scholarly journals Impacts of mycobacteriosis on the growth of striped bass (Morone saxatilis) in Chesapeake Bay

2012 ◽  
Vol 69 (2) ◽  
pp. 247-258 ◽  
Author(s):  
Robert J. Latour ◽  
David T. Gauthier ◽  
James Gartland ◽  
Christopher F. Bonzek ◽  
Kathleen A. McNamee ◽  
...  
Keyword(s):  
Chesapeake Bay ◽  
Striped Bass ◽  
Atlantic Coast ◽  
Morone Saxatilis ◽  
Population Level ◽  
Disease Status ◽  
Growth Patterns ◽  
Growth Data ◽  
High Prevalence ◽  
The Us

The striped bass (Morone saxatilis) is an economically and ecologically valuable finfish species that inhabits nearshore and estuarine waters of many states along the US Atlantic coast. Chesapeake Bay provides extensive nursery and foraging habitats for striped bass, yet fish in the bay exhibit high prevalence of disease caused by bacteria in the genus Mycobacterium. Detection of population-level impacts associated with mycobacteriosis has been difficult because the disease is chronic and synoptic biological and disease data have been limited. Here, we present modeling analyses of growth data for disease-positive and -negative striped bass in Chesapeake Bay. Three growth relationships were considered, and for each, a single model was parameterized to include several covariates, most notably disease status and severity. Our results indicate that disease-positive and -negative fish have differing growth patterns and that the estimated asymptotic sizes of disease-positive fish are considerably lower than those of disease-negative fish. Compromised growth along with documentation that striped bass in Chesapeake Bay are experiencing disease-associated mortality suggests that disease may be reducing the productivity of this species.

Effects of predation on telemetry-based survival estimates: insights from a study on endangered Atlantic salmon smolts

2015 ◽  
Vol 72 (5) ◽  
pp. 728-741 ◽  
Author(s):  
A. Jamie F. Gibson ◽  
Edmund A. Halfyard ◽  
Rod G. Bradford ◽  
Michael J.W. Stokesbury ◽  
Anna M. Redden
Keyword(s):  
Atlantic Salmon ◽  
Striped Bass ◽  
Survival Rates ◽  
Morone Saxatilis ◽  
Population Level ◽  
Fish Predation ◽  
Bay Of Fundy ◽  
Migration Patterns ◽  
Predation Effects

Telemetry is increasingly being used to estimate population-level survival rates. However, these estimates may be affected by the detectability of telemetry tags and are reliant on the assumption that telemetry data represent the movements of the tagged fish. Predation on tagged fish has the potential to bias survival estimates, and unlike the issue of detectability, methods to correct for the resulting bias (termed “predation bias”) are not yet developed. In an acoustic telemetry study on inner Bay of Fundy Atlantic salmon (Salmo salar) smolts during 2008 and 2011, unusual tag detection patterns were indicative that some data may have been representative of the movements of predators rather than smolts. To incorporate predation effects into the resulting survival estimates, a suite of 11 summary migration metrics were compared between Atlantic salmon smolts and striped bass (Morone saxatilis). Cluster analyses revealed that 2.4% to 13.6% of tags implanted in smolts exhibited migration patterns more similar to striped bass than to other smolts, which was interpreted here as evidence of predation. Reassigning the fate of these tags as “depredated–died” reduced estimated survival from 43.5% to 41.1% in 2008 and from 32.6% to 19.0% in 2011 relative to a traditional mark–recapture model, illustrating the effect of predation bias in this case study.

scholarly journals Low prevalence of splenic mycobacteriosis in migratory striped bass Morone saxatilis from North Carolina and Chesapeake Bay, USA

2010 ◽  
Vol 90 (3) ◽  
pp. 181-189
Author(s):  
MA Matsche ◽  
A Overton ◽  
J Jacobs ◽  
MR Rhodes ◽  
KM Rosemary
Keyword(s):  
North Carolina ◽  
Chesapeake Bay ◽  
Striped Bass ◽  
Morone Saxatilis ◽  
Low Prevalence

Studies on Ergasilus labracis Krøyer (Cyclopidea: Ergasilidae) parasitic on striped bass, Morone saxatilis, from the lower Chesapeake Bay. I. Distribution, life cycle, and seasonal abundance

