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Investigation on the mortality of juveniles in captive stock of the Indian halibut Psettodes erumei

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Title Investigation on the mortality of juveniles in captive stock of the Indian halibut Psettodes erumei
 
Creator Kizhakudan, Joe K.
Praveena, P. Ezhil
Maran, B.A. Venmathi
Otta, S.K.
Bhuvaneswari, T.
Rajan, J.J.S.
Krishnamoorthi, S.
Jithendran, K.P.
 
Subject Indian halibut
Psettodes erumei
Copepods
Protochondracanthus alatus
Trilobatus
Amyloodinium sp.
Pathogenic infection
Mortality
Treatment
 
Description 1217-1223
A study was undertaken to investigate the cause of mortality in the captive stock of Indian halibut, Psettodes erumei (Bloch & Schneider, 1801) (Psettodidae). Halibuts were severely infected with two species of parasitic copepods, Protochondracanthus alatus (Heller, 1868) and P. trilobatus (Pillai, 1964) (Poecilostomatoida, Chondracanthidae) and also with protozoan Amyloodinium sp. (Blastodinida, Oodiniaceae) on gills. Since the parasitic copepods have high host specificity on P. erumei, a large number of copepods were collected. Gill lamellae appeared pale and excess mucous secretion was observed on the body surface. Histopathological changes were mainly in the gill tissues with severe lamellar hypertrophy and hyperplasia, lamellar fusions with the presence of trophonts of Amyloodinium sp. Wild caught tilapia, and juveniles of mullet and milkfish used as live feed were suspected to be the cause of transmission to the rearing system. Infected fishes showed loss of appetite, irregular swimming, restlessness, exhaustion and gaping at the surface. Samples tested were negative for betanodavirus and systemic bacterial infection. Management intervention and multiple treatment of rearing facility using formalin @ 200 ppm controlled the infection, and half of the stock could escape from mortality.
 
Date 2016-07-21T06:16:44Z
2016-07-21T06:16:44Z
2015-08
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://nopr.niscair.res.in/jspui/handle/123456789/34895
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.44(08) [August 2015]