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℃ and 19.5℃) and three different admission densities(50, 100, 200 thound individuals/ton) with two replication each. The fish was transferred from hatch...
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℃ and 19.5℃) and three different admission densities(50, 100, 200 thound individuals/ton) with two replication each. The fish was transferred from hatchery at Gohung to Aquaculture Research Centre, Yosu National University by 2 hours.
To observe the changes of water quality before and after transportation, environmental change(pH, DO, and Suspended Soilds) and nutrient change(nitrite, nitrate, ammonia, and phosphate) 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. puntatus, 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.
Further researches on biochemical changes in different environmental factors and new transportation techniques are required as future work to maximize the survival rate during transportation of K. puntatus.
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℃ and 19.5℃) and three different admission densities(50, 100, 200 thound individuals/ton) with two replication each. The fish was transferred from hatchery at Gohung to Aquaculture Research Centre, Yosu National University by 2 hours.
To observe the changes of water quality before and after transportation, environmental change(pH, DO, and Suspended Soilds) and nutrient change(nitrite, nitrate, ammonia, and phosphate) 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. puntatus, 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.
Further researches on biochemical changes in different environmental factors and new transportation techniques are required as future work to maximize the survival rate during transportation of K. puntatus.
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