1976 ◽  
Vol 54 (4) ◽  
pp. 449-462 ◽  
Author(s):  
I. Paperna ◽  
D. E. Zwerner
Keyword(s):  
Life Cycle ◽  
Chesapeake Bay ◽  
Striped Bass ◽  
Egg Production ◽  
Developmental Stages ◽  
Morone Saxatilis ◽  
Early Spring ◽  
Seasonal Abundance ◽  
Free Living ◽  
Winter Peak

Information on the distribution, life cycle, and seasonal abundance of the copepod Ergasilus labracis Krøyer, parasitic on the gills of lower Chesapeake Bay striped bass, Morone saxatilis (Walbaum), is presented after a 12-month survey. The overall prevalence of E. labracis was 90% in all localities sampled and it was found to be as euryhaline as its host; it has been found in salinities from 0.l‰ to 32.0‰. E. labracis was present and reproductively active throughout the year, suffering only a temporary slowdown in egg production at the beginning of the winter. Peak invasion of striped bass gills by infective larvae occurred during April and May; minor peaks were also recorded during July and October. The free-living stage was estimated to last as long as 6 weeks during early spring. Duration of other developmental stages was also extrapolated. Attempts to rear larvae in the laboratory past the metanauplius stage failed. Larvae could be kept for a maximum of 23 days after hatching if fed nannoplankton and kept at 20 °C in river water of 16–18‰.

Density-dependent regulation of year-class strength in age-0 juvenile striped bass (Morone saxatilis)

2012 ◽  
Vol 69 (3) ◽  
pp. 430-446 ◽  
Author(s):  
E.J. Martino ◽  
E.D. Houde
Keyword(s):  
Chesapeake Bay ◽  
Striped Bass ◽  
Morone Saxatilis ◽  
Winter Temperature ◽  
Density Dependent ◽  
Early Juvenile Stage ◽  
Class Strength ◽  
Dependent Growth ◽  
Overwinter Mortality ◽  
Density Dependent Regulation

Abundance of age-0 striped bass ( Morone saxatilis ) exhibits 50-fold variability in Chesapeake Bay. Processes that act to reduce and thus regulate this variability were investigated. The potential for density-dependent regulation of growth and mortality in the early juvenile stage and its causes were investigated. Data from multiple seine and trawl surveys in upper Chesapeake Bay and tributaries were analyzed to construct growth and mortality indices having a high degree of spatial and temporal resolution. Age-0 mean lengths in September were inversely related to density, ranging from 67.8 mm in 1994, when mean density was 0.036·m–2, to 104.5 mm in 1992, when mean density was 0.003·m–2. Except for the Potomac River, evidence for density-dependent growth was consistent across subpopulations. Bioenergetics modeling indicated that prey consumption was limiting except in low-abundance years. Mortality increased with respect to abundance and also was density-dependent. The significant interaction between age-0 juvenile length in September and subsequent winter temperature on mortality indicated that density-dependent growth leads to size-selective overwinter mortality. A statistical model including age-0 abundances, age-0 lengths, and winter temperature explained a substantial fraction of variability and the mechanisms for regulation of striped bass recruitment.

Concordant estimates of countergradient growth variation in striped bass (Morone saxatilis) using comparative life-history data

2012 ◽  
Vol 69 (8) ◽  
pp. 1261-1265 ◽  
Author(s):  
Andrew L. Rypel
Keyword(s):  
Life History ◽  
Striped Bass ◽  
Genetic Basis ◽  
Morone Saxatilis ◽  
Common Garden ◽  
Growth Patterns ◽  
History Data ◽  
Life History Data ◽  
Common Garden Experiments ◽  
Size At Age

Latitudinal growth compensation (i.e., countergradient growth) is increasingly suspected to be pervasive across diverse taxa. However, a major challenge limiting wider exploration of this topic lies in the difficulty of quantifying these relationships. Common garden experiments, and ideally genetics, remain the only true methods for understanding the genetic basis for compensatory growth. However, previous research suggests that comparative life-history data might produce concomitant, albeit nonconfirmatory, results on countergradient growth variations. However, there have been no evaluations of the precision of such estimates against those that are experimentally derived. I examined countergradient growth variations using comparative size-at-age data for striped bass ( Morone saxatilis ), a species for which experiments have already quantified countergradient growth patterns, and compared results derived from both techniques. The slope of the growth–latitude relationship for striped bass in eastern North America as measured with comparative data was virtually identical to that produced from experiments. Furthermore, comparative estimates of countergradient growth variations developed using a variety of metrics produced highly concordant results with one another. Comparative life-history data are not a replacement for experiments, but do provide valuable information on countergradient growth variations, especially for species and hypotheses not amenable to experimentation.

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