Spatial and temporal analysis (2009–2020) of the biological parameters, abundance and distribution of Trachurus mediterraneus (Steindachner, 1868) in the Western Mediterranean

Rodríguez-Castañeda, José Carlos; Ventero, Ana; García-Márquez, Manuela Gertrudis; Iglesias, M.

doi:10.1016/j.fishres.2022.106483

Cited by 5 publications

(4 citation statements)

References 37 publications

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“…Recent investigations conducted in the Northwestern (NW) Mediterranean Sea revealed a decline in some life history traits of relevant small and medium pelagic shes, i.e., Sardina pilchardus, Engraulis encrasicolus and Trachurus mediterraneus (Albo-Puigserver et al 2021;Rodríguez-Castañeda et al 2022). Their results suggest the existence of phenotypic adaptive responses with changes in the size at rst maturity, fecundity, condition factor and age structure possibly promoted by the current exploitation of stocks and the in uence of environmental conditions.…”

Section: Introductionmentioning

confidence: 97%

“…Most catches of this species in the Mediterranean come from Turkey, Sea of Marmara, and western Black Sea, however, the different stocks are currently declining possibly due to shing pressure and poor recruitment (Smith-Vaniz et al 2015). In the Mediterranean, T. trachurus populations from the Alboran and Black Sea have severely reduced, being considered fully exploited, while populations in the northeastern Atlantic and Turkey are deemed to be overexploited, thus, the species is globally listed as "vulnerable" in the IUCN Red List of Threatened Species (Smith-Vaniz et al 2015).Recent investigations conducted in the Northwestern (NW) Mediterranean Sea revealed a decline in some life history traits of relevant small and medium pelagic shes, i.e., Sardina pilchardus, Engraulis encrasicolus and Trachurus mediterraneus (Albo-Puigserver et al 2021;Rodríguez-Castañeda et al 2022). Their results suggest the existence of phenotypic adaptive responses with changes in the size at rst maturity, fecundity, condition factor and age structure possibly promoted by the current exploitation of stocks and the in uence of environmental conditions.…”

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confidence: 99%

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Analysis of the state of conservation of Trachurus trachurus in the Western Mediterranean Sea based on the interannual (2009-2020) changes in their life history traits.

Rodriguez-Castañeda,

Ventero,

Iglesias

2023

Preprint

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Horse mackerel is a semi-pelagic fish widely distributed in the eastern Atlantic, where it represents a species of interest for fisheries and is subject to intense exploitation, leading to its global classification as a vulnerable species by IUCN. In the Northwestern (NW) Mediterranean Sea, the knowledge of their distribution, abundance and main biological parameters is fundamental to achieve their sustainable exploitation and contribute to the ecosystem approach to fisheries management. The time series (2009–2020) data set analyzed in this study came from two geographical subareas (GSAs) defined by the General Fisheries Commission for the Mediterranean (GFCM), Northern Spain (GSA06) and Northern Alboran Sea (GSA01) sampled in July during the MEDiterranean International Acoustic Survey (MEDIAS). Our results suggest that in summer, a higher concentration and aggregation of fish exists in GSA01, with a density ten times greater than in GSA06. Possible life history changes can be inferred through the analysis of the biological parameters of Trachurus trachurus in the NW Mediterranean Sea. In both GSAs, the annual decline of the size at first maturity (L50) and condition factor (Kn) was prominent. Moreover, the population structure lacked adult modes that could guarantee a successful recuperation of future stocks. Nonetheless, fish inhabiting GSA01 seem to have a better adaptive response to the events responsible for these alterations. In comparison, GSA01 is under less fishing pressure and the upwelling occurring in this area contributes to a higher availability of food, in addition to reducing the increases in sea surface temperature due to climate change during the study period.

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Section: Introductionmentioning

confidence: 97%

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confidence: 99%

Analysis of the state of conservation of Trachurus trachurus in the Western Mediterranean Sea based on the interannual (2009-2020) changes in their life history traits.

