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1
題名:Age and Growth Estimates of the Blacktip Sawtail Catshark Galeus sauteri in Northeastern Waters of Taiwan    
著者:Kwang-Ming LiuChia-Ping LinShoou-Jeng JoungShyh-Bin Wang
出版地區:台灣
出版城市:台北市
學科:生命科學 ; 醫學綜合
關鍵字:Life history parameters ; Vertebra ; Robertson function ; Bootstrap method ; Longevity
刊名:Zoological Studies
頁碼:284-295
語言:英語
摘要: 英文摘要PDF

The blacktip sawtail catshark Galeus sauteri is a small, demersal species that inhabits tropical and subtropical coastal waters of the western Pacific region. It is one of the most important small shark species in terms of catch biomass for the trawl fishery in Taiwanese waters, but its stock status is poorly known. In this study, age and growth of this species were described from 739 specimens (388 females and 351 males, 8.5-49.8 cm in total length; TL) collected from Nov. 2007 to Oct. 2008 in waters off northeastern Taiwan by demersal or shrimp trawlers. Sex-specific relationships between the weight (TW) and TL significantly differed and could be expressed as: TW=2.09×10-3TL3.10 (n=1052, p<0.05) for females and TW=3.45×10-3TL294 (n=884, p<0.05) for males. Age was determined using band-pair reading of sectioned vertebrae. A single growth band pair (comprising translucent and opaque bands) is formed each year, and up to 14 and 12 band pairs were respectively observed for females and males. An edge analysis indicated that the translucent bands formed from July to Aug. Four growth functions, the traditional von Bertalanffy (VBGF), VBGF with a fixed size-at-birth (Lo), Gompertz, and Robertson (logistic) were used to model the observed length-at-age data. The sex-specific growth equations significantly differed. The logistic function had the best fit for both sexes, and the growth parameters including the 95% confidence intervals with a bootstrap method were estimated as follows: asymptotic length L=48.30 (47.16-49.47) cm TL, and growth coefficient k=0.374 (0.344-0.402) yr-1 for females, L=44.29 (42.91-45.88) cm TL and k=0.392 (0.356-0.429) yr-1 for males. The ages at maturity were respectively estimated to be 9.14 and 7.57 yr for females and males, by substituting the mean sizes at maturity into the Robertson growth equation. Longevities of females and males were respectively estimated to be 20.9 and 12.4 yr.


    

本卷期目次
Zoological Studies
Is Ovophis okinavensis Active only in the Cool Season? Temporal Foraging Pattern of a Subtropical Pit Viper in Okinawa, Japan/ Yohei Kadota
Coral Reefs and Communities of Qeshm Island, the Persian Gulf/ Javid KavousiJafar SeyfabadiHamid RezaiDouglas Fenner
Age and Growth Estimates of the Blacktip Sawtail Catshark Galeus sauteri in Northeastern Waters of Taiwan/ Kwang-Ming LiuChia-Ping LinShoou-Jeng JoungShyh-Bin Wang
Reproductive Biology of the Needlefish Tylosurus acus melanotus in Waters around Hsiao-Liu-Chiu Island, Southwestern Taiwan/ Yih-Yia LiaoYu-Hsin Chang
Clutch and Egg Sizes of Two Migratory Forms of the Threespine Stickleback Gasterosteus aculeatus in Eastern Hokkaido, Japan/ Manabu Kume
Population Density and Habitat Use of the Introduced Eastern Cottontail (Sylvilagus floridanus) Compared to the Native European Hare (Lepus europaeus)/ Sandro BertolinoAurelio PerroneLaura GolaRamona Viterbi
Distribution and Status of the Guiana Dolphin Sotalia guianensis (Cetacea, Delphinidae) Population in Babitonga Bay, Southern Brazil/ Marta J. CremerFernando A. S. HardtAntonio J. Tonello JrPaulo Cesar Simoes-Lopes
Early-Stage Evolution of the Neo-Y Chromosome in Drosophila albomicans/ Chia-Hao ChengChing-Ho ChangHwei-Yu Chang
New Species of Octocorals (Coelenterata: Anthozoa) from the Penghu Archipelago, Taiwan/ Yehuda BenayahuLeendert Pieter van Ofwegen
Shallow-Water Brachycnemic Zoanthids (Cnidaria: Hexacorallia) from Taiwan: A Preliminary Survey/ James D. ReimerMasami ObuchiYuka IreiTakuma FujiiYoko Nozawa
Does Petrolisthes armatus (Anomura, Porcellanidae) form a Species Complex or Are We Dealing with Just One Widely Distributed Species?/ Fernando L. MantelattoLeonardo G. PileggiIvana MirandaIngo S. Wehrtmann
Comparative Analysis of the Mitochondrial Control Region in Orthoptera/ Ling ZhaoZhe-Min ZhengYuan HuangZhi-Jun Zhou Li Wang
Domination and Disappearance of the Black Sponge: A Quarter Century after the Initial Terpios Outbreak in Southern Japan/ James D. ReimerYoko NozawaEuichi Hirose
Pumping Water or Producing Larvae? Oscula Occlusion during the Reproductive Period of the Sponge Svenzea zeai/ Susanna Lopez-LegentilXavier Turon
When Does the Window Close?: The Onset of Allogeneic Fusion 2-3 Years Post-Settlement in the Scleractinian Coral, Echinophyllia aspera/ Yoko NozawaMamiko Hirose
 
   
 
   

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