• Communications for Statistical Applications and Methods
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• v.10 no.3
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• pp.919-930
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• 2003

Mark-Recapture method for open population commonly use Jolly-Seber method. This method assumes that all animals are equally likely to be caught in each sample (the equal catchability). This objects are making introduction of Mark-Recapture method for open population and using the robust design that combine a open population method with close population method to solve upper problems. Then population growth rate estimators that are derived Pollock's Jolly-Seber parameters and Kendall's Jolly-Seber parameters are estimated.

• Korean Journal of Ecology and Environment
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• v.57 no.3
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• pp.134-147
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• 2024

Present study investigated fish community at 12 sites within Yudeungcheon Stream in October 2018 and May 2019 to understand the inhabit status of the endangered species Pseudopungtungia nigra. We collected 39 species and 2,554 individuals of fish, and the Fish Assessment Index (FAI) was evaluated as "Good (B)" with an average score of 66.8. Among collected fishes, 15 endemic and 2 invasive species, Micropterus salmoides and Lepomis macrochirus were identified. In the distribution survey of P. nigra, it appeared in a range of approximately 12 km from Maebawiyuwonji Park (St. 5) to Budnaedari Bridge (St. 10). Based on population collected in May, the age of P. nigra (female) were divided into three groups by the length-frequency distribution method: 1 year old (60~76 mm), 2 years old (82~99 mm), and more than 3 years old (100~117 mm). Total length of the minimum maturity individual was 60 mm, and was a 1 year old. The estimated average population size using the Jolly-Seber method was 5,804 individuals in the Suryeongyo Bridge. Our study provides fundamental information about the fish community and River health assessment in Yudeungcheon Stream. Furthermore, we are expected to provide ecological information of the P. nigra, consequently helping to establish conservation and restoration plans for endangered species.