Growth performance and pathological survey on Manila clam Ruditapes phijippinarum raised on intertidal bottom and subtidal suspended net cages in Korean waters

Title
Growth performance and pathological survey on Manila clam Ruditapes phijippinarum raised on intertidal bottom and subtidal suspended net cages in Korean waters
Author(s)
이혜미; 강현실; 이희중; 홍현기; 조영관; 김문구; 정지현; 최광식
KIOST Author(s)
Kim, Moonkoo(김문구)Jung, Jee Hyun(정지현)
Publication Year
2016-10-27
Abstract
Previous studies have reported that recent decline in Manila clam landings in Korea is associated with degradation in the environmental qualities and increase in pathogen load, particularly the protozoan parasite Perkinsus olseni. To improve the clam landings, underwater suspended culture has recently been tried. In this study, we compared growth performance and pathology of clams raised using intertidal sowing culture (ISC) and subtidal suspended cage culture (SSCC) on the south coast. From October 2015 to May 2016, the juvenile of 23.1 mm in shell length (SL) were raised using ISC and SSCC and the growth was monitored monthly. After 2 months, increase in the somatic tissue weight in SSCC was approximately twice greater than ISC. Level of infection intensity and prevalence of P. olseni were low in both cultured clams, 3.Ox10^4±10.5x10^4 cells g tissue with the prevalence of 16.7% at IBC and 7.3x10^4±2.6x10^5 cells g tissue with 3.3% prevalence at SSCc. In January, 3 month after the culture, protozoan paramyxean parasite Marteilia sp. were found in the digestive tubules of clams in both culture areas. PCR indicated that the paraiste was Marteilia granuia,and the prevalence ranged from 62.1 to 100 % in SSCC and 16.7-96.7 % in ISC. Cumulated mortality of clams consistently increased from 1.1 % to 85.1 % in the bottom culture throughout the study. In contrast, mortality remained stable as 3.3 % for 5 months ave the clam landings, underwater suspended culture has recently been tried. In this study, we compared growth performance and pathology of clams raised using intertidal sowing culture (ISC) and subtidal suspended cage culture (SSCC) on the south coast. From October 2015 to May 2016, the juvenile of 23.1 mm in shell length (SL) were raised using ISC and SSCC and the growth was monitored monthly. After 2 months, increase in the somatic tissue weight in SSCC was approximately twice greater than ISC. Level of infection intensity and prevalence of P. olseni were low in both cultured clams, 3.Ox10^4±10.5x10^4 cells g tissue with the prevalence of 16.7% at IBC and 7.3x10^4±2.6x10^5 cells g tissue with 3.3% prevalence at SSCc. In January, 3 month after the culture, protozoan paramyxean parasite Marteilia sp. were found in the digestive tubules of clams in both culture areas. PCR indicated that the paraiste was Marteilia granuia,and the prevalence ranged from 62.1 to 100 % in SSCC and 16.7-96.7 % in ISC. Cumulated mortality of clams consistently increased from 1.1 % to 85.1 % in the bottom culture throughout the study. In contrast, mortality remained stable as 3.3 % for 5 months a
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/24426
Bibliographic Citation
2016년도 한국해양학회 추계학술발표대회, pp.292, 2016
Publisher
한국해양학회
Type
Conference
Language
English
Publisher
한국해양학회
Related Researcher
Research Interests

Oil pollution,Antifouling paint,Dissolved methane,유류오염,방오도료,용존메탄

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