Estrutura etária e mortalidade do linguado branco, Paralichthys patagonicus, (Jordan, 1889) no sul do Brasil

Araújo, Júlio Neves de; Haimovici, Manuel

doi:10.1590/s1413-77392000000100006

Cited by 3 publications

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References 4 publications

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“…Estimated exploitation rates indicate that the catches of C. guatucupa were higher than sustainable even for a non-conservative goal (E = 0.5) and for instantaneous natural mortality coeficient ranging from 0.20 to 0.30 year -1 , at least since the beginning of the 1980s ( for females and 0.42 year -1 for males, whose maximum observed ages were 13 and 11, respectively (Araú jo & Haimovici, 2000) and higher than estimated for U. canosai, around 0.20 year -1 , with a life expectancy over 20 years (Haimovici & Reis, 1984). Correlation of total mortality coefficients from catch curves against time was relatively high and suggest that there was not pronounced recruitment variation that should result in low correlations or concave catch curves (Ricker, 1975).…”

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confidence: 99%

Changes in the population structure, growth and mortality of striped weakfish Cynoscion guatucupa (Sciaenidae, Teleostei) of southern Brazil between 1976 and 2002

Miranda

Haimovici

2007

Hydrobiologia

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Changes in the population structure, growth, and mortality of the striped weakfish Cynoscion guatucupa of southern Brazil were studied based on data collected from commercial landings in Rio Grande between 1976 and 2002. Mean length in the trawl fishery decreased abruptly while mean ages decreased steadily in recent years. Most abundant age classes in recent landings were 2 and 3 years old in the paired-trawl catches, one to three for otter and double rig trawls, and 5 and 6 years old in the gill net catches. Oldest fishes caught were aged 18 years and no fish over 14 years old was caught since 1985. The growth rate tended to increase over the course of the study, especially in the last analysed period (1999)(2000)(2001)(2002). The total mortality instantaneous coefficient Z calculated from the paired trawls data catch curves increased from 0.36 in 1976 up to 0.92 in 2002 and the exploitation rate E increased from 0.31 up to 0.73 if a natural mortality coefficient M of 0.25 is assumed. The changes were attributed to the increase of the fishing on the striped weakfish stock, shared by Brazil, Uruguay and Argentina and are suggestive of overfishing.

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Section: Discussionmentioning

confidence: 99%

Changes in the population structure, growth and mortality of striped weakfish Cynoscion guatucupa (Sciaenidae, Teleostei) of southern Brazil between 1976 and 2002

Miranda

Haimovici

2007

Hydrobiologia

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Contribution of ecosystem analysis to investigating the effects of changes in fishing strategies in the South Brazil Bight coastal ecosystem

Gasalla

Rossi-Wongtschowski

2004

Ecological Modelling

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Patterns of reproduction and growth of the catfishIheringichthys labrosus(Lütken, 1874) after a reservoir formation

2016

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Summary This work contributes to the knowledge of the reproduction, growth parameters and mortality rates of Iheringichthys labrosus in a newly‐formed reservoir. A total of 554 males and 1227 females were collected over 12 consecutive months, 1998–1999, from sites in the Corumbá Reservoir, Brazil, using gillnets (meshes: 2.4–16 cm). Information on each individual, i.e. standard length (cm), weight (g), sex, and gonadal development phase was recorded. The pectoral spines were removed to estimate age. The number of juveniles and adults, males and females, reproductive sites and seasons were estimated. First maturation length was estimated using a likelihood function fitted by binomial distribution. Growth parameters were estimated using the von Bertalanffy equation. Total instantaneous mortality was obtained through a linearized catch curve method. Standard length varied from 6.0 to 20.5 cm. Growth showed negative allometry for both sexes. The reproduction period was August to December in all environments sampled and first maturation length was 11.5 cm. All individuals were adults with 17.0 cm standard length. Ages varied from zero to 7 years. Asymptotic length, growth coefficient and t0 for the entire population were 27.79 cm, 0.12 and −2.64, respectively. Instantaneous and annual mortality rates were 0.90 and 0.59, respectively.

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Estrutura etária e mortalidade do linguado branco, Paralichthys patagonicus, (Jordan, 1889) no sul do Brasil

Cited by 3 publications

References 4 publications

Changes in the population structure, growth and mortality of striped weakfish Cynoscion guatucupa (Sciaenidae, Teleostei) of southern Brazil between 1976 and 2002

Changes in the population structure, growth and mortality of striped weakfish Cynoscion guatucupa (Sciaenidae, Teleostei) of southern Brazil between 1976 and 2002

Contribution of ecosystem analysis to investigating the effects of changes in fishing strategies in the South Brazil Bight coastal ecosystem

Patterns of reproduction and growth of the catfishIheringichthys labrosus(Lütken, 1874) after a reservoir formation

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