Age and growth

Nash, Richard D.M.; Geffen, Audrey J.

doi:10.1002/9781118501153.ch9

Cited by 7 publications

(11 citation statements)

References 210 publications

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“…Prior to analysis, all ages were incremented by 0.75 so that the change-point estimates corresponded appropriately to the beginning of the year in which the measurements were made. However, as Nash & Geffen (2005) point out, recruit spawners have to build up energy reserves but do not have to recover from depleted body condition from the previous year's spawning. Reproduction will thus have its maximum effect on somatic growth after the first reproductive season.…”

Section: Discussionmentioning

confidence: 99%

Estimating age at first maturity in fish from change-points in growth rate

Rd¹,

Heikkonen²

2012

Mar. Ecol. Prog. Ser.

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Recent studies have drawn attention to the potential for evolutionary changes in lifehistory traits as a consequence of the size-selective process of fishing, and evidence of so-called fisheries-induced evolution has been reported for a number of different species. Most studies of fisheries-induced evolution have focused on changes in sexual maturation using the probabilistic maturation reaction norm method, which requires specific information on the age at which maturation occurs, often derived from macroscopic examination of the gonads. In the absence of sufficiently detailed measurements of maturity it is necessary to derive estimates of the age at which maturation occurs from alternative sources of information, for example, from length at age data. We apply a relatively simple segmented regression model to length at age data for plaice Pleuronectes platessa in the Irish Sea in order to identify the change-point between 2 specific growth schedules that can be used as a proxy for age at first maturity in individual cohorts. We use a Bayesian approach for model fitting and map the resulting distribution of change-points using Gaussian mixture models to show that the age at which the change-point occurred in individual cohorts of both male and female plaice in the Irish Sea has declined progressively over an 18 yr period between 1988 and 2005.KEY WORDS: Plaice · Maturation · Segmented regression · Reaction norm · Genetic adaptation · Phenotypic plasticity 450: 147-157, 2012 ated with reproduction, such as (1) competition for resources required for reproduction, e.g. competition for mates or nest sites; (2) the amount of space within the body cavity that can be allocated to reproductive organs; and (3) the costs of locomotion. In all 3 instances, individuals that become reproductive at a larger size might be expected to have a reduced sizespecific cost of reproduction. A life-history strategy of delayed maturation allowing for increased growth might therefore be considered optimal in terms of maximising reproductive potential, but this must be offset against competing processes such as the predation risk of foraging that might favour an alternative strategy of reduced growth and earlier maturation (Mangel & Stamps 2001). A trade-off therefore exists in the adoption of specific life-history traits that maximise reproductive potential given the competing objectives of increased growth, reduced mortality and reproductive investment. The age at which first maturity occurs is a reflection of the strategic approach that a given species takes to this trade-off and will be highly correlated with other life-history traits, such as growth rate and maximum size. Resale or republication not permitted without written consent of the publisherMar Ecol Prog SerA number of recent studies have drawn attention to the potential for evolutionary changes in life-history traits as a consequence of the size-selective process of fishing (Rijnsdorp 1993, Law 2000, Heino et al. 2002a, and evidence of so-called fisheries-induce...

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Section: Discussionmentioning

confidence: 99%

Estimating age at first maturity in fish from change-points in growth rate

Rd¹,

Heikkonen²

2012

Mar. Ecol. Prog. Ser.

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“…Castilho et al (1993), Vassilopoulou & Ondrias (1999), Robson et al (2000), Bostanci & Polat (2008) and Teixeira et al (2010) reported the longevity limits as 0-12, 0-8, 4-11, 3-8 and 2-9 ages, respectively. Nash & Geffen (2005) stated that the reasons of differences in longevity could be attributed to latitudinal differences as well as to the effects of temperature, intensities of competition for food, food availability, life history strategies and fishing efforts. The maximum age of the four-spotted megrim was reported as 15 (Fuertes, 1978).…”

Section: Discussionmentioning

confidence: 99%

Age and growth of four-spotted megrim (Lepidorhombus boscii Risso, 1810) from Saros Bay (Northern Aegean Sea, Turkey)

et al. 2013

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In this study, the growth parameters of the four-spotted megrim, (Lepidorhombus boscii Risso, 1810), were studied in Saros Bay, which had been closed to bottom trawl fishery since 2000. The sex ratio of females to males was 1:0.42. Length-weight relationships were W=0.0032L3.31 and W=0.0069L3.04 for females and males, respectively. Growth parameters of the populations were L∞=49.8 cm, k=0.09 year-1, t0=-2.15 year for females; L∞=39.1 cm, k=0.11 year-1, t0=-2.59 year for males. The growth performance index (Φ’) was found to be 2.35 and 2.23 for females and males, respectively.

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“…This is unlikely for R. tapirina as water temperatures across southern Australia during spring are relatively low. Furthermore, this is the spawning season for R. tapirina (Crawford 1984;Barnett & Pankhurst 1999), during which higher demands for energy for gonad development are likely to limit growth (Rijnsdorp 1990;Nash & Geffen 2005). As such, opaque zones in the otoliths are likely to correspond to slow otolith growth and to narrower widths of daily increments (Fowler 2009;Mann-Lang & Buxton 1996).…”

Section: Usefulness Of the Otoliths Of R Tapirina For Ageingmentioning

confidence: 99%

“…For the Estuary and North Coorong, there were no differences in growth parameters between males and females. For many flatfish species, sexual dimorphism in growth is characteristic, with females typically attaining larger sizes and living longer than males (Dwyer et al 2003;Fischer & Thompson 2004;Nash & Geffen 2005). However, for R. tapirina, there were no such differences detectable for the first 4 years of life.…”

Section: Growthmentioning

confidence: 99%

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Age validation, growth and population characteristics of greenback flounder (Rhombosolea tapirina) in a large temperate estuary

Earl

Fowler

et al. 2014

New Zealand Journal of Marine and Freshwater Research

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The greenback flounder (Rhombosolea tapirina) is an important fishery species in southern Australia and New Zealand, whose demographic processes are poorly understood. This study developed an ageing protocol based on otolith interpretation and provided estimates of age-based data for an exploited population in the estuary of Australia's largest river system. The otoliths fulfilled three criteria that established their usefulness for ageing. Estimates of size and age were used to generate von Bertalanffy growth curves for male and female fish sampled from two areas within the estuary. There were no differences in growth between the sexes, despite the strong bias in number towards female fish. Spatial differences in growth were marginal. Populations involved only a few young age classes. Such truncation may relate to the fishery, to movement of older fish out of the system, or to recent poor environmental conditions limiting spawning and early life survivorship.

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Age and growth

Cited by 7 publications

References 210 publications

Estimating age at first maturity in fish from change-points in growth rate

Estimating age at first maturity in fish from change-points in growth rate

Age and growth of four-spotted megrim (Lepidorhombus boscii Risso, 1810) from Saros Bay (Northern Aegean Sea, Turkey)

Age validation, growth and population characteristics of greenback flounder (Rhombosolea tapirina) in a large temperate estuary

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