Modeling long-term fluctuations in the distribution and abundance of Engraulis anchoita eggs and larvae in the southeastern Brazilian bight

Favero, Jana Menegassi del; Katsuragawa, Mario; Zani-Teixeira, Maria de Lourdes; Turner, Jefferson T.

doi:10.3354/meps12375

Cited by 4 publications

(5 citation statements)

References 59 publications

(25 reference statements)

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“…Decreasing trends in egg abundance, a proxy of E. anchoita biomass, are correlated with positive SST anomalies and high salinity conditions in the northern Argentine shelf (Auad and Martos 2012). Off southern Brazil, egg and larval abundance of anchovy are also negatively correlated with temperature fluctuations (del Favero et al 2018). A long-term analysis (1991-2017) also revealed a declining trend in Argentine anchovy landings (34°-41°S), together with a decrease in the size and weight at age (Prenski et al 2016 and references therein).…”

Section: Fisheriesmentioning

confidence: 93%

Climate change impacts on the atmospheric circulation, ocean, and fisheries in the southwest South Atlantic Ocean: a review

et al. 2020

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We present an interdisciplinary review of the observed and projected variations in atmospheric and oceanic circulation within the southwestern South Atlantic focused on basin-scale processes driven by climate change, and their potential impact on the regional fisheries. The observed patterns of atmospheric circulation anomalies are consistent with anthropogenic climate change. There is strong scientific evidence suggesting that the Brazil Current is intensifying and shifting southwards during the past decades in response to changes in near-surface wind patterns, leading to intense ocean warming along the path of the Brazil Current, the South Brazil Bight, and in the Río de la Plata. These changes are presumably responsible for the poleward shift of commercially important pelagic species in the region and the long-term shift from cold-water to warm-water species in industrial fisheries of Uruguay. Scientific and traditional knowledge shows that climate change is also affecting small-scale fisheries. Long-term records suggest that mass mortalities decimated harvested clam populations along coastal ecosystems of the region, leading to prolonged shellfishery closures. More frequent and intense harmful algal blooms together with unfavorable environmental conditions driven by climate change stressors affect coastal shellfisheries, impact economic revenues, and damage the livelihood of local communities. We identify future modelling needs to reduce uncertainty in the expected effects of climate change on marine fisheries. However, the paucity of fisheries data prevents a more effective assessment of the impact of climate change on fisheries and hampers the ability of governments and communities to adapt to these changes.

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Section: Fisheriesmentioning

confidence: 93%

Climate change impacts on the atmospheric circulation, ocean, and fisheries in the southwest South Atlantic Ocean: a review

et al. 2020

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“…Zero‐inflated negative binomial modeling of Argentine Anchovy Engraulis anchoita eggs was conducted to address issues of false‐zero counts and true‐zero counts (Favero et al. ); however, a gap persists wherein a single egg collection event in space (without replication and without accounting for detection probability) may result in an underestimation of egg abundance (Favero et al. ).…”

Section: Discussionmentioning

confidence: 99%

“…); however, a gap persists wherein a single egg collection event in space (without replication and without accounting for detection probability) may result in an underestimation of egg abundance (Favero et al. ).…”

Section: Discussionmentioning

confidence: 99%

“…To our knowledge, there are no examples of inland, marine, or anadromous fish egg abundance being modeled under the N-mixture framework. Zero-inflated negative binomial modeling of Argentine Anchovy Engraulis anchoita eggs was conducted to address issues of false-zero counts and true-zero counts (Favero et al 2018); however, a gap persists wherein a single egg collection event in space (without replication and without accounting for detection probability) may result in an underestimation of egg abundance (Favero et al 2018). As a global model for explaining river herring egg abundance in both tributaries, the N-mixture hierarchical model following the negative binomial distribution performed best in our particular study scenario.…”

Section: Discussionmentioning

confidence: 99%

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N‐Mixture Modeling of River Herring Egg Abundance and Distribution in the Tributaries of the Hudson River

