Bath efficacy of sodium hypochlorite, oxytetracycline dihydrate and chloramphenicol against bacterial black disease in fairy shrimpBranchinella thailandensis

Abstract

To control black disease infecting fairy shrimp Branchinella thailandensis, the effects of concentrations and exposure time to three effective antimicrobials, which inhibited the pathogens in vitro, were evaluated. Exposure to sodium hypochlorite (NaOCl) caused a great toxicological response in the shrimp, 100% mortality was observed within 30 min-2 h at 5-20 lg mL À1 . For oxytetracycline dihydrate (OTC) and chloramphenicol (CP), shortterm exposure to four high concentrations up to 5 h and long-term exposure (12 days) to four low concentrations were used to determine an appropriate method for bath efficacy. Long-term exposure to low concentrations was more toxic than the short-term. Short-term exposure to OTC showed the highest survival rate and CP was considered more toxic. The minimum survival rate of the shrimp exposed to both antibiotics at 250 lg mL À1 for 3 h was 83.3%. For determination of the bath efficacy, a short-term exposure (3 h) to OTC and CP was conducted using artificially infected shrimp. Administration of OTC and CP at 250 and 500 lg mL À1 resulted in the highest survival rates of 56.7% and 46.7% respectively. This study demonstrated that bath administration with OTC could be an alternative method for the treatment of black disease in fairy shrimp cultivation.

Optimal egg viability storage conditions in two commercial fairy shrimps (Crustacea: Branchiopoda: Anostraca) from Thailand

“…Currently, fairy shrimp have received much attention as food for culturing fishes and shrimps (Dumont & Munuswamy ; Namin, Arshad & Ramezanpoor ; Sriputhorn & Sanoamuang , ; Velu & Munuswamy ; Plodsomboon, Maeda‐Martinez, Obregon‐Barboza & Sanoamuang ; Sornsupharp, Dahms & Sanoamuang ; Saejung, Hatai & Sanoamuang ,b; Sornsupharp, Lomthaisong, Dahms & Sanoamuang ). In Thailand, three fairy shrimps species ( Streptocephalus sirindhornae Sanoamuang et al .…”

Effects of dried fairy shrimpStreptocephalus sirindhornaemeal on pigmentation and carotenoid deposition in flowerhorn cichlid;Amphilophus citrinellus(Günther, 1864) × Cichlasoma trimaculatum(Günther, 1867)

“…This diet was also given to rainbow trout ( Salmo gairdneri ) and it provided a reddish pigmentation to the skin and muscle (Choubert & Luquet ). Even though two species of fairy shrimp ( Streptocephalus sirindhornae and Branchinella thailandensis ) have been commercially harvested as food for ornamental fish and freshwater shrimp in Thailand since 2004 (Sriputhorn & Sanoamuang ; Saejung, Hatai & Sanoamuang ), no fairy shrimp meal is available in the market yet. However, the use of fairy shrimp meal in aquaculture is expected to be implemented in the future.…”