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dc.contributor.authorSun, Chi-Lu
dc.contributor.authorWang, Sheng-Ping
dc.contributor.authorYeh, Su-Zan
dc.date.accessioned2021-06-24T17:04:27Z
dc.date.available2021-06-24T17:04:27Z
dc.date.issued2002
dc.identifier.issn0090-0656
dc.identifier.urihttp://hdl.handle.net/1834/31104
dc.description.abstractAge and growth of the swordfish (Xiphias gladius) in Taiwan waters was studied from counts of growth bands on cross sections of the second ray of the first anal fin. Data on lower jaw fork length and weight, and samples of the anal fin of male and female swordfish were collected from three offshore and coastal tuna longline fishing ports on a monthly basis between September 1997 and March 1999. In total, 685 anal fins were collected and 627 of them (293 males and 334 females) were aged successfully. The lower jaw fork lengths of the aged individuals ranged from 83.4 to 246.6 cm for the females and from 83.3 to 206 cm for the males.The radii of the fin rays and growth bands on the cross sections were measured under a dissecting microscope equipped with an image analysis system. Trends in the monthly marginal increment ratio indicated that growth bands formed once a year. Thus, the age of each fish was deter-mined from the number of visible growth bands. Two methods were used to estimate and compare the standard and the generalized von Bertalanffy growth parameters for both males and females. The nonlinear least square estimates of the generalized von Bertalanffy growth parameters in method II, in which a power function was used to describe the relationship between ray radius and LJFL, were recommended as most acceptable. There were significant differences in growth parameters between males and females. The growth parameters estimated for females were the following: asymptotic length (L∞) = 300.66 cm, growth coefficient (K) = 0.040/yr, age at zero length (t0) = –0.75 yr, and the fitted fourth parameter (m) = –0.785. The growth parameters estimated for males were the following: asymptotic length (L∞) = 213.05 cm, growth coefficient (K) = 0.086/yr, age at zero length (t0) = –0.626 yr, and the fitted fourth parameter (m) = –0.768.
dc.formatapplication/pdf
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.relation.urihttp://fishbull.noaa.gov/1004/14sunfis.pdf
dc.subject.otherBiology
dc.subject.otherFisheries
dc.titleAge and growth of the swordfish (Xiphias gladius L.) in the waters around Taiwan determined from anal-fin rays
dc.typearticle
dc.bibliographicCitation.issue4
dc.bibliographicCitation.titleFishery Bulletin
dc.bibliographicCitation.volume100
dc.format.pagerange822-835
dc.type.refereedTRUE
refterms.dateFOA2021-06-24T17:04:27Z
dc.source.legacyrecordurlhttp://aquaticcommons.org/id/eprint/15252
dc.source.legacydepositorid403
dc.source.legacylastmod2014-05-30 21:11:39
dc.source.legacyid15252
dc.source.legacyagencyUnited States National Marine Fisheries Service


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