Rodriguez-Castañeda,

Ventero,

Iglesias

2023

Preprint

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“…Length correlates with many attributes of the organism. It is crucial in monitoring evolutionary and ecological consequences of size‐selective harvesting (Fenberg & Roy, 2008; Neumann & Allen, 2007; Rodríguez‐Castañeda et al, 2022; Uusi‐Heikkilä, 2020) and can be used as a proxy of metabolic rates and maintenance metabolism to help identify initiation of reproduction (Chen et al, 2022). Weight, as it correlates with the size of the ovary and the number of ova, has been identified as one of the most cost‐efficient indicator of fecundity (Ahti et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Fish condition as an indicator of stock status: Insights from condition index in a food‐limiting environment

2023

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Individual performance defines population dynamics. Condition index -a ratio of weight and some function of length -has been louded as an indicator of individual performance and recommended as a tool in fisheries management and conservation.However, insufficient understanding of the correlation between individual-level processes and population-level responses hinders its adoption. To this end, we use composite modelling to link individual's condition, expressed through the condition index, to population-level status. We start by modelling ontogeny of European pilchard (Sardina pilchardus, Clupeidae) as a function of food and constant temperature using Dynamic Energy Budget theory. We then provide a framework to simultaneously track the individual-and population-level statistics by incorporating the dynamic energy budget model into an individual-based model. Lastly, we explore the effects of fishing pressure on the statistics in two constant and food-limited environmental carrying capacity scenarios. Results show that, regardless of the species' environmental carrying capacity, individual condition index will increase with fishing mortality, that is, with reduction of stock size. Same patterns are observed for gilthead seabream (Sparus aurata, Sparidae), a significantly different species. Condition index can, therefore, in food-limited populations, be used to (i) estimate population size relative to carrying capacity and (ii) distinguish overfished from underfished populations. Our findings promote a practical way to operationally incorporate the condition index into fisheries management and marine conservation, thus providing additional use for the commonly collected biometric data. Some real-world applications, however, may require additional research to account for other variables such as fluctuating environmental conditions and individual variability.

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“…A commonly used length-based index of growth performance is f' (Pauly and Munro 1984), which is a species-specific index used to compare reliability of vB parameters between and within species or stocks (Etim et al 1999, Moura et al 2017. The growth performance parameter f' has found widespread use in comparing integral performance of vB growth curves (Quaas and Skonhoft 2022, Rodríguez-Castañeda et al 2022, Şimşek et al 2022.…”

Section: Introductionmentioning

confidence: 99%

Effects of misrepresentative length samples on individual growth and stock condition estimates

Villa-Diharce

Cisneros-Mata

Ramírez-Félix

2023

scimar

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Despite its importance in fisheries studies, there is insufficient understanding on the effect of sampling error or bias on individual growth and other stock indicators. We show the influence of sample length distributions on parameter estimates, illustrating with an example. For the brown swimming crab, we simulated length samples in five configurations and estimated parameters of von Bertalanffy (k, L∞L∞ , t0), asymptotic weight ( W∞W∞ ), weight-length relationship (a, b), growth performance (ϕ’) and condition factor (Kn). Parameter estimates were compared with baseline values using relative bias, standard error and root mean square error. The results show that the accuracy and bias of parameter estimates depend on the lengths sampled. For example, the bias and accuracy of L∞L∞ and W∞W∞ vary inversely with sampled length, whereas combining length segments yields smaller biases of k and t0 than those of L∞L∞ and W∞W∞ . In general, the accuracy of parameter estimates does not always depend on sampling the entire length range, and errors are not the same for all parameters. These results are useful to guide sampling when resources are scarce. We discuss potential reasons for incomplete length sample structure and offer recommendations to obtain best estimates for parameters of interest.

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Spatial and temporal analysis (2009–2020) of the biological parameters, abundance and distribution of Trachurus mediterraneus (Steindachner, 1868) in the Western Mediterranean

Cited by 5 publications

References 37 publications

Analysis of the state of conservation of Trachurus trachurus in the Western Mediterranean Sea based on the interannual (2009-2020) changes in their life history traits.

Analysis of the state of conservation of Trachurus trachurus in the Western Mediterranean Sea based on the interannual (2009-2020) changes in their life history traits.

Fish condition as an indicator of stock status: Insights from condition index in a food‐limiting environment

Effects of misrepresentative length samples on individual growth and stock condition estimates

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