scholarly journals Fishery and biological traits of obtuse barracuda Sphyraena obtusata (Cuvier, 1829) off south-west coast of India

2021 ◽  
Vol 42 (1) ◽  
pp. 112-117
Author(s):  
K.M. Rajesh ◽  
◽  
P. Rohit ◽  
E.M. Abdussamad ◽  
◽  
...  
Keyword(s):  
West Coast ◽  
Gonadosomatic Index ◽  
Management Strategies ◽  
Reproductive Traits ◽  
Biological Traits ◽  
West Coast Of India ◽  
South West ◽  
South West Coast ◽  
First Maturity ◽  
Spawning Periods

Aim: The present study was conducted to investigate the fishery, diet composition and reproductive aspects of obtuse barracuda landed in Karnataka, south-west coast of India. Methodology: Feeding and reproductive traits of 1229 samples (638 males and 591 females) of S. obtusata was studied for a period of five years. The index of relative importance (IRI) was determined for each diet component in the stomach. Reproductive aspects such as maturity stages, gonadosomatic index and fecundity were investigated. Results: The most predominant prey item in terms of frequency of occurrence (93.1%), number (91.4%), weight (93.2%), IRI (3615.5) and also % IRI (98.5%) was fishes. Crustaceans and cephalopods were noticed less frequently and were represented by shrimps and Loligo sp. The estimated length at first maturity for male and female fishes was 20.5 and 21.3 cm, respectively. Higher GSI values were observed during post monsoon (October-November) followed by summer pre monsoon (April-May) season in both males and females, indicating two peak spawning periods. Interpretation: The comprehensive study on major biological characteristics of Sphyraena obtusata could be useful for developing appropriate management strategies for conservation and judicious exploitation of this commercially important resource. Key words: Barracuda, Fecundity, Gonadosomatic index, Sphyraena obtusata

scholarly journals Reproductive biology of the commercially important Indian squid Uroteuthis (Photololigo) duvaucelii (d’ Orbigny [in Ferussac & d’ Orbigny], 1835) off Mangalore, south-west coast of India

2017 ◽  
Vol 64 (1) ◽  
pp. 75
Author(s):  
N. Rajendra Naik ◽  
S. M. Shivaprakash ◽  
H. N. Anjaneyappa ◽  
S. R. Somasekhara ◽  
Jaya Naik ◽  
...  
Keyword(s):  
West Coast ◽  
Female Ratio ◽  
West Coast Of India ◽  
Size Dependent ◽  
South West ◽  
Significant Difference ◽  
South West Coast ◽  
Commercially Important ◽  
First Maturity ◽  
Male To Female

Uroteuthis (Photololigo) duvaucelii is one of the commercially important inshore squid resources off the south-west coast of India. Length-weight relationship for this species indicated no significant difference between the sexes and hence, the relationship for both the sexes was represented with the common equation W = 0.4624 L2.1158. U. (P.) duvaucelii spawned throughout the year with peak spawning in May. Absolute fecundity ranged from 1,545 to 13,585 eggs with an average of 7,554 eggs. Size at first maturity indicated that females matured earlier at 70 mm DML (dorsal mantle length) whereas males matured little later at 90 mm DML. Males were observed to be dominant during most of the study period with overall male to female ratio of 1:0.93. Seasonal and size dependent variations in sex ratio were distinct.

scholarly journals Seriolina nigrofasciata (Ruppel, 1829), its fishery and biological aspects off south-west coast of India

2019 ◽  
Vol 66 (1) ◽  
Author(s):  
K.M. Rajesh ◽  
Prathibha Rohit ◽  
K.G. Mini ◽  
T. Sathyavathi ◽  
M.M. Abdul Hakeem
Keyword(s):  
West Coast ◽  
Tamil Nadu ◽  
Monsoon Season ◽  
Spawning Period ◽  
West Coast Of India ◽  
Weight Relationship ◽  
Fishing Vessels ◽  
South West ◽  
South West Coast ◽  
First Maturity

