2020
DOI: 10.1071/mf19131
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Filling gaps in the biology and habitat use of two spurdog sharks (Squalus japonicus and Squalus brevirostris) in the East China Sea

Abstract: The conservation and management of sharks requires appropriate information on their biological and habitat characteristics. Data needed for the conservation and management of two dominant demersal shark species in the East China Sea, the spurdogs (Squalus japonicus and Squalus brevirostris), are inadequate. To remedy this, we analysed biological, catch and abiotic data from bottom trawl surveys conducted in 2000–05 and 2008–14 from within the East China Sea. The precaudal length of male and female S. japonicus… Show more

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Cited by 3 publications
(2 citation statements)
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“…To characterize gonadal development, the gonadosomatic index (GSI) was calculated for males and females based on GW divided by BW and multiplied by 100. Individuals were secondarily classified as immature or mature based on clasper condition and the presence of semen in males, and pregnancy status and development of the oviducal gland and ovarian oocytes in females (Yano et al ., 2020).…”
Section: Methodsmentioning
confidence: 99%
See 1 more Smart Citation
“…To characterize gonadal development, the gonadosomatic index (GSI) was calculated for males and females based on GW divided by BW and multiplied by 100. Individuals were secondarily classified as immature or mature based on clasper condition and the presence of semen in males, and pregnancy status and development of the oviducal gland and ovarian oocytes in females (Yano et al ., 2020).…”
Section: Methodsmentioning
confidence: 99%
“…To characterize gonadal development, the gonadosomatic index (GSI) was calculated for males and females based on GW divided by BW and multiplied by 100. Individuals were secondarily classified as immature or mature based on clasper condition and the presence of semen in males, and pregnancy status and development of the oviducal gland and ovarian oocytes in females (Yano et al, 2020). Szöcs and Schäfer (2015) strongly recommended that proportions from counts should be analysed using a generalized linear model (GLM) because proportion data are rarely normally distributed and the use of proportions loses sample size information.…”
Section: Sexual Maturity Assessmentmentioning
confidence: 99%