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Investigations on the incidence of cystic calculus in female cobia Rachycentron canadum (Linnaeus, 1766) broodfish leading to spawning failure and mortality

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Relation http://eprints.cmfri.org.in/10611/
 
Title Investigations on the incidence of cystic calculus in female cobia
Rachycentron canadum (Linnaeus, 1766) broodfish leading
to spawning failure and mortality
 
Creator Samal, Amir Kumar
Nazar, A K A
Jayakumar, R
Tamilmani, G
Sakthivel, M
Ramesh Kumar, P
Gopakumar, G
 
Subject Mussel culture
Fish Biotechnology
 
Description The morphological, chemical and high resolution electron microscopic analysis of a cystic calculus (urinary bladder stone)
from a ready-to-spawn female broodfish of cobia Rachycentron canadum (Linnaeus, 1766) is reported. The stone was
elliptical in shape with 31 mm dia having chalky, amorphous and fragile consistency with several concentric major
layers covering the core. Chemically the stone was uniform in composition with 52.63% calcium oxalate monohydrate
(COM), 31.58 % uric acid and 15.70% hydroxyapatite (HAP). However, the peripheral layer differed significantly from
the middle and the core in elemental composition. Ultrastucturally, each of the individual layers were made of multiple fine
sub-layers. Additionally, all the layers/portions of the stone displayed a hard, coral-like structure entrapping spherical sacs
and contained isolated and fused spherules inside and outside the sacs. However, hexagonal forms of COM crystals were
unique to the peripheral layers. While the obstruction of the oviduct due to the large sized stone was probably the cause of
spawning failure. Continuous but futile contraction of the musculature during the unsuccessful spawning effort might have
caused energy exhaustion and ultimate death of the animal.
 
Date 2015
 
Type Article
PeerReviewed
 
Format text
 
Language en
 
Identifier http://eprints.cmfri.org.in/10611/1/IJF_62.4_Amir%20Kumar%20Samal_10.pdf
Samal, Amir Kumar and Nazar, A K A and Jayakumar, R and Tamilmani, G and Sakthivel, M and Ramesh Kumar, P and Gopakumar, G (2015) Investigations on the incidence of cystic calculus in female cobia Rachycentron canadum (Linnaeus, 1766) broodfish leading to spawning failure and mortality. Indian Journal of Fisheries, 62 (4). pp. 144-148.