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순환여과시스템에서 염분농도가 전복, Haliotis discus hannai에 미치는 영향
한지도,박혼,김다운,김승철,전미애,김수철,이덕찬 한국패류학회 2023 The Korean Journal of Malacology Vol.39 No.1
When abalones were farmed in a Recirculating Aquaculture System (RAS) with inadequate water conditioning for a long time, the salt concentration gradually increased to more than 36 psu. This study raised abalones in different salt concentrations (30, 33, 36, and 39 psu) in a RAS and examined growth (shell and weight), cumulative mortality, changes in blood components, and histological changes to explore the effect of salt concentration on these parameters. During the two-week experiment, the daily growth rate decreased and the cumulative mortality increased as the salt concentration in the water increased. Concentrations of K+, Na+, and Cl- ions in the hemolymph changed significantly, and the cell mortality of blood cells increased. In addition, histopathological alterations in gill and digestive tubule of the abalone showed more obvious with experimental condition of salinity increase. Based on the results, a salinity of 36 psu or higher is not a suitable environment for the survival of abalones.
이덕찬,한지도,김근용,전미애,김다운,박혼,김병학 한국패류학회 2021 The Korean Journal of Malacology Vol.37 No.3
The mitochondrial genome (mitogenome) of the invasive and harmful polychaete species, Polydora hoplura (Annelida), was analyzed by next generation sequencing (NGS). Its mitogenome was found to be 17,597 bp in length, comprising 13 protein-coding genes, two ribosomal RNA genes, and 23 transfer RNA genes, with one additional trnM gene. The gene composition and order of P. hoplura were distinct from those of polychaetes and even differed from those of Marenzelleria neglecta belonging to the same family, Spionidae.
Growth of abalone (Haliotis discus hannai) in cages using epibiont control measures
한지도,전미애,Da Woon Kim,박혼,김병학,이덕찬 한국수산과학회 2021 Fisheries and Aquatic Sciences Vol.24 No.12
In this study, the relationship between the growth of abalone and the presence of epibionts was investigated in abalone cultured in Goheung, Jeollanam-do, where there are severe problems high water temperatures and attachment. The experiment was conducted for eight months (May–December 2020), and 40 abalone were collected every month. Water temperature was at its highest at a range of 13.5℃–26.6℃ and dissolved oxygen levels were at their lowest at a range of 4.0–10.2 μg/L in August. The shell height (mm) of abalone grew to 117.7% (81.8 ± 1.9 mm) in cultures where epibionts were removed (ER) and 111% (77.4 ± 3.3 mm) where they were not (non-epibionts, NER). Their total weight (TW) and body weight increased significantly and steadily with ER, whereas the TW increased sharply after August with NER. In the condition index, no significant difference was observed between ER and NER. The monthly proportion of epibionts increased significantly in July, accounting for the value of 69.9% reached in December.