Estimating fish length and age at 50% maturity using a logistic type model

Chen, Y.; Paloheimo, J. E.

doi:10.1007/bf00879965

Cited by 82 publications

(55 citation statements)

References 10 publications

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“…In fisheries science, maturation is usually described by two indices: the age at which 50% of individuals are mature (A 50 ), and the length at which 50% of individuals are mature (L 50 ) (Jørgensen 1990, Chen and Paloheimo 1994, Morgan and Colbourne 1999, O'Brien 1999. In many fish stocks these indices suggest that maturation schedules have changed during the last 30 years: fish reproduce younger and younger, and at smaller and smaller sizes (Jørgensen 1990, Rijnsdorp 1993a, b, Morgan et al 1999, O'Brien 1999.…”

Section: Introductionmentioning

confidence: 99%

Long‐term Trend in the Maturation Reaction Norm of Two Cod Stocks

Barot

Heino

O’Brien

et al. 2004

Ecological Applications

125

129

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Abstract. Average age and size at maturation have decreased in many commercially exploited fish stocks during the last decades. This phenomenon could be either a direct phenotypic response to some environmental variation or the evolutionary consequence of some selective pressure. Traditionally used maturation indices, e.g., the age and size at which 50% of individuals are mature, are not appropriate to assess the causes of changes in maturation because they are influenced, in addition to maturation per se, by growth and survival. To make up for this shortcoming, we use a reaction-norm-based approach to disentangle evolutionary changes and phenotypic plasticity. A method is presented to estimate the reaction norm for age and size at maturation from data commonly gathered for the management of fisheries. This method is applied to data on Georges Bank and Gulf of Maine stocks of Atlantic cod (Gadus morhua). The results show that maturation reaction norms in these stocks have shifted significantly downward, resulting in a tendency to mature earlier at smaller size. These findings support the hypothesis that an evolutionary trend, probably caused by high fishing mortalities, is partially responsible for the observed decrease in age and size at maturation in these cod stocks. Two independent reasons justify this interpretation. First, there is no corresponding trend in growth that would suggest that improved feeding conditions could have facilitated maturation. Second, the results are based on maturation reaction norms, from which the known confounding effects of the growth and mortality variation are removed. Consequences of fisheries-induced evolution for the sustainability of the fishery are discussed.

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Section: Introductionmentioning

confidence: 99%

Long‐term Trend in the Maturation Reaction Norm of Two Cod Stocks

Barot

Heino

O’Brien

et al. 2004

Ecological Applications

125

129

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show abstract

“…Biological parameters, including age, growth, mortality and age (or size) at maturity are vital for more reliable stock assessments and management plans, and to ensure a sustainable development of the fisheries (CHEN & PALOHEIMO 1994). Age and growth information of yellowfin tuna can be obtained from a variety of techniques such as (a) length modes (MOORE 1951, YABUTA & YUKINAWA 1957, 1959, HENNEMUTH 1961, YOKOTA et al 1961, DAVIDOFF 1963, LE GUEN & SAKAGAWA 1973, FONTENEAU 1980, WANKOWSKI 1981, WHITE 1982, YESAKI 1983, INGLES & PAULY 1984, (b) weight modes (KIMURA 1932, MOORE 1951 and (c) direct aging of calcified tissues such as otoliths (UCHIYAMA & STRUHSAKER 1981, WILD 1986, YAMANAKA 1990, scales (NOSE et al 1957, YABUTA et al 1960, YANG et al 1969, LE GUEN & SAKAGAWA 1973, DRAGANIK & PELCZARSKI 1984, LESSA & DUARTE-NETO 2004 and vertebrae (AIKAWA & KATO 1938, TAN et al 1965.…”

mentioning

confidence: 99%

Growth and mortality rates of yellowfin tuna, Thunnus albacares (Perciformes: Scombridae), in the eastern and central Pacific Ocean

Zhu¹,

Xu²,

Dai³

et al. 2011

Zoologia (Curitiba, Impr.)

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“…L m50 % was estimated based on the logistic model: P ¼ 1 ð1 þ e kÂðL tmid ÀL m50% Þ Þ, which has been successfully used to estimate size at 50 % maturity for many species [28][29][30][31]. P is the proportion of sexually mature individuals in each size group (10 mm intervals), L tmid is the mid-point of the body length class and k is a fitted parameter.…”

Section: Discussionmentioning

confidence: 99%

Reproductive characteristics of Ancherythroculter nigrocauda, an endemic fish in the upper Yangtze River, China

et al. 2013

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Knowledge on the reproductive biology of fishes is critical for understanding a species' life history and devising appropriate management strategies. Anthropogenic forces, such as damming and overfishing, threaten fishes endemic to the upper Yangtze River. We conducted a study on the reproductive biology of an endemic species, Ancherythroculter nigrocauda in order to provide information on the life history of this species and to assist in its conservation. From July 2011 to June 2012, a total of 417 fishes were captured via monthly sampling by fishermen in the Longxi River, a tributary in the upper Yangtze River. Although the female-male ratio was 1:1.03, females were predominantly larger in body size. Gonad somatic indices and oocyte diameter distribution showed that the spawning period of A. nigrocauda in the Longxi River ranged from April to August, with the peak in April. Body length at 50 % sexual maturity of A. nigrocauda was estimated to be 125 and 106 mm for females and males, respectively. Absolute fecundity of A. nigrocauda varied between 11,300 and 504,630 eggs, with the mean of 162,377 eggs. In conclusion, A. nigrocauda mature early, spawn once, and are highly fecund, all of which are consistent with an r-selected life history. It is recommended that a moratorium on fishing this species be enacted and the culture of this species be continued.

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Estimating fish length and age at 50% maturity using a logistic type model

Cited by 82 publications

References 10 publications

Long‐term Trend in the Maturation Reaction Norm of Two Cod Stocks

Long‐term Trend in the Maturation Reaction Norm of Two Cod Stocks

Growth and mortality rates of yellowfin tuna, Thunnus albacares (Perciformes: Scombridae), in the eastern and central Pacific Ocean

Reproductive characteristics of Ancherythroculter nigrocauda, an endemic fish in the upper Yangtze River, China

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