Record Details

Fishery and Biology of deep-sea chondrichthyans off the Southwest coast of India

CMFRI Repository

View Archive Info
 
 
Field Value
 
Relation http://eprints.cmfri.org.in/10485/
 
Title Fishery and Biology of deep-sea chondrichthyans off the Southwest coast of India
 
Creator Akhilesh, K V
 
Subject Theses
Fishery biology
 
Description Class Chondrichthyes is one of the oldest groups of vertebrates, which
survived for more than 400 million years since Devonian period, and the second
largest class of fishes after Osteichthyes. Chondrichthyes can be differentiated from
Osteichthyes (bony fishes) based on the presence of placoid scales, which has been
replaced by scales in fishes and possessing simple internal skeletons formed of
calcified cartilage and no true bones (Last and Stevens, 2009). The body forms
of Chondrichthyes shares many similar characteristics, but is highly varied between
orders, reflecting adaptations to lifestyle, habitat and environment (Compagno, 1999).
Class Chondrichthyes is a monophyletic group and is divided into two subclasses, the
Holocephali (holo=whole, cephalic =head) containing Chimaeras and the
Elasmobranchii (elasmo =plate, branchii =gills) containing sharks, skates and rays.
Elasmobranchii can be differentiated from chimaeras in having multiple paired gill
openings (5-7), where as the latter have only single gill opening (Fowler et al., 2005).
 
Date 2014
 
Type Thesis
NonPeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/10485/1/Akhilesh_Thesis.pdf
Akhilesh, K V (2014) Fishery and Biology of deep-sea chondrichthyans off the Southwest coast of India. ["eprint_fieldopt_thesis_type_phd" not defined] thesis, Central Marine Fisheries Research Institute.