Nutritional condition and otolith growth of Engraulis anchoita larvae: The comparison of two life traits indexes

Souto, Marina Do; Brown, Daniel R.; Leonarduzzi, Ezequiel; Capitanio, Fabiana L.; Diaz, Marina V.

doi:10.1016/j.jmarsys.2019.01.008

Cited by 9 publications

(6 citation statements)

References 45 publications

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“…This pattern has also been documented for Engraulis anchoita , a small pelagic clupeid that resides north of S . fuegensis ’ distribution in the Argentine shelf (Do Souto et al, 2019), and for Sprattus sprattus in the North and Baltic Seas (Kanstinger & Peck, 2009; Voss et al, 2006). Such ontogenetic variability could be a consequence of the allometric relationship between SL and sprat mouth gape.…”

Section: Discussionmentioning

confidence: 99%

“…fuegensis larvae (0.44–8.53) were similar to those obtained for E . anchoita by Diaz et al (2011) and Do Souto et al (2019), which employed the same methodological approach used in this study. Preflexion larvae of both clupeid species were more vulnerable and in poorer condition than further developed larvae.…”

Section: Discussionmentioning

confidence: 99%

“…Examination of life traits reveals important information about early development. Nucleic acid‐based indices have been widely used as proxies of growth and physiological status (Bulow, 1970; Ferron & Leggett, 1994), with RNA/DNA ratios frequently studied in clupeids species (e.g., Do Souto et al, 2019; Kanstinger & Peck, 2009; Voss et al, 2006). This biochemical index measures cell synthetic capacity, which strongly correlates with nutritional status in individuals.…”

Section: Introductionmentioning

confidence: 99%

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Ontogeny versus environmental forcing off the Southwest Atlantic Ocean: Nutritional condition of Fuegian sprat (Sprattus fuegensis) early stages

Alonso

Diaz

Pájaro

et al. 2021

Fisheries Oceanography

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The Fuegian sprat, Sprattus fuegensis, plays a key trophic role in the Southwest Atlantic Ocean. Growth and survival of small pelagic fishes like sprat are strongly affected by environmental variability and can determine recruitment success. We estimated the nucleic acid composition and assessed with a standardized RNA/DNA index (sRD) the nutritional condition of 273 larvae, metamorphosing, and juvenile Fuegian sprat from two environmentally distinct habitats: the waters off Tierra del Fuego (TDF) and the Marine Protected Area Namuncurá/Burdwood Bank (MPAN/BB). A similar ontogenetic pattern, in which nucleic acid concentrations decreased and sRD increased with increasing standard length (SL) among larval stages was observed in both habitats. A higher percentage of preflexion larvae were under the sRD threshold for growth and optimal growth performance, with sRD values being significantly higher in TDF. Postflexion larvae in both habitats showed maximum sRD values, suggesting that both habitats are suitable nursery grounds. In contrast, metamorphosing and juvenile sprat (only captured in TDF) had consistently low nucleic acid concentrations and sRD values despite increasing SL. Environmental forcing (temperature, salinity, and station depth) was assessed over size‐corrected larval sRD. The best model included a negative response to station depth, and the effect of processes associated with this factor are discussed. Although further analyses are needed to reveal underlying dynamics determining early development, these results comprise a baseline for future monitoring approaches on Fuegian sprat life traits and factors affecting their recruitment in this region.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ontogeny versus environmental forcing off the Southwest Atlantic Ocean: Nutritional condition of Fuegian sprat (Sprattus fuegensis) early stages

Alonso

Diaz

Pájaro

et al. 2021

Fisheries Oceanography

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“…Digital image processing software (Kontron program) was used for measuring daily increment widths according to Brown and Sánchez (). A recent growth rate value (RGR) was calculated as the mean width of the last three completely formed increments, and it was considered as a value of larval recent growth (Do Souto et al, ; Leonarduzzi, Brown, & Sánchez, ; Somarakis & Nikolioudakis, ). In addition, an average daily growth by age value (DG) was calculated for the individuals sampled in the same transect.…”

Section: Methodsmentioning

confidence: 99%

“…While the analysis of otolith microstructure, nutritional condition, and mortality are widely used to qualify larvae status, there are few studies that compare several of these methodologies together (Do Souto, Brown, Leonarduzzi, Capitanio, & Diaz, 2019;García, Cortés, & Ramirez, 1998;Grote et al, 2012;Peck et al, 2015). In this work, we performed an integrative study of E. anchoita larvae life traits to better understand the driving factors for the survival of early developmental stages.…”

mentioning

confidence: 99%

Putting the pieces together: Recent growth, nutritional condition, and mortality of Engraulis anchoita larvae in the Southwest Atlantic

Souto

Brown

Segura

et al. 2019

Fisheries Oceanography

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Dynamics of clupeiform fish populations such as anchovy are frequently impacted by environmental variations which can affect the success of the species recruitment. Herein, we have analyzed recent otolith growth rate, RNA/DNA nutritional condition index (sRD), and mortality rate of argentine anchovy larvae Engraulis anchoita from three different nursery areas in the Southwest Atlantic. We have evaluated the relationship between the environmental variables (abundance of copepod nauplii, temperature, chlorophyll‐a concentration, and abundance of E. anchoita larvae) and larval endogenous variables (size, weight, age, and otolith radius) to sRD and recent growth rate. Fast larval growth rates were observed toward the northern sector of the studied area, characterized by higher temperature. High values of sRD were associated with higher nauplii abundance in the proximity of coastal fronts. The larvae with the lowest growths and lowest minimum values of nutritional condition coincided with the area where there was less abundance of nauplii and higher larval mortality. Larval size and nauplii abundance were positive explanatory factors for both recent growth rate and sRD index. Temperature had a positive effect on recent growth rate and a negative effect on sRD index. This condition index was poorly explained in terms of model fit in comparison with the growth model. The results herein provided could be significant to better understand the recruitment of the species, as to determining favorable areas for the growth and survival of anchovy larvae.

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Artificial light at night (ALAN) causes variable dose-responses in a sandy beach isopod

Quintanilla-Ahumada

Quijón

Manríquez

et al. 2022

Environ Sci Pollut Res

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Nutritional condition and otolith growth of Engraulis anchoita larvae: The comparison of two life traits indexes

Cited by 9 publications

References 45 publications

Ontogeny versus environmental forcing off the Southwest Atlantic Ocean: Nutritional condition of Fuegian sprat (Sprattus fuegensis) early stages

Ontogeny versus environmental forcing off the Southwest Atlantic Ocean: Nutritional condition of Fuegian sprat (Sprattus fuegensis) early stages

Putting the pieces together: Recent growth, nutritional condition, and mortality of Engraulis anchoita larvae in the Southwest Atlantic

Artificial light at night (ALAN) causes variable dose-responses in a sandy beach isopod

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