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Title: Age and Growth of the Finescale Triggerfish, Balistes polylepis (Teleostei: Balistidae), on the Coast of Mazatla´n, Sinaloa, Mexico. 
Author: Barroso-Soto, Ithandehui; Castillo-Gallardo, Emerita; Quinonez-Vela´zquez, Casimiro; Mora´n-Angulo, Ramo´n E.
Date: 2007-01
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.
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.
Series/Report No.: vol. 61, no. 1
Description: v. ill. 23 cm. Quarterly
Pages/Duration: 8 p.
ISSN: 0030-8870
URI: http://hdl.handle.net/10125/22602
LC Subject Headings: Natural history--Periodicals.
Science--Periodicals
Natural history--Pacific Area--Periodicals.

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