Population Changes and Location-Specific Differences for Otolith-Derived Age and Growth of Recreationally Harvested Spotted Seatrout (Cynoscion nebulosus) From Alabama in 2007

Johnson, Matthew W.; Bortone, Stephen A.; Klement, Bradley W.; Shipp, Robert L.

doi:10.18785/goms.2901.02

Cited by 5 publications

(10 citation statements)

References 24 publications

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“…For example, Johnson et al. () used fishery‐dependent data to estimate an

L_{\infty}

of 65.9 cm for Spotted Seatrout in Alabama, which is substantially larger than any

L_{\infty}

value estimated in our study. Additionally, Dippold et al.…”

Section: Discussioncontrasting

confidence: 73%

“…Parameter estimates for the length-at-age relationship of Spotted Seatrout in Mississippi and Alabama echo our findings of heterogeneity in growth among estuaries. For example, Johnson et al (2011) used fishery-dependent data to estimate an L 1 of 65.9 cm for Spotted Seatrout in Alabama, which is substantially larger than any L 1 value estimated in our study. Additionally, Dippold et al (2016) used tag-recapture methods and otolith-derived age data to estimate growth curves for Spotted Seatrout in Mississippi by using a three-parameter logistic model.…”

Section: Estuary Codecontrasting

confidence: 68%

“…The discrepancy between our estimates of

L_{\infty}

and those of Murphy and Taylor () and Johnson et al. () may be an artifact of model structure, as Murphy and Taylor () modeled the length‐at‐age relationship with a Gompertz model as opposed to the VBGF, which we used. The differences could also be a result of the type of data set used to estimate the individual parameters; both Murphy and Taylor () and Johnson et al.…”

Section: Discussionmentioning

confidence: 75%

“…The differences could also be a result of the type of data set used to estimate the individual parameters; both Murphy and Taylor () and Johnson et al. () used fishery‐dependent data from fisher‐intercept programs conducted during fishing tournaments. These data were likely composed of age and length data from, as our results suggest, generally larger Spotted Seatrout, whereas we used a long‐term set of fishery‐independent data in addition to a set of fishery‐dependent data.…”

Section: Discussionmentioning

confidence: 99%

“…The discrepancy between our estimates of L 1 and those of Murphy and Taylor (1994) and Johnson et al (2011) may be an artifact of model structure, as Murphy and Taylor (1994) modeled the length-at-age relationship with a Gompertz model as opposed to the VBGF, which we used. The differences could also be a result of the type of data set used to estimate the individual parameters; both Murphy and Taylor (1994) and Johnson et al (2011) used fisherydependent data from fisher-intercept programs conducted during fishing tournaments. These data were likely composed of age and length data from, as our results suggest, generally larger Spotted Seatrout, whereas we used a longterm set of fishery-independent data in addition to a set of fishery-dependent data.…”

Section: Estuary Codementioning

confidence: 94%

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Spatial Variability in Size Structure, Growth, and Recruitment of Spotted Seatrout among Six Florida Estuaries

et al. 2019

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Spotted Seatrout Cynoscion nebulosus in Florida, USA, are managed under four geographical regions, including Apalachicola Bay and Cedar Key (northwest region), Tampa Bay and Charlotte Harbor (southwest region), northeast Florida (northeast region), and the northern Indian River Lagoon (southeast region). Two of these management regions are composed of more than one major estuary system (northwest and southwest regions). However, previous life history research suggests that the management regions do not accurately reflect the unique biological populations of Spotted Seatrout in Florida. Our objective was to determine (1) whether there is significant spatial variation in size structure, the age–length relationship, and recruitment patterns among populations of Spotted Seatrout in Florida; and (2) whether there is agreement in these life history parameters among estuary populations comprising individual management regions. We used long‐term fishery‐independent and fishery‐dependent data sets on recruitment, age, and size structure among six estuaries and the four management regions. Young‐of‐the‐year recruitment patterns and the length‐at‐age relationship over all ages differed significantly among estuarine populations and within management regions. Additionally, all estuaries differed significantly in length distributions of Spotted Seatrout caught by the recreational fishery. Our results highlight the need to understand the relative contributions of estuary‐specific data to regional assessment models if the four‐region boundary scheme for Florida is continued. Moreover, as variation in growth and recruitment among estuaries likely reflects estuary‐specific environmental conditions, we suggest that environmental variables be considered in future assessments and management of this recreationally valuable species.

