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Age and Growth of the Finescale Triggerfish, Balistes polylepis (Teleostei: Balistidae), on the Coast of Mazatla´n, Sinaloa, Mexico.

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Title: Age and Growth of the Finescale Triggerfish, Balistes polylepis (Teleostei: Balistidae), on the Coast of Mazatla´n, Sinaloa, Mexico.
Authors: Barroso-Soto, Ithandehui
Castillo-Gallardo, Emerita
Quinonez-Vela´zquez, Casimiro
Mora´n-Angulo, Ramo´n E.
LC Subject Headings: Natural history--Periodicals.
Science--Periodicals
Natural history--Pacific Area--Periodicals.
Issue Date: Jan 2007
Publisher: Honolulu, University of Hawaii Press
Citation: Barroso-Soto I, Castillo-Gallardo E, Quinonez-Vela´zquez C, Mora´n-Angulo RE. Age and Growth of the Finescale Triggerfish, Balistes polylepis (Teleostei: Balistidae), on the Coast of Mazatla´n, Sinaloa, Mexico. Pac Sci 61(1): 121-128.
Series/Report no.: vol. 61, no. 1
Abstract: To estimate the weight-length relationship, determine age, and describe growth of the finescale triggerfish, Balistes polylepis Steindachner, 1876, 552 specimens were measured and weighed, and 318 first dorsal spines were collected from the artisanal catch in Mazatla´n, Sinaloa, Mexico, between October 2000 and October 2001. Fish ranged between 16 and 53 cm in total length (TL), and distribution was biased toward small sizes. Age was assigned according to the number of opaque-hyaline bands in spines, identifying seven age groups (1–7), with age groups 2, 3, and 4 jointly representing over 80% of the collection. The von Bertalanffy model was adequately fitted to the age-TL data and accounted for 91% of the variation in TL. Parameters were estimated as TLy ¼ 55:8 cm; K ¼ 0.17 yr_1, and t0 ¼ _1:7 yr. The total weight (TW) of the finescale triggerfish ranged between 75 and 2,200 g, and the TW-TL relationship showed a negative allometric growth ðb ¼ 2:7Þ. These results are the first reported for age and growth of this species.
Description: v. ill. 23 cm.
Quarterly
Pages/Duration: 8 p.
URI/DOI: http://hdl.handle.net/10125/22602
ISSN: 0030-8870
Appears in Collections:Pacific Science, Volume 61, Number 1, 2007



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