2014 FISHING YEAR Atlantic Croaker Plan Review Team (original) (raw)
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Transactions of the American Fisheries Society, 1999
The accuracy of the Content should not be relied upon and should be independently verified with primary sources of information. Taylor and Francis shall not be liable for any losses, actions, claims, proceedings, demands, costs, expenses, damages, and other liabilities whatsoever or howsoever caused arising directly or indirectly in connection with, in relation to or arising out of the use of the Content. This article may be used for research, teaching, and private study purposes. Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden.
Projecting global climate change (GCC) effects on fish populations has primarily focused on temperature, while non-temperature effects are rarely simulated. In this study, we used a non-linear matrix population projection model of Atlantic croaker (Micropogonias undulatus) in the mid-Atlantic Bight to illustrate how global climate change effects, in addition to temperature, can be incorporated into population projections. The model was a multiple time step, stage-within-age matrix projection model with two nursery regions (Virginia and North Carolina estuaries) for young-of-the-year (YOY, egg to age-1) life stage development and a single ocean spatial box for adults. Late juvenile mortality was density-dependent and calibrated to generate a spawner-recruit relationship similar to observed values. Model simulations were for 160 years. Global climate change effects were estimated for 2020, 2050, and 2080, which resulted in three new sets of parameter values of the matrix model. The first 40 years of the 160 years were baseline, followed by 40 years of 2020 parameter values, 40 years of 2050 values, and 40 years of 2080 values. Changes in the parameters of the matrix model were based on changes in annual and seasonal temperatures generated by global circulation models, as well as presumed changes in precipitation causing increased hypoxia, increased variability in salinity, rising sea level, and changes in ocean circulation causing increased northward and offshore transport. Global climate change resulted in increased croaker abundance with lower inter-annual variability. Sensitivity analysis with each GCC effect imposed singly showed that the increase in croaker abundance under GCC was due to the complex suite of positive and negative responses across multiple life stages. The major positive response was due to warmer temperatures, and the major negative effects were due to increased variability in salinity, increased offshore transport, and sea level rise. A second sensitivity analysis showed that important, but highly uncertain, effects produced smoothly increasing population responses with increasing magnitude. We discuss how effects other than temperature can be important to projecting population responses to GCC, and the strengths and weaknesses of our analysis. Our analysis demonstrates how a variety of GCC-related effects can be incorporated into traditional population models; what is needed is sufficient empirical information to quantify the effects in terms of growth, mortality, movement, and reproduction.
Gulf of Mexico Science, 2018
Atlantic croaker (Micropogonias undulatus) are one of the more common finfishes in the Gulf of Mexico. They are a significant component of Gulf bait fisheries and an important midtrophic component of nearshore food webs. In this study, life-history parameters associated with growth, maturity, and seasonal migration were estimated for Atlantic croaker in Texas and integrated into previously described data throughout the rest of the species range. The major findings of this work were the following: (1) a majority (. 76%) of age-1 female Atlantic croaker were sexually mature; (2) egress of adults from inshore habitats took place in late fall (Oct./Nov.) in consecutive years (2002 and 2003); (3) egress of adults was predictably coincident with declining growth after age-1 and the onset of sexual maturity; and (4) ingress of juvenile Atlantic croaker into inshore nursery grounds began in early winter and progressed through early summer, but a majority of recruits appeared in a short span between Feb. and April. Seasonal patterns of migration of both adult and juvenile Atlantic croaker are consistent with those described in other parts of the species' range and imply offshore spawning in the fall and winter followed by year-round inshore development of postlarvae and juveniles. Given the importance of inshore residency of juvenile Atlantic croaker, abundance estimates from fishery-independent sampling were scaled up to system-wide estimates of juvenile abundance in two prominent Texas estuaries and used to qualitatively assess the potential impacts of the commercial fishery on the inshore segment of the population.
Development of a Methodology for Intensive Larviculture of Atlantic Croakers
North American Journal of Aquaculture, 2014
The accuracy of the Content should not be relied upon and should be independently verified with primary sources of information. Taylor and Francis shall not be liable for any losses, actions, claims, proceedings, demands, costs, expenses, damages, and other liabilities whatsoever or howsoever caused arising directly or indirectly in connection with, in relation to or arising out of the use of the Content. This article may be used for research, teaching, and private study purposes. Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden.
The Atlantic States Marine Fisheries Commission
Crab Wars
The Atlantic States Marine Fisheries Commission (Commission) would like to thank all state, federal, and academia representatives who contribute information for this document. Identification and prioritization of research needs is provided by members of various Commission committees, including species stock assessment subcommittees, technical committees, advisory committees, plan development and review teams, and management boards.