A comprehensive study on fishery, length-weight relationship, trophodynamics and reproductive aspects of the blackbanded trevally Seriolina nigrofasciata (Ruppel, 1829), collected during January 2013 to December 2017 from fishing vessels operating along eastern Arabian Sea off south-west coast of India was conducted. Among the maritime states of the country, Karnataka was the major contributor (53.9%) followed by Kerala (24.1%), Maharashtra (16%) and Tamil Nadu (4.3%). In Karnataka, 99.5% of the blackbanded trevally catch was exploited by trawl net and rest by outboard gillnets (0.5%). The total length ranged from 16.3 to 57.5 cm with fishes in the size range of 24 to 36 cm forming 80.8% of the catch. The length-weight relationship estimated showed a negative allometric growth for both sexes with b values of 2.595 for females and 2.504 for males. The estimated ‘a’ values for females and males were 0.00013 and 0.00021 respectively. In all, fifteen prey items under three major groups (teleosts, cephalopods and crustaceans) comprised the diet, with teleosts (73.23%) being the predominant food item followed by cephalopods (26.53%) and crustaceans (0.24%) in terms of index of relative importance (IRI). Overall sex ratio (male: female) of 1:1.15 indicated a slight dominance of females over males. The length at first maturity was estimated at 25.0 cm for male and 27.0 cm for female. The availability of mature and spent specimens all through the year implied that the species has prolonged spawning period with a peak during the summer season (March-May) and a minor secondary peak in post-monsoon season (October to December).

Meteorological aspects of mud bank formation along south west coast of India

2013 ◽  
Vol 65 ◽  
pp. 45-51 ◽  
Author(s):  
Asha S. Philip ◽  
C.A. Babu ◽  
P.V. Hareeshkumar
Keyword(s):  
West Coast ◽  
West Coast Of India ◽  
South West ◽  
South West Coast ◽  
Mud Bank

Length-weight relationships of three fish species from Kerala waters, south-west coast of India

2017 ◽  
Vol 33 (6) ◽  
pp. 1308-1309 ◽  
Author(s):  
S. K. Roul ◽  
A. R. Akhil ◽  
T. B. Retheesh ◽  
D. Prakasan ◽  
U. Ganga ◽  
...  
Keyword(s):  
Fish Species ◽  
West Coast ◽  
West Coast Of India ◽  
South West ◽  
South West Coast

222Rn CONCENTRATION IN GROUND WATERS OF COASTAL KARNATAKA AND KAIGA OF SOUTH WEST COAST OF INDIA

2001 ◽  
Vol 81 (6) ◽  
pp. 724-728 ◽  
Author(s):  
H. M. Mahesh ◽  
D. N. Avadhani ◽  
N. Karunakara ◽  
H. M. Somashekarappa ◽  
Y. Narayana ◽  
...  
Keyword(s):  
West Coast ◽  
West Coast Of India ◽  
222Rn Concentration ◽  
Ground Waters ◽  
South West ◽  
South West Coast

Sexual Maturity, Spawning Periodicity and Fecundity of Obtuse Barracuda Sphyraena obtusata (Cuvier, 1829) along Karnataka Coast, Southeastern Arabian Sea

2021 ◽  
Author(s):  
M.M. Meshram ◽  
Mridula Rajesh ◽  
K.M. Rajesh ◽  
N.K. Suyan
Keyword(s):  
Gonadosomatic Index ◽  
Management Strategies ◽  
Gravimetric Method ◽  
Reproductive Traits ◽  
Breeding Period ◽  
Southeastern Arabian Sea ◽  
Spawning Periodicity ◽  
Gravid Females ◽  
First Maturity ◽  
Management And Conservation

Background: The success or failure of spawning in any population affects the fishery. Hence, studies on spawning, maturation, fecundity and length at first maturity become essential in drafting management strategies. The detailed information on reproductive traits of Sphyraena obtusata will be helpful in sustainable management and conservation in the study area. Methods: Three hundred and fifty five specimens of S. obtusata were collected fortnightly from Mangaluru and Malpe fishing harbors during August 2019 to March 2020. Maturity of gonads was examined by macroscopic and histological investigations. Spawning periodicity was worked out based on maturity stages and seasonal gonadosomatic index. Gravimetric method of analysis was employed to evaluate the fecundity from randomly collected samples of gravid females. Result: Overall sex ratio revealed that the population had significantly higher (p less than 0.05, X2 test) proportion of females than males. The length at 50% maturity (Lm50) for females and males was estimated at 21.1 and 21.5 cm respectively. The gonadosomatic index (GSI) and the availability of matured individuals for both the sexes in various percentage indicated a prolonged breeding period from October to March with peaks in November and December. The absolute fecundity varied from 91,942 eggs (20.0 cm TL) to 1,34,445 eggs (27.0 cm TL) with an average of 1,12,878 ± 2,984 hydrated oocytes per female.

Shoreline Evolution along a Placer Mining Beach of South-West Coast of India

2020 ◽  
Vol 89 (sp1) ◽  
pp. 150
Author(s):  
Ravindran Prasad ◽  
Leela Sheela Nair ◽  
Njaliplackil Philipose Kurian ◽  
Thirumali Nageshrao Prakash
Keyword(s):  
West Coast ◽  
West Coast Of India ◽  
Shoreline Evolution ◽  
South West ◽  
South West Coast
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