PINK PATCHES IN LARVAL TANKS

From: bondada srinivassa rao bondadasrinivasarao@yahoo.co.in
To: shrimp@yahoogroups.com
Sent: 29 October 2001

QUESTION:

I have noticed pick colour patches in larval tank walls of P. indicus fry.  Can any one tell us what are these?

I am operating my hatchery for last 5 runs. We don’t use antibiotics or probiotics. We think it is time to shut down the facility for disinfection. We noticed these patches in our new fibre glass tanks and subsequently the moulting failed from zoea to mysis and from mysis to PL.

Bondada Srinivassa Rao 
e-mail: bondadasrinivasarao@yahoo.co.in

***************

COMMENTS 1 :

I have seen these patches in P. monodon in the Philippines, Malaysia and Bali. And L. vannamei larvae tanks in Belize.  In my experience it caused no problems as many tanks with this had good production. But what is it?  I'm not sure.  I always presumed it was some type of bacteria. It came and went on its own.

Hank Bauman
e-mail: belizeaqua@bti.net

***************

COMMENTS 2 :

That could be Pseudomonas contamination. This is a common problem in larviculture tanks in Ecuador.

The first you have to do is take samples and swab in some specific media culture (like Pseudomonas Agar or Cetrimide Agar), then you can detect some characteristic strong odor from bacterial growth.
Finally you must confirm doing some biochemical identification or API analysis.

Ac. Gabriel Rivera L.
Director de Investigación y Desarrollo - FARMAVET
Alborada Etapa 11, Mz. 44, Villa 10, Av. Benjamín Carrión y Av. Isidro Ayora, Guayaquil-Ecuador
Telf. 593-4-2241510/2239575/2239719/2239734/2238798/2279808
Fax 593-4-2243936
Celular 593-9-9989311
Fax personal 1-435-508-3414 (USA)

e-mail: griveralo@yahoo.com

home