuarine, Coastal and Shelf Science

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A comparison of spring body condition, maturation status, and diet in the European sardine,Sardina pilchardus(Teleostei: Clupeidae) from contrasting environments off the Moroccan Atlantic coast

Cited by 3 publications

References 31 publications

Stochastic Modelling to Assess External Environmental Drivers of Atlantic Chub Mackerel Population Dynamics

Stochastic Modelling to Assess External Environmental Drivers of Atlantic Chub Mackerel Population Dynamics

Ascaridoid parasites in European sardine throughout the annual cycle: Variability in parasitic load according to host stock features

Trophic level, niche width, and site fidelity of Moroccan forage fish in two contrasting upwelling systems

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