Age and Growth of the Neptunea (Barbitonia) arthritica cumingii in the West Sea of Korea

The age and growth of Neptunea (Barbitonia) arthritica cumingii sampled from the West Sea of Korea were determined from 1,062 operculums from October 2007 to September 2008. Age of Neptunea (Barbitonia) arthritica cumingii was determined from the rings on the operculum. The relationship between shell height (SH; mm) and shell width (SW; mm) was expressed by the following equation : SW = 0.5757 SH + 0.222 ($R^2$ = 0.8723), and shell height (SH; mm) and total weight (TW; g) was highly correlated by the equation : TW = 0.0002 $SH^{2.8162}$ ($R^2$ = 0.9121). The main spawning periods was estimated June to July through fatness index analysis. The relationship between shell height and ring radius of operculum in each ring group was expressed as a regression line. Therefore, there is a correspondence in each ring formation. Based on the monthly variations in the marginal index (MI) of the operculum, it is assumed that the ring of this species was formed once a year during the period of July to August. Growth curves for shell height (SH) and total weight (TW) fitted to the von Bertalanffy's equation were expressed as follows : $$SH_t=173.964(1-e^{-0.164(t+1.173)})$$ $$TW_t=407.952(1-e^{-0.164(t+1.173)})^{2.8162}$$

한국 서해안 갈색띠매물고둥, Neptunea (Barbitonia) arthritica cumingii의 연령과 성장

본 연구는 2007년 10월부터 2008년 9월까지 전라북도 군산시 고군산군도에서 통발어구로 채취된 갈색띠매물고둥을 조사하였다. 갈색띠매물고둥의 뚜껑에 나타난 윤문은 년 1회 형성되며 주 윤문 형성시기는 7월에서 8월로 조사되었으며, 초륜 형성기간은 12개월 (1년) 로 나타났다. 각고 (SH) 에 대한 각폭 (SW) 의 성장식은 SW = 0.5757 SH + 0.222 ($R^2$ = 0.8723), 총중량 (TW) 의 상대성장식은 TW = 0.0002 $SH^{2.8162}$ ($R^2$ = 0.9121) 과 같이 나타낼 수 있었다. 연령 (t) 에 대한 각고 (SH) 와 총중량 (TW) 의 von Bertalanffy 성장식은 다음과 같다. $$SH_t=173.964(1-e^{-0.164(t+1.173)})$$ $$TW_t=407.952(1-e^{-0.164(t+1.173)})^{2.8162}$$