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Estimating Daily Egg Production of European Anchovy in the Adriatic Sea: A Critical Appraisal
Author(s) -
Melià Paco,
Casavola Nicola,
Gatto Marino
Publication year - 2002
Publication title -
marine ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.668
H-Index - 58
eISSN - 1439-0485
pISSN - 0173-9565
DOI - 10.1111/j.1439-0485.2002.tb00025.x
Subject(s) - engraulis , anchovy , stock assessment , pelagic zone , fishery , stock (firearms) , calibration , environmental science , production model , production (economics) , oceanography , econometrics , statistics , biology , geography , mathematics , fish <actinopterygii> , economics , geology , fishing , archaeology , macroeconomics
. We discuss the critical problem of estimating daily egg production in the Daily Egg Production Method (DEPM), a widely used technique for the stock assessment of multiple spawning pelagic fishes. Data collected in 1999 for the stock of European anchovy ( Engraulis encrasicolus ) in the Southern Adriatic Sea are used to study the effects of different calibration techniques. We analyze the performances of the mortality model from which daily egg production is estimated. All these calibrations are based on the Bootstrap method. Nonlinear fitting (vs. linear regression on log‐transformed data) is shown to guarantee more reliable parameter estimation. We show that specifying the function assigning age to staged eggs is crucial.