Mixed-stock analysis of striped bass in two rivers of the Bay of Fundy as revealed by mitochondrial DMA

1995 ◽  
Vol 52 (5) ◽  
pp. 961-970 ◽  
Author(s):  
Isaac Wirgin ◽  
Mark Pedersen ◽  
Steven Maceda ◽  
Brian Jessop ◽  
Simon Courtenay ◽  
...  
Keyword(s):  
Chesapeake Bay ◽  
Striped Bass ◽  
Hudson River ◽  
Bay Of Fundy ◽  
Frequency Data ◽  
River Population ◽  
Saint John ◽  
Spawning Stock ◽  
Mitochondrial Dna Genotype ◽  
Mixed Stock

Mark–recapture studies have shown that striped bass from the Hudson River and Chesapeake Bay migrate to the Bay of Fundy and its tributaries during spring and summer. The objective of this study was to determine the relative contributions of U.S. stocks and the endemic Shubenacadie River population to the adult striped bass aggregations that occurred during 1992 and 1993 in two rivers of the Bay of Fundy: the Saint John River, New Brunswick (where striped bass spawning may not presently occur), and the Shubenacadie River, Nova Scotia (where striped bass spawning occurs). Mitochondrial DNA genotype frequency data were used in a mixture model. Up to 97% of adults from the Saint John River were determined to be of U.S. origin, whereas less than 10% of adult striped bass collected in the Shubenacadie River were migrants from U.S. stocks. Consequently, we suggest that efforts to maintain or restore the Saint John River population with native broodstock may be unsuccessful owing to possible extinction of the native stock; however, protection of the Shubenacadie River spawning stock should be enhanced.

Catch and Release in Marine Recreational Fisheries

2002 ◽  
Keyword(s):  
Striped Bass ◽  
Growth Parameters ◽  
Size Composition ◽  
Hudson River ◽  
Sensitivity Analyses ◽  
Selective Mortality ◽  
River Population ◽  
Spawning Stock ◽  
The Mean ◽  
Size Limits

<em> Abstract.</em>—One component of the management regimen employed to rebuild the Atlantic coastal migratory stock of striped bass <em> Morone saxatilis </em>was the imposition of large size limits to reduce fishing mortality to zero, on the 1982 and subsequent year-classes, until 95% of the females had an opportunity to reproduce at least once. Such size limits introduce size-selective mortality that favors the survival of slower-growing members of the population and may select for slower growth in succeeding generations. Size-at-age data from the Hudson River population were used to examine the effect of alternative size limits on the length distributions of survivors by age using simulation. The results indicate that minimum sizes currently in use can cause profound changes in the size composition of the spawning stock. The mean asymptotic length of unfertilized eggs under equilibrium conditions was estimated as an index of the extent to which these changes may influence future growth. With the current best estimates of growth parameters and fecundity at size, this index was reduced by only about 3%. However, because of the size-selective mortality in the existing fishery and uncertainty arising from sampling difficulties, growth is probably poorly characterized by the existing data. Sensitivity analyses revealed that some reasonable combinations of growth and minimum sizes can induce changes in the mean asymptotic length of unfertilized eggs by more than 10%, which would be about 30% in terms of asymptotic mean weight. The extent to which this selective force might be expressed in succeeding generations is uncertain. However, reliance on minimum sizes to constrain catch has the potential to cause profound changes in growth and probably should not be adopted for long-term management of striped bass until this problem is better understood.

Mixed-stock analysis of Atlantic coast striped bass (Morone saxatilis) using nuclear DNA and mitochondrial DNA markers

1997 ◽  
Vol 54 (12) ◽  
pp. 2814-2826 ◽  
Author(s):  
Isaac I Wirgin ◽  
John R Waldman ◽  
Lorraine Maceda ◽  
Joseph Stabile ◽  
Victor J Vecchio
Keyword(s):  
Mitochondrial Dna ◽  
Chesapeake Bay ◽  
Striped Bass ◽  
Nuclear Dna ◽  
Morone Saxatilis ◽  
Hudson River ◽  
Mixed Stock Analysis ◽  
Stock Analysis ◽  
Length Variant ◽  
Mixed Stock

Striped bass (Morone saxatilis) stocks comingle along the northeastern United States and Canadian coasts and support mixed-stock fisheries in which stock compositions fluctuate widely. Many approaches to stock analysis of these populations have been tried. The recent use of mitochondrial DNA (mtDNA) haplotype frequency data showed promising results, despite low levels of mtDNA variation; to improve resolution, we used a single-copy nuclear DNA (nDNA) probe with two mtDNA markers (major length variants and Taq I variants), alone or in combination. Striped bass reference collections were from the Hudson River and Chesapeake Bay, and mixed-stock collections (1989 and 1991) were from eastern Long Island, New York. The combination of the nDNA and mtDNA major length variant data provided lower but still quite high resolution potential (Dst = 0.417) in mixed-stock analysis (1991 collection) than the combination of all three markers (Dst = 0.552). However, unlike the Hudson River stock, the Chesapeake Bay stock is composed of multiple substocks that vary significantly in the frequencies of Taq I variants; this among-substock variation destabilizes the Chesapeake Bay reference data set and the resultant mixed-stock estimates. Thus, we recommend an approach based on composite nDNA and mtDNA major length variant markers.

