luminescence of death shrimps

Daudin · Post by **Daudin** » Sat Dec 09, 2006 2:34 am

I bought 30 bee shrimps yesterday. Three animals died during adaptation to new contidions at night. I was very surprised, the death animals luminesced! Do anybody oberve the same thing?

Gregor Samsa Mendel · Sat Dec 09, 2006 10:04 am

Luminescence Disease

Early Macrobrachium larval stages are susceptible to vibriosis caused by Vibrio harveyi. This disease is very common in hatcheries of both freshwater and marine shrimps. The unique clinical sign of this disease is the luminescence of infected larvae which can be observed at night. Infected larvae also show fouling, opacity, swim slowly, aggregration and they ultimately die. Mortalities may reach 100%. In Thailand, luminescent bacteria are often observed in the sea or salt water farms. When this appears, there is almost complete failure of postlarval production at the hatchery. Treating the salt water with chlorine or formalin before use does not seem to be effective during such an incident. Sae-oui et al. (1987) tested antibiotic sensitivity of V. harveyi found in P. merguiensis and reported that the bacterium was sensitive to chloramphenicol and novobiocin but resistant to streptromycin. They also found that the bacteria were completely killed by treating with Ca(HOCl)2 at 20-30 ppm or formalin at 50 ppm.

Source:
http://www.fisheries.go.th/aahri/Health ... r/art6.htm

bulrush · Post by **bulrush** » Thu Dec 14, 2006 11:55 am

Wow! Did they luminesce by themselves or under UV light?

Neonshrimp · Post by **Neonshrimp** » Fri Dec 15, 2006 8:40 pm

It was by themselves due to the bacteria they were infected with.

Daudin · Post by **Daudin** » Sun Dec 17, 2006 1:23 am

bulrush wrote:Wow! Did they luminesce by themselves or under UV light?

They luminsced by themselves. Next two days another seven shrimps died, but I didn´t observe the same phenomenon.

Daudin · Post by **Daudin** » Sun Dec 17, 2006 1:26 am

Neonshrimp wrote:It was by themselves due to the bacteria they were infected with.

Can you write me literature source where is description of this phenomenon? Thanks.

Neonshrimp · Post by **Neonshrimp** » Sun Dec 17, 2006 1:32 am

Gregor Samsa Mendel gave us as source above which has reference to "Luminescence Disease". You can search more on this disease if still interested.

Source:
http://www.fisheries.go.th/aahri/Health ... r/art6.htm

Daudin · Post by **Daudin** » Sun Dec 17, 2006 3:53 am

Gregor Samsa Mendel reference is clear. I thought you know another reference concerned by adults nad genus Caridina/Neocaridina.