Record Details

Eco-biology and fisheries of the whelk, Babylonia spirata (Linnaeus, 1758) and Babylonia zeylanica (Bruguiere, 1789) along Kerala coast, India

CMFRI Repository

View Archive Info
 
 
Field Value
 
Relation http://eprints.cmfri.org.in/10774/
 
Title Eco-biology and fisheries of the
whelk, Babylonia spirata (Linnaeus, 1758) and Babylonia zeylanica (Bruguiere,
1789) along Kerala coast, India
 
Creator Mohan, Anjana
 
Subject Gastropods
Theses
 
Description The two species of whelks, B. spirata and B. zeylanica were never found to coexist.
The hydrographic parameters like temperature, salinity, ammonia, nitrite and
nitrate of surface and bottom water were similar between the sites of the two whelk beds.
pH, dissolved oxygen, phosphate and total suspended solids of surface and bottom water
showed significant variations among zones. Total organic carbon of sediment was
analysed for all the stations and significant variations were observed between S; and S2
and N2 and S; Significant variation in sediment texture between B. spirata and B.
zeylanica beds was observed. The sediment texture in the B. spirata bed was silt-loam at
all stations, while in the B. zeylanica bed, it was sand-loam at S; (10-20 m) and sandy at
S; (20-30 m). In the north zone, Babylonia spirata was present at both the sites N; and
N2 and in the southern zone at S; at a low density and was absent in S; B. zeylanica was
observed only at site S2 (2 no/l0m2). The density of B. spirata varied among sites and
maximum density was observed at N2 (6 no/l0m2) and minimum at S1 (0.04 no/l0m2).
The density of B. zeylanica was low compared to the density of B. spirata at the same
depth in the north zones. Length composition of B. spirata population in the two zones
was similar, dominated by adult whelks. Females dominated the population in north zone,
while males dominated the population at S1_ B. zeylanica inhabited only the deeper
regions of south zone and the population was dominated by adult whelks and females out
numbered males. B. spirata abundance was high in areas with more silt and TOC, and
showed negative relationship with sand composition. B. zeylanica density increased with
sand and significant negative relationship observed with clay, silt and TOC.
 
Date 2007
 
Type Thesis
NonPeerReviewed
 
Format text
 
Language en
 
Identifier http://eprints.cmfri.org.in/10774/1/Eco-biology_fisheries_whelk%2C%20Babylonia%20spirata_%20Babylonia%20zeylanica_%20along%20Kerala%20coast%2C%20India_Anjana%20Mohan_2007.pdf
Mohan, Anjana (2007) Eco-biology and fisheries of the whelk, Babylonia spirata (Linnaeus, 1758) and Babylonia zeylanica (Bruguiere, 1789) along Kerala coast, India. Doctoral thesis, Central Marine Fisheries Research Institute.