전어, Konosirus punctatus 치어의 적정 활어수송조건(수온, 밀도) = Optimal condition (Water Temperature and Fish Density) for Transportation of Gizzard Shad (Konosirus punctatus) Juvenile

다국어 초록 (Multilingual Abstract)

Gizzard shad, Konosirus punctatus, juvenile (body size 2.7±0.41㎝, body weight 0.13±0.03g)
was used in this study, in two different temperatures (14.5℃, Low Temperature and 19.5℃,
High Temperature) and three different admission densities (50, 100, 200 thound individuals/
ton) with two replication each. To observe the changes of water quality before
and after transportation, environmental change pH, DO, Suspended Soilds (SS) and nutrient
change (NO2-N, NO3-N, NH4-N, PO4-P, SiO2) were investigated, and observed the mortality
of K. puntatus juvenile, as the standard to compare the variables, the changes of water quality
factors were analysed in comparison. All the water quality factors showed as regular relationship
in the group with different water temperature and admission density. In the environmental
factors, both pH and DO was on negative relation and suspended soilds was on
positive relation with water temperature and admission density. In the case of nutrients,
NH4-N and PO4-P was on positive and NO3-N showed negative relation. NO2-N showed
the highest and the lowest value in midium and low admission density, respectively, and
there was no significance with water temperature. SiO2 showed increasing tendency with
water temperature and admission density to some extent in after transportation in comparison
to before transportation. Mortality rate after transportation was of higher trend in high
water temperature and high admission density. Economic performance of individual juvenile
showed as the lowest in medium admission density and low water temperature. Thus, in
transportation of juvenile Gizzard shad, K. punctatus, low water temperature than high is
considered to be suitable in changes of water quality, nutrients, survival rate, and suspended
soilds, and in economic performance for admission density, 100 thound individuals per ton
of water for transportation is esteemed as the best.