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“…For example, Johnson et al. () used fishery‐dependent data to estimate an

L_{\infty}

of 65.9 cm for Spotted Seatrout in Alabama, which is substantially larger than any

L_{\infty}

value estimated in our study. Additionally, Dippold et al.…”

Section: Discussioncontrasting

confidence: 73%

Section: Estuary Codecontrasting

confidence: 68%

“…The discrepancy between our estimates of

L_{\infty}

Section: Discussionmentioning

confidence: 75%

Section: Discussionmentioning

confidence: 99%

Section: Estuary Codementioning

confidence: 94%

See 3 more Smart Citations

Spatial Variability in Size Structure, Growth, and Recruitment of Spotted Seatrout among Six Florida Estuaries

et al. 2019

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Estimation of the Length‐at‐Age Relationship of Mississippi's Spotted Seatrout

et al. 2016

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Spotted Seatrout Cynoscion nebulosus are a highly valued recreational inshore species in Mississippi coastal waters. The accurate description of the length-at-age relationship is critical for assessment efforts of the stock. Because Spotted Seatrout exhibit small-scale movements, the stocks in the Gulf of Mexico are managed as statespecific units. Therefore, local demographic estimates of length at age are needed for assessment. We estimated the length-at-age relationship of Spotted Seatrout in Mississippi by using tag recapture records and otolith-derived age estimates. Three nonlinear length-at-age models were fit to sex-aggregated, tag recapture data and four nonlinear length-at-age models were fit to sex-specific, otolith-derived age data. For each suite of models, model support was determined using Akaike information criteria. The Francis (1988a) GROTAG method had the greatest support of the three models fit to the tag recapture data, and the resulting parameter estimates from the model were L 1 D 550.8 mm and k D 0.45/year. The three-parameter logistic model had the greatest support of the four models fit to the otolith-derived age data for both males and females and the resulting parameter estimates of L 1 were 605.3 mm TL for females and 574.9 mm TL for males. The results of this study indicate that (1) the Francis (1988a) GROTAG model was the best-supported method for the determination of the von Bertalanffy growth function parameters from tag recapture information, and (2) the von Bertalanffy growth function may not be the best model to describe the length-at-age relationship of Mississippi's Spotted Seatrout. This work highlights the utility of using multiple sources of length-at-age information and fitting multiple models to enhance both the description of the length-at-age relationship and to determine biases that occur in both.

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Evaluation of Internal Tag Performance in Hatchery‐Reared Juvenile Spotted Seatrout

Blaylock

Peterson

2013

N American J Fish Manag

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Stock enhancement programs rely on the ability to recapture and identify stocked fish to evaluate stocking effectiveness. Since 2006, the Seatrout Population Enhancement Cooperative (SPEC) has released almost 600,000 Spotted Seatrout Cynoscion nebulosus, about 100 mm TL, tagged with opercular coded wire tags (CWTs) into coastal Mississippi waters. However, only about 50 fish have been recaptured and initial retention of the opercular CWT has rarely exceeded 75%. This study first evaluated the suitability of visible implant alpha (VIA) and visible implant elastomer (VIE) tags for use in juvenile Spotted Seatrout. The VIA tags performed poorly. Based on those results, the study evaluated the effects of tagging site and fish size on survival, growth, and retention of CWTs and VIE tags and VIE tag fragmentation in juvenile Spotted Seatrout. Three separate growth experiments with juvenile Spotted Seatrout that had mean initial TLs of 93, 138, and 152 mm, respectively, were conducted to assess the effects of tagging. Each growth experiment had nine treatments consisting of a control, fish with either an opercular CWT, a dorsal muscle CWT, a ventral caudal fin VIE tag, or a jaw VIE tag, and four false‐tagged treatments corresponding to each tagged treatment. Dorsal CWTs were retained better than opercular CWTs; VIE tags were equally retained regardless of body location. However, VIE tag quality was affected over the long term by pigmentation overlap and fragmentation. Growth rates and survival were not different within any size‐class experiment or among treatments. This study has shown that CWTs and VIE tags are effective marking methods for juvenile Spotted Seatrout. Received October 11, 2012; accepted May 16, 2013

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Population Changes and Location-Specific Differences for Otolith-Derived Age and Growth of Recreationally Harvested Spotted Seatrout (Cynoscion nebulosus) From Alabama in 2007

Cited by 5 publications

References 24 publications

Spatial Variability in Size Structure, Growth, and Recruitment of Spotted Seatrout among Six Florida Estuaries

Spatial Variability in Size Structure, Growth, and Recruitment of Spotted Seatrout among Six Florida Estuaries

Estimation of the Length‐at‐Age Relationship of Mississippi's Spotted Seatrout

Evaluation of Internal Tag Performance in Hatchery‐Reared Juvenile Spotted Seatrout

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