Are Growth Parameters Estimated from Tagging and Age–Length Data Comparable?

Francis, R. I. C. C.

doi:10.1139/f88-115

Cited by 192 publications

(168 citation statements)

References 5 publications

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“…Rather L ∞ is the asymptote for the model of average length-at-age (Francis 1988). As with any average, some individuals will be larger than average; thus, some animals will be larger than L ∞ .…”

Section: "Typical" Von Bertalanffy Growth Model 21 the Model And Parmentioning

confidence: 99%

The Age of Plethodontid Salamanders: A Short Review on Longevity

Staub¹

2016

Copeia

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Section: "Typical" Von Bertalanffy Growth Model 21 the Model And Parmentioning

confidence: 99%

The Age of Plethodontid Salamanders: A Short Review on Longevity

Staub¹

2016

Copeia

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“…Superimposing the Bon- aire juvenile and IP growth curves on those obtained from Los Roques revealed very similar patterns of average growth at each locality over the first 8 yr of life. However, given the different methodologies used to establish each growth curve, it was not possible to make formal comparisons of the growth parameters (Francis 1988). The growth curves derived from repeated visual censuses and mark-recapture of Sparisoma viride in the Bonaire populations gave no indication of maximum age attained (van Rooij et al 1995a).…”

mentioning

confidence: 99%

An age-based demographic analysis of the Caribbean stoplight parrotfish Sparisoma viride

Choat¹,

Robertson²,

Ackerman³

et al. 2003

Mar. Ecol. Prog. Ser.

101

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The parrotfish Sparisoma viride is an abundant and ecologically important member of the tropical NW Atlantic reef fish fauna. Sagittal otoliths of 417 individuals were analysed to estimate age-based demographic variables at 4 localities (Lee Stocking Island, Barbados, Los Roques Archipelago and the San Blas Archipelago) spanning 14°of latitude. The sampling localities ranged from an area protected from trap-and net-based reef fisheries (Los Roques) to an area supporting a dense human population and sustained trapping and spearing for reef fishes including S. viride (Barbados). Examination of sectioned sagittal otoliths from each locality revealed regular increments in the sagittal matrix. A preliminary validation at San Blas was consistent with these increments being annual check marks. These increments provided estimates of age structure, maximum longevities and mortality rates for the 4 study populations of S. viride. Von Bertalanffy growth functions fitted to each size-at-age plot generated similar growth curves from 3 of these 4 localities. The exception was Lee Stocking, where fish grew faster and reached a substantially larger size than those from the other 3 localities. Further analysis of the growth curves demonstrated that the differences between Lee Stocking and the other localities were attributable to more rapid growth over the first 4 yr of life. Agebased growth curves derived from the Los Roques population were very similar to a size-based curve generated by an independent study on S. viride carried out in Bonaire, adjacent to Los Roques. Maximum longevities for all 4 of our populations varied from 7 to 9 yr. Mortality rates generated from catch curve analysis were also similar among localities and suggest that maximum life spans do not exceed 12 yr. This result differs from that obtained at Bonaire, where repeated censuses of tagged fish suggest 30 yr maximum longevity. Abundances of S. viride varied 3-fold among localities, being highest at Los Roques (protected from reef fishing), lowest at Barbados (high fishing) and Lee Stocking (low fishing). Thus our age-based study suggests that S. viride is a relatively short-lived fish with consistent demographic parameters over a range of localities, latitudes and fishing intensities.

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“…That study estimated L ∞ to be 209 cm FL and k to be 0.077 for both sexes combined, which entails a smaller growth coefficient and a larger asymptotic length than our model fits for both sexes combined over both time periods (Table 1). However, caution should be taken with estimates based on tag-recapture data because the variability in the growth of tagged fish is not comparable to the variability associated with length-at-age data and should not be used to verify length-at-age data (Francis 1988).…”

Section: Discussionmentioning

confidence: 99%

Compensatory Growth of the Sandbar Shark in the Western North Atlantic Including the Gulf of Mexico

Romine

Musick²,

Johnson³

2013

Mar Coast Fish

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The number of Sandbar Sharks Carcharhinus plumbeus in the western North Atlantic Ocean has experienced a drastic decline since the early 1980s, reaching a minimum during the early 1990s. Catch rates in the early 1990s were a mere 25% of those during the 1980s. According to several fishery‐independent surveys, the low point in Sandbar Shark abundance followed a period of high exploitation. Growth models fit to age–length data collected from 1980 to 1983 and from 2001 to 2004 were compared to investigate potential changes in parameter estimates that might reveal compensatory responses in the Sandbar Shark population. Statistical differences were found between the model parameters for the two time periods, but the differences in growth rates were minimal. The parameters from the three‐parameter von Bertalanffy growth model for female sharks during the 1980–1983 and 2000–2004 time periods were as follows: L∞ = 188.4 and 178.3 cm FL; k = 0.084 and 0.106; and t 0 = −4.097 and −3.41. For males the growth parameters were as follows: L∞ = 164.63 and 173.66 cm; k = 0.11 and 0.11; and t 0 = −3.62 and −3.33. The estimated age at 50% maturity for female Sandbar Sharks changed from 15 years to 12.49 years between the two time periods. Received December 21, 2012; accepted March 28, 2013

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Are Growth Parameters Estimated from Tagging and Age–Length Data Comparable?

Cited by 192 publications

References 5 publications

The Age of Plethodontid Salamanders: A Short Review on Longevity

The Age of Plethodontid Salamanders: A Short Review on Longevity

An age-based demographic analysis of the Caribbean stoplight parrotfish Sparisoma viride

Compensatory Growth of the Sandbar Shark in the Western North Atlantic Including the Gulf of Mexico

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