Monitoring of the mortalities and medications in the inland farms of olive flounder, Paralichthys olivaceus, in South Korea

Abstract

The monitoring was performed to survey the mortalities and medications occurred in the inland aquaculture farms of olive flounder in South Korea from May to October, 2012. Both of the indirect inquiry for entire inland farms and the sample survey for selected farms were carried out. The aquatic organism disease inspectors, who have the national licenses for the diagnosis and prevention of aquatic organism diseases and have close relationship with the farms, investigated the rates and causes of mortalities according to the standard manual. The cumulative mortalities rate by the indirect inquiry on 565 farms, was calculated to 27.18%, and the mortalities rate by infectious diseases was 22.64%. Otherwise, the mortalities rate by sample survey on 60 farms was 25.50%, 19.33% of them were caused by infectious diseases. The high mortality rates were recorded by scuticociliatosis, non-infectious loss, streptococcosis, VHS, artificial eliminations, vibriosis and gliding bacterial disease. Streptococcosis and non-infectious mortality caused to serious loss in productivity and economy of the farms, because of their outbreaks in the flounder groups over 600 g. The monitoring of medications in the selected farms revealed that formalin for the treatment of external parasites, such as scuticociliates, was the most commonly used drugs in the farms. As the antibiotic medications, amoxicillin and florfenicol for streptococcosis, and oxytetracycline and neomycin expecting wide antibacterial spectrum, were frequently prescribed.

Identification of Vibrio species isolated from cultured olive flounder (Paralichthys olivaceus) in Jeju Island, South Korea

“…Previous studies have reported that olive flounder mortality caused by bacterial disease was 6.75%. In 6.75% cases of infection, vibriosis-related mortality was reported in 24.2% (Jee et al 2014). In olive flounder, Vibrio spp.…”

The efficacy of amoxicillin sodium against streptococcosis in cultured olive flounder Paralichthys olivaceus and its pharmacokinetics

“…Aquaculture production has increased from 1037 MT in 1990–43 413 MT in 2014 in Korea (Korean Statistical Information Service, KOSIS, http://kosis.kr). However, infectious bacterial diseases—including streptococcosis (12.7%), vibriosis (6.7%), and edwardsiellosis (2.0%)—are major problems for olive flounder aquaculture in Korea (Jee et al ., ).…”

Application of tylosin antibiotics to olive flounder (Paralichthys olivaceus) infected with Streptococcus parauberis

“…In 2011, 13.57% of the total mortality of olive flounder was found to be caused by streptococcal infection in 70 olive flounder farms in South Korea (Kim et al 2012). From May to October 2012, 12.8% of the mortality in the whole Korean inland olive flounder aquafarm was caused by streptococcal infection (Jee et al 2014). In addition, by analyzing the causes of mortality in olive flounder aquafarms in Jeonnam and Jeju, the rates of mortality caused by streptococcal infection were 9.76% in 2015, 7% in 2016, and 2% in 2017 (Shim et al 2019).…”