Kowalik

Eakin

2019

Mar Coast Fish

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N‐mixture models are often employed to estimate latent organismal abundance while concurrently accounting for detection probability. Our study offers a novel means for simultaneously measuring abundance, detection probability, and gear efficiency by focusing on a previously understudied and relatively immobile subject (river herring eggs). Custom‐designed egg mats accommodating two individual collecting surfaces were deployed in two tributaries of the Hudson River (Fall Kill and Black Creek, New York) to collect anadromous river herring eggs during the spawn. Mats were orientated approximately parallel to streamflow under a stratified random sampling design. Strata were defined as three equidistant spatial segments measured from a given tributary's confluence with the main stem of the Hudson River to its first impassable barrier to fish migration. In total, 93 sites were surveyed, with the majority of eggs being detected within the upper two‐thirds of each respective tributary. Throughout the course of the sampling season, an average of 1,585 eggs per egg mat subsampling event was recovered from the upper two strata of Black Creek, and 2,619 eggs per subsampling event were recovered from the upper two strata of the Fall Kill. In Black Creek, an egg density of 568 eggs per 58.1‐cm2 egg mat subsample was observed over an average deployment duration of 3.7 d at a detection rate of 82%. In the Fall Kill, an egg density of 1,222 eggs per 58.1‐cm2 subsample was observed over an average deployment duration of 3.9 d at a detection rate of 92%. The N‐mixture negative binomial model outperformed Poisson and zero‐inflated Poisson N‐mixture models in estimating river herring egg abundance using Akaike's information criterion model comparison indices. In terms of iteration processing time, N‐mixture modeling using the “unmarked” package in R proved to be more efficient than Bayesian‐based hierarchical modeling processed through the “jagsUI” package.

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“…Various monitoring programs have constituted long‐term data sets of egg and larval information (Favero et al. 2018, McClatchie 2014, McClatchie et al. 2014, Smith et al.…”

Section: Introductionmentioning

confidence: 99%

Effects of formalin preservation on egg size of small pelagic fish as major target species in ichthyoplankton surveys

Nyuji

Yoneda²,

Nakamura³

et al. 2022

Aquaculture Fish & Fisheries

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Preservation is critical for egg and larval samples from ichthyoplankton surveys. As growing interest is directed toward maternal effects on egg quality, historical collections of egg samples in formalin are potentially invaluable materials but concerns about the effects of formalin preservation need to be clarified. The present study examined effects of formalin preservation on egg size of Japanese sardine Sardinops melanostictus, chub mackerel Scomber japonicus and Japanese anchovy Engraulis japonicus over a long period (30–36 months). Overall, the egg sizes slightly decreased in a couple of months after preservation but then recovered to be at a similar level to the live eggs for diameters of spherical eggs of sardine and mackerel and short diameters of ellipsoidal eggs of anchovy, although a caveat lies in unstable and slightly increasing patterns in long diameters of anchovy eggs. No substantial differences were found between 5% and 10% formalin solutions. For practical purposes, we conclude that no correction factors are required for using the measurements of egg samples preserved in formalin over a long period. Assuming the applicability to congeneric species, the information presented here supports the validity of previous studies and will promote future studies on egg size variability in small pelagic fish based on historical collections of egg samples preserved in formalin in various regions of the world.

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Modeling long-term fluctuations in the distribution and abundance of Engraulis anchoita eggs and larvae in the southeastern Brazilian bight

Cited by 4 publications

References 59 publications

Climate change impacts on the atmospheric circulation, ocean, and fisheries in the southwest South Atlantic Ocean: a review

Climate change impacts on the atmospheric circulation, ocean, and fisheries in the southwest South Atlantic Ocean: a review

N‐Mixture Modeling of River Herring Egg Abundance and Distribution in the Tributaries of the Hudson River

Effects of formalin preservation on egg size of small pelagic fish as major target species in ichthyoplankton surveys

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