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Fisheries Research, 2010
Abstract Understanding the spatial–temporal distributions of fish populations is important for their assessment and management. Given the complex structure often present in fisheries length–frequency samples, there is a need for flexible statistical techniques to explore patterns with these types of data.
Cleridy E. Lennert-Cody +3 more
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Abstract Understanding the spatial–temporal distributions of fish populations is important for their assessment and management. Given the complex structure often present in fisheries length–frequency samples, there is a need for flexible statistical techniques to explore patterns with these types of data.
Cleridy E. Lennert-Cody +3 more
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Comparison of methods used to convert length-frequency data
Fisheries Research, 1997Three methods to convert length-frequency data from Total to Fork length were compared. Datasets from two teleost species, the panga Pterogymnus laniarius (with a forked tail) (n = 1500) and lesser gurnard Chelidonichthys queketti (with an emarginate tail) (n = 649) were constructed from observed total and fork length measurements to determine the ...
Anthony J. Booth, Edwin D. Isted
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Evaluation of management procedures for a length-frequency data-limited fishery
Environmental Science and Pollution Research, 2019Management procedures (MPs) based on data-limited methods (DLMs) recently developed to give management advices for data-limited stocks worldwide are scarce or yet to be implemented on freshwater species. In this study, case studies (CSs) were developed using length-frequency data (LFD) of common carp species harvested from Dianshan Lake to estimate ...
Richard Kindong +7 more
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Ageing with fisheries length‐frequency data, using information about growth
Journal of Fish Biology, 1989A new approach to break down fisheries length‐frequency data into age groups, using information on relative growth rate with age, is introduced. The method was verified with data used to test previously published methods. Good starting values for the mean lengths of the fish with age in the statistical analysis of distribution mixtures are often ...
Q. Liu, T. Pitcher, M. Al‐Hossaini
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Estimation of change in lifetime egg production from length frequency data
Canadian Journal of Fisheries and Aquatic Sciences, 2005The percentage of unfished lifetime egg production (LEP) has been used to represent persistence in precautionary fisheries management, but estimation of this reference point requires substantial data and it is sensitive to errors in natural mortality rate.
Michael R O'Farrell, Louis W Botsford
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Estimating The Status Of Nearshore Rockfish (SebastesSpp.) Populations With Length Frequency Data
Ecological Applications, 2006Ecologists often point to excessive truncation of a population's size-structure as a deleterious effect of exploitation, yet the effect of this truncation on population persistence is seldom quantified. While persistence of marine populations requires maintenance of a sufficient level of lifetime reproduction, fishing reduces lifetime reproduction by ...
Michael R, O'Farrell, Louis W, Botsford
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Effect of individual variability on estimation of population parameters from length-frequency data
Canadian Journal of Fisheries and Aquatic Sciences, 1998We consider estimation of mortality rates and growth parameters from length-frequency data of a fish stock when there is individual variability in the von Bertalanffy growth parameter Linfinity and investigate the possible bias in the estimates when the individual variability is ignored.
Wang, Y. G., Ellis, N.
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Sample size and grouping of data for length-frequency analysis
Fisheries Research, 1990Abstract A modified Bhattacharya method was used to analyze simulated length-frequency distributions in four different sample sizes (100, 200, 500 and 1000) and 20 interval sizes (2, 3, …, 20 and 50 mm). The relationships between optimum interval size, sample size, range and various biological characteristics were investigated.
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