From Catastrophe to Recovery: Stories of Fishery Management Success

2019 ◽  
Keyword(s):  
Striped Bass ◽  
Fishery Management ◽  
Hudson River ◽  
Management Plan ◽  
Lessons Learned ◽  
Juvenile Abundance ◽  
Spawning Stock ◽  
Long Term Monitoring ◽  
Term Monitoring

<i>Abstract</i>.—The Striped Bass <i>Morone saxatilis</i> is an extremely important commercial and recreational species with a coastal migratory stock in the United States referred to as “Atlantic Striped Bass” managed by the Atlantic States Marine Fisheries Commission (ASMFC). Atlantic Striped Bass has four major contributing stocks, including the Chesapeake Bay, which comprises 70–90%, and the Hudson River, the Delaware River, and the Albemarle Sound/Roanoke River (A/R). The collapse of Atlantic Striped Bass in the late 1970s precipitated federal funding and legislation like the Emergency Striped Bass Study for research on causative factors of the decline and potential management recommendations. The 1981 ASMFC Interstate Fishery Management Plan (ISFMP) for Atlantic Striped Bass was nonmandatory and mostly ineffective until the 1984 Atlantic Striped Bass Conservation Act provided regulatory authorities to the ASMFC and the federal government to close fisheries in states out of compliance with ISFMPs. Restrictions and moratoria on harvest imposed in several states reduced mortality, and under favorable environmental conditions and given Striped Bass life history, multiple years of good recruitment occurred. This allowed target thresholds for female spawning stock biomass to be achieved and the ASMFC to declare recoveries of Atlantic Striped Bass stocks from 1995 to 1998. Regulation of river flows was particularly important for the A/R stock recovery, and this stock is presented as a case study. During the 20+ years following recovery, long-term monitoring by states in support of adaptive management was primarily supported by the stable, nonappropriated funding of the Sport Fish Restoration Act. Monitoring includes spawning stock characterization and biomass estimation, juvenile abundance surveys, cooperative coastwide tagging, and harvest data collection. Future issues facing the recovered Atlantic Striped Bass include interspecies effects of relatively high abundance, management of stocks separately instead of as a single coastal stock, and ecosystem-based fisheries management. Key lessons learned in the Atlantic Striped Bass recovery are that high societal value of the species provided the political impetus to create and fund the recovery program, coordination of management and enforcement efforts among all jurisdictions was essential for this migratory species, and fully funded long-term monitoring programs are critical to adaptive population management.

Mitochondrial DNA Variation in Striped Bass (Morone saxatilis) from Canadian Rivers

1993 ◽  
Vol 50 (1) ◽  
pp. 80-87 ◽  
Author(s):  
Isaac I. Wirgin ◽  
Tun-Liang Ong ◽  
Lorraine Maceda ◽  
John R. Waldman ◽  
David Moore ◽  
...  
Keyword(s):  
Mitochondrial Dna ◽  
Striped Bass ◽  
Genetic Relatedness ◽  
Morone Saxatilis ◽  
Hudson River ◽  
Gene Pools ◽  
Dna Variation ◽  
Genotype Frequencies ◽  
Mitochondrial Dna Genotype ◽  
The Impact

Mitochondrial DNA(mtDNA)was analysed to determine the genetic relatedness of striped bass (Morone saxatilis) populations in tributaries to the Gulf of St. Lawrence and the Bay of Funday. Mitochondrial DNA genotype frequencies were compared with those of striped bass from the Shubenacadie River (Bay of Fundy) and the Miramichi and Tabusintac rivers (Gulf of St. Lawrence). These mtDNA genotype frequencies were compared with those of striped bass representative of the Atlantic coastal migratory stock originating in the Hudson River and Chesapeake Bay. Differences in the frequencies of mtDNA length variants permitted discrimination of the Shubenacadie River from the Miramichi River and Tabusintac River populations and all three Canadian populations from the U S. spawned costal migratory stock. No difference in the frequency of mtDNA length variants was observed between Tabusintac River and Miramichi River striped bass. Heteroplasmy for mtDNA length variants was observed in 35% of Gulf of St. Lawrence fish, the highest frequency observed in any striped bass population. These results highlight the genetic heterogeneity of these Canadian striped bass populations and their distinctiveness from U S. stocks. Future efforts to restore these depleted Canadian striped bass populations should consider the impact of stock transfer on endemic striped bass gene pools.

