한국 서해안 백합 Meretrix lusoria의 생물학적 활성요인의 계절성 (Seasonality of the Biological Activity Factors of the hard clam Meretrixlusoria in the Western Coast of Korea)

서지정보

· 발행기관 : 한국양식학회
· 수록지 정보 : 한국양식학회지 / 21권 / 2호 / 111 ~ 122페이지
· 저자명 : 송재희, 김치홍, 박성우, 유진하, 조영조

초록

This study was conducted to assess the usefulness of the temperature characteristics of the tidal flat sediments
during low tide as a environmental factor, and burrowing behaviour, fatness, total hemocyte counts(THCs) and differential
hemocyte counts (DHCs) of hard clamMeretrix lusoria as biological activity indices for the management
of hard clam farms located in Taean (Chungnam province) and Gimje (Jeonbuk province) tidal flat in Korea. Temperature
ranges of the sediment at 1cm depth during spring(March to May) and summer(June to August) in Taean
(where the exposure time was about 5.5~6 hours during low tide) were 8.7~26.8oC and 27.6~32.8oC, respectively.
Even though there was no significant difference (P>0.05), temperatures of the surface sediment where submerged
with remained seawater were generally higher than that of uncovered with seawater. Burrowing depths of normally
digged hard clams were 0.9~3.6cm from March to October, 2002. In the field experiment performed at Taean farming
ground covered with seawater, burrowing times of the clams under natural water temperatures were
41.6±10minutes in February and 5.4±1.3minutes in August, respectively, and these were influenced by water temperatures.
Fatness of hard clams began to decrease from May (at Taean tidal flat) and June (at Gimje tidal flat),
showed the lowest level in August and increased again from September. Total hemocytes counts in the hemolymph
of the hard clams were decreased to the lowest level in July (24.7×104cells/mL, at Taean tidal flat) and August
(28.2×104cells/mL, at Gimje tidal flat), and significantly increased again from September (at Taean tidal flat,
P<0.01) and October (at Gimje tidal flat, P<0.001), respectively. We observed three types of hemocytes from the
hemolymph of hard clams according to whether hemocytes retain the granules or not and the size of the granules.
As a results, we could found that periodical monitoring of the sediment temperatures, clam burrowing behaviour
and hemocyte parameters were very helpful for the management of hard clam farming.

영어초록

This study was conducted to assess the usefulness of the temperature characteristics of the tidal flat sediments
during low tide as a environmental factor, and burrowing behaviour, fatness, total hemocyte counts(THCs) and differential
hemocyte counts (DHCs) of hard clamMeretrix lusoria as biological activity indices for the management
of hard clam farms located in Taean (Chungnam province) and Gimje (Jeonbuk province) tidal flat in Korea. Temperature
ranges of the sediment at 1cm depth during spring(March to May) and summer(June to August) in Taean
(where the exposure time was about 5.5~6 hours during low tide) were 8.7~26.8oC and 27.6~32.8oC, respectively.
Even though there was no significant difference (P>0.05), temperatures of the surface sediment where submerged
with remained seawater were generally higher than that of uncovered with seawater. Burrowing depths of normally
digged hard clams were 0.9~3.6cm from March to October, 2002. In the field experiment performed at Taean farming
ground covered with seawater, burrowing times of the clams under natural water temperatures were
41.6±10minutes in February and 5.4±1.3minutes in August, respectively, and these were influenced by water temperatures.
Fatness of hard clams began to decrease from May (at Taean tidal flat) and June (at Gimje tidal flat),
showed the lowest level in August and increased again from September. Total hemocytes counts in the hemolymph
of the hard clams were decreased to the lowest level in July (24.7×104cells/mL, at Taean tidal flat) and August
(28.2×104cells/mL, at Gimje tidal flat), and significantly increased again from September (at Taean tidal flat,
P<0.01) and October (at Gimje tidal flat, P<0.001), respectively. We observed three types of hemocytes from the
hemolymph of hard clams according to whether hemocytes retain the granules or not and the size of the granules.
As a results, we could found that periodical monitoring of the sediment temperatures, clam burrowing behaviour
and hemocyte parameters were very helpful for the management of hard clam farming.

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