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Growth of the brittle star Ophiura sarsii sarsii in Funka Bay, Hokkaido, Japan

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Title: Growth of the brittle star Ophiura sarsii sarsii in Funka Bay, Hokkaido, Japan
Authors: Orino, Kazuki Browse this author
Ishigane, Kosuke Browse this author
Suzuki, Kota Browse this author
Izumiura, Hiroki Browse this author
Nakaya, Mitsuhiro Browse this author →KAKEN DB
Takatsu, Tetsuya Browse this author →KAKEN DB
Keywords: Age validation
Growth equation
Growth rate
Ophiuroidea
Disc diameter
Issue Date: 11-Jun-2019
Journal Title: Fisheries Science
Volume: 85
Start Page: 705
End Page: 716
Publisher DOI: 10.1007/s12562-019-01323-1
Abstract: The brittle star Ophiura sarsii with a disc diameter (DD) of less than 9 mm is an important prey item for flathead flounder Hippoglossoides dubius in Funka Bay. To establish an age-determination technique and estimate the growth equation for Ophiura sarsii sarsii (a dominant sub-species of O. sarsii in Funka Bay), we observed ridges on the surface of the arm ossicles. Specimens were collected using a sledge net, their DD measured, and the first arm ossicles examined from scanning electron microscopy images. Because the outermost ridges were formed from November to March, ridges were identified as yearly rings (annuli). The maximum age was 16.83 years (16.46-mm DD), and the largest sized individual was 22.19-mm DD (13.75 years). The best growth equation between DD and age (t) was given by Richard’s model using a minimum Akaike’s information criterion and growth rate comparison: DDt= 24.02 × {1 − 1.70 × exp[− 0.067 × (t + 8.25)]}^−1/(−1.70). Small-sized (< 9-mm DD) and large-sized (ca. 15-mm DD) cohorts were composed of multi-year classes, and estimated growth rates from cohort progressions were 2.25 mm/year and 0.98 mm/year, respectively. We presumed that the large-sized cohort could be explained by a high survival rate and slow growth rate after the age of 5 or 6 years.
Rights: © 2019 公益社団法人日本水産学会
The final publication is available at www.springerlink.com.
© 2019 The Japanese Society of Fisheries Science
Type: article (author version)
URI: http://hdl.handle.net/2115/78529
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 高津 哲也

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