Transactions of the American Fisheries Society, 2001
Geographic variation in life history traits and population dynamics of Atlantic croakers Micropogonias undulatus found north of Cape Hatteras, North Carolina, suggests the possibility of two stocks along the U.S. Atlantic coast. The basis for this variation (i.e., genetic versus ecophenotypic) is unclear. Young-of-the-year Atlantic croakers were collected from three Atlantic coast estuaries (Delaware Bay, Delaware; Cape Fear River, North Carolina; and Indian River Lagoon, Florida) that represent the center and extreme distributional limits of the species' U.S. Atlantic coast range. Intrinsic growth capacity and cold tolerance were measured under common laboratory conditions to test for adaptive genetic variation in these traits. Results were used to evaluate the two stock hypothesis for the Atlantic croaker and to examine the integrity of Cape Hatteras as a possible genetic stock boundary. Growth capacity, feeding rate, growth efficiency, and cold tolerance were similar across geographic locations. Survival curves for Delaware and Florida Atlantic croakers were indistinguishable at each of four low temperatures tested (1, 3, 5, and 7ЊC), with neither group capable of surviving temperatures of 3ЊC or less. The suggested lack of adaptive variation we found in these physiological traits supports the hypothesis of a single genetic stock of Atlantic croakers along the Atlantic coast. Although severe winter temperatures may select for fast growth and cold-tolerant genotypes in northern estuaries, gene flow is apparently sufficient to preclude local genetic adaptation.
Population effects of shrimp trawl bycatch on Atlantic croaker
Canadian Journal of Fisheries and Aquatic Sciences, 2000
We used stage-within-age based matrix models of Atlantic croaker (Micropogonias undulatus) in the Gulf of Mexico and the South and Mid-Atlantic bights to explore the population-level impacts of shrimp trawl bycatch on estuarine-dependent fishes and to investigate tradeoffs between directed adult fisheries and bycatch mortality. The Gulf model reflected a rapidly declining population, while the Atlantic population showed a modest decline. Elasticity analyses indicated that both populations were more sensitive to the summed survival of adults than first-year survival, particularly in the Gulf. Contrary to our expectations, bycatch mortality on late juveniles was not the most important factor affecting either population of Atlantic croaker, and this result was robust to uncertainty in both adult and late juvenile mortality estimates. Both populations were most sensitive to ocean larva mortality, followed by mortality of estuary larvae and adults in the Gulf and of early juveniles and adults in the Atlantic. Nonetheless, bycatch mortality did have a large negative impact on population growth rates, and reducing late juvenile or adult mortality by about 35% in the Gulf or 5% in the Atlantic should reverse population declines. Bycatch reduction devices currently in use can achieve these desired reductions. Résumé : Nous avons utilisé des modèles matriciels des stades par tranche d'âge chez le grondeur atlantique (Micropogonias undulatus) dans le golfe du Mexique et dans les golfes sud-atlantique et médio-atlantique pour explorer les impacts au niveau de la population des prises accessoires du chalutage de la crevette sur les poissons dépendant des estuaires et pour examiner les compromis possibles entre la pêche dirigée des adultes et la mortalité dans les prises accessoires. Le modèle du golfe du Mexique a révélé une population en déclin rapide, tandis que celle de l'Atlantique ne connaissait qu'un déclin modéré. Les analyses d'élasticité ont indiqué que les deux populations étaient plus sensibles à la survie cumulée des adultes qu'à la survie de première année, particulièrement dans le golfe du Mexique. Contrairement à nos attentes, la mortalité exercée par les prises accessoires sur le dernier stade juvénile n'était pas le facteur le plus important affectant les diverses populations de grondeur atlantique, et ce résultat était robuste en présence d'incertitudes dans les estimations de la mortalité à la fois chez des adultes et au dernier stade juvénile. Les deux populations étaient avant tout sensibles à la mortalité des larves dans l'océan, puis à la mortalité des larves et des adultes en estuaire dans le golfe du Mexique, et des premiers stades juvéniles et des adultes dans l'Atlantique. Toutefois, la mortalité dans les prises accessoires avait un fort impact négatif sur le taux de croissance des populations, et une réduction de la mortalité du dernier stade juvénile ou des adultes, d'environ 35% dans le golfe du Mexique ou de 5% dans l'Atlantique, pourrait renverser la baisse des populations. Les dispositifs de réduction des prises accessoires actuellement utilisés doivent permettre d'obtenir les réductions souhaitées. [Traduit par la Rédaction] Diamond et al. 2021
Fishery Bulletin, 1997
The effect of different fishing mortality (Fl and natural mor tality (M), and age at first capture (tel on yield-per-recruit ofAtlantic croaker, Micropogoniasundulatus. in the lower Chesapeake Bay and North Carolina were evaluated with the Beverton-Holt model. Independent of the level of M (0.20-0.35) or F (0.01-2.0) used in simulations. yield-per-recruit values for Chesapeake Bay were consistently higher at t e = 1 and decreased continu ously with increases in t. (2-5). Al though maximum yield-per-recruit al ways occurred at the maximum level ofF(F=2.0), marginal increases in yield beyond F =0.50-0.75 were negligible. CurrentF (FCURl is estimated to be be low the level that produces maximum potential yield-per-recruit (FMAX) and at or below the level ofF0.1 if M ;<: 0.25. Although modeling results indicated yield-per-recruit could be maximized by reducing the current level of t. (t.=2l, the resultant gains were small and did not appear to justify such management measures. I...