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Age and Growth of the Leopard Grouper, Mycteroperca rosacea, in the Southern Gulf of California, Mexico

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Title: Age and Growth of the Leopard Grouper, Mycteroperca rosacea, in the Southern Gulf of California, Mexico
Authors: Diaz-Uribe, J Gabriel
Elorduy-Garay, Juan F.
Gonzalez-Valdovinos, M Teresa
Issue Date: Apr 2001
Publisher: University of Hawai'i Press
Citation: Diaz-Uribe JG, Elorduy-Garay JF, Gonzalez-Valdovinos MT. 2001. Age and growth of the leopard grouper, Mycteroperca rosacea, in the southern Gulf of California, Mexico. Pac Sci 55(2): 171-182.
Abstract: Growth of the leopard grouper, Myeteroperca rosacea (Streets, 1877),
was analyzed in its natural habitat. Age determination was based on the reading
of otoliths, and the method was validated under three main criteria: (1) proportionality,
(2) seasonality, and (3) concordance with another method. Otolith
growth is proportional to organism growth, with a slight degree of allometry,
and the otolith registers the growth of the individual, even at advanced ages.
The opaque growth zone in the otolith is deposited once a year, between July
and October. Thus, taken together, one opaque and one hyaline mark represent
an annual cycle. Back-calculated lengths-at-age agreed reasonably well with observed
lengths-at-age at the time of capture, considering that back-calculated
lengths represent an exact age (birthday), and observed lengths are taken at an
intermediate age between birthdays. Fish length and otolith age data were fitted
to the von Bertalanffy growth function by two methods: (1) linear regression
(Ford-Walford and Beverton), using transformed data, and (2) nonlinear regression,
by iteration. Although the nonlinear regression gave a fit with unbiased
error, parameters resulting from linear regressions had a better biological
meaning for the species. The resulting parameters were compared with those
reported for other species of the family Serranidae.
ISSN: 0030-8870
Appears in Collections:Pacific Science Volume 55, Number 2, 2001

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