Hudson River Fishes and their Environment

2006 ◽  
Keyword(s):  
Time Series ◽  
Chesapeake Bay ◽  
Striped Bass ◽  
Early Stage ◽  
Cohort Analysis ◽  
Local Population ◽  
Monitoring Program ◽  
Hudson River ◽  
Juvenile Abundance ◽  
Bay Anchovy

<em>Abstract.</em>—We review three areas of recent research on Hudson River bay anchovy <em>Anchoa mitchilli</em>. One focus has been the along-estuary movement of early life stages. A cohort analysis of samples collected in a spatiotemporally extensive monitoring program confirmed that early-stage anchovy migrate upestuary at an estimated rate of 0.6 km/d. Complementary fine-scale field sampling found that early-stage anchovy can show preferences for depth and can conduct periodic vertical migration. To determine whether these behaviors were sufficient to produce up-estuary migration, larval flux and velocity were estimated. These estimates were consistent with local retention rather than concerted migration. High priority should be given to examining individual migration histories through analysis of otolith microchemistry. A second focus of research on Hudson anchovy has been on local population structure, permitting comparison to anchovy in other locations. Anchovy that spawn in the Hudson River are larger than those spawning in the Chesapeake Bay region and are mostly 2 years old, whereas yearlings predominate in other estuaries. Batch fecundity was lower and egg mortality higher in the Hudson River than in Chesapeake Bay. A key issue arising from these recent findings is the degree to which the Hudson anchovy pool is connected with other large anchovy pools, such as Narragansett Bay and Chesapeake Bay. A third focus of research on Hudson anchovy has been interannual variability in early-stage abundance. A more than 20-year time series of juvenile bay anchovy abundance shows that juvenile abundance has varied over one order of magnitude. There has been no significant change in abundance over the entire time series, but abundance has declined 10-fold since a peak in the late 1980s. Anchovy abundance was negatively associated with the abundance of early-stage striped bass <em>Morone saxatilis </em>and positively associated with the abundance of early-stage Atlantic tomcod <em>Microgadus tomcod</em>. We suggest that these associations reflect direct interactions among the species and urge further work on the ecological role of striped bass in the estuary.

Dose-Related Toxicity of Copper and Cadmium in Striped Bass Larvae from the Chesapeake Bay: Field Considerations

1988 ◽  
Vol 20 (6-7) ◽  
pp. 39-48 ◽  
Author(s):  
David A. Wright
Keyword(s):  
Chesapeake Bay ◽  
Striped Bass ◽  
Toxic Metal ◽  
Published Data ◽  
Metal Concentrations ◽  
Frequency Distributions ◽  
Order Of Magnitude ◽  
Toxic Concentrations ◽  
And Control ◽  
Spawning Tributaries

Copper and cadmium monitoring in Chesapeake Bay sediments indicates that metal contamination exists in nursery areas for striped bass (Moronesaxatilis), which has been in serious decline over the last 17 years. Whole water metal concentrations in one spawning river were within an order of magnitude of published acutely toxic concentrations. Larval striped bass were exposed in the laboratory to copper and cadmium concentrations which were acutely toxic over a 96h period (24 and 19 µg L−1, respectively), and to sub-lethal concentrations of these metals over a three week period. Larvae from acutely toxic metal treatments, sub-lethal metal concentrations and control tanks were analyzed for cadmium and copper and the frequency distribution of metal body burdens was compared with field data. The distribution of copper concentrations in laboratory-exposed larvae was completely within the range of field specimens, and there was considerable overlap in cadmium frequency distributions from laboratory and field larvae. These results together with other published data suggest that environmental metal concentrations in some spawning tributaries of the Chesapeake Bay may pose a threat to striped bass, and the suggestion is made that greater efforts should be made to link laboratory and field toxicological data.

Dispersal of Young-of-the-Year Hatchery Striped Bass in the Hudson River

1991 ◽  
Vol 11 (3) ◽  
pp. 381-392 ◽  
Author(s):  
Alan W. Wells ◽  
Donna M. Randall ◽  
Dennis J. Dunning ◽  
John R. Young
Keyword(s):  
Striped Bass ◽  
Hudson River ◽  
Young Of The Year
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