Evaluating the role of endogenous and exogenous features on larval hake nutritional condition

Diaz, Marina V.; Souto, Marina Do; Betti, Paola; Temperoni, Brenda; Schiariti, Agustín; Machinandiarena, Laura; Brown, Daniel R.; Macchi, Gustavo J.

doi:10.1111/fog.12497

Cited by 5 publications

(1 citation statement)

References 49 publications

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“…It is evident that frontal systems play a fundamental role in the ecological processes of the ocean because they allow a high primary production, they are suitable areas for the reproduction and feeding of many nektonic species, they offer a suitable breeding environment for the feeding of the early stages of fish development, and they act as retention zones (Acha et al 2004). NPFS could also be an area with a high concentration of prey, predators and competitors of anchovy and hake eggs and larvae (Mianzan and Guerrero 2000, Álvarez-Colombo et al 2003, Diaz et al 2016, 2020.…”

Section: Discussionmentioning

confidence: 99%

RNA/DNA and derived condition indices for anchovy and hake larvae as relevant information for comprehensive fisheries management

Diaz

Souto

Cohen

et al. 2022

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The nutritional condition of anchovy and Argentine hake larvae in the Northern Patagonian Frontal System (NPFS) area was studied in the austral spring of 2018. We hypothesized that this area provides adequate features for larval growth and survival. The RNA/DNA index (RD) and its derived index of growth performance were employed. A critical RD value for starvation was calculated. The percentage of individuals under starvation and in optimal growth conditions was calculated. Because the period of study was the beginning of the hake spawning period, a limited number of larvae of this species were collected. The RD index showed a significant increase throughout larval ontogeny for anchovy larvae, being 1.84±1.39 (N=739) and 2.77±1.50 (N=220) in the pre-flexion and flexion stages respectively. These values were significantly higher at stations close to the NPFS and at the upper level of the water column. No differences were observed throughout the day. The area inside the NPFS showed a lower proportion of starved anchovy and a higher proportion of individuals in optimal growth, standing as a favourable nursing area. For hake larvae, the average RD was 1.64±0.55 (N=15). The great sensitivity of the RD index makes it a powerful tool for assessing the probability of larval survival and posterior recruitment into fisheries and allowing the identification of favourable rearing areas for these important species for fisheries.

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Section: Discussionmentioning

confidence: 99%

RNA/DNA and derived condition indices for anchovy and hake larvae as relevant information for comprehensive fisheries management

Diaz

Souto

Cohen

et al. 2022

scimar

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Intervention of re-feeding on growth performance, fatty acid composition and oxidative stress in the muscle of red swamp crayfish (Procambarus clarkii) subjected to short-term starvation

et al. 2021

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Contrasting distributional patterns of two co-occurring ctenophores in relation to ichthyoplankton and environmental features in the Southwestern Atlantic Ocean

Sobrero¹,

Chiaverano²,

Machinandiarena³

et al. 2023

Mar. Ecol. Prog. Ser.

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Assessing the ecological role of ctenophores is crucial to understanding ecosystem functioning, including the recruitment of fish stocks. During austral summer in the North Patagonia Ecosystem (NPE) (41-48°S), the ctenophores Mnemiopsis leidyi and Pleurobrachia pileus co-occur with the peak of ichthyoplankton abundance of 2 important fishing resources: the Argentine anchovy Engraulis anchoita and the Argentine hake Merluccius hubbsi, in association with a highly productive tidal front system. We analyzed 367 plankton samples collected in the NPE over 13 yr (2005-2018) to determine the abundance and spatial distribution of M. leidyi and P. pileus, their spatial overlap with ichthyoplankton (eggs and larvae of hake and anchovy), and their relationship with environmental features. Both ctenophore species displayed contrasting distributional patterns, associated with different physical environments, particularly temperature. M. leidyi showed a higher spatial overlap with ichthyoplankton compared to P. pileus. In addition, we found a significant negative correlation between the biomass of M. leidyi and the abundance of both fish larvae, suggesting a potential negative impact (via predation and competition) on the survival and recruitment of these 2 fisheries resources.

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Evaluating the role of endogenous and exogenous features on larval hake nutritional condition

Cited by 5 publications

References 49 publications

RNA/DNA and derived condition indices for anchovy and hake larvae as relevant information for comprehensive fisheries management

RNA/DNA and derived condition indices for anchovy and hake larvae as relevant information for comprehensive fisheries management

Intervention of re-feeding on growth performance, fatty acid composition and oxidative stress in the muscle of red swamp crayfish (Procambarus clarkii) subjected to short-term starvation

Contrasting distributional patterns of two co-occurring ctenophores in relation to ichthyoplankton and environmental features in the Southwestern Atlantic Ocean

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