Published by: NISCAIR (CSIR)
Subjects: Earth Science
This journal was started in 1972 and this multi-disciplinary journal publishes full papers and short communications in the following areas: marine biology, marine chemistry, marine geology, physical oceanography, ocean engineering, marine instrumentation, marine corrosion and material science, satellite oceanography & modeling, marine engineering, marine pollution, marine archaeology, coastal zone management.
Editor, IJGMS, National Institute of Science Communication And Information Resources, CSIR, K S Krishnan Marg, Pusa Campus,
New Delhi 110 012, India
Phone:25846301,03-07 (Extn-248); Fax:(91)(11) 25847062 E-mail: firstname.lastname@example.org
ISSN No. : 0379-5136
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Effect of stocking density on the hatching rate, larval and early juvenile rearing of edible sea cucumber Holothuria scabra (Jaeger, 1883)
Title: Effect of stocking density on the hatching rate, larval and early juvenile rearing of edible sea cucumber Holothuria scabra (Jaeger, 1883)
Authors: Asha, P.S.; Diwakar, K.
Abstract: Fertilized eggs, auricularia larvae and three
month old juveniles of H. scabra,
obtained from induced spawning were used for various experiments to assess the
effect of stocking density on hatching rate, larval and early juvenile rearing
of commercially important sea cucumber H.
scabra. Experiments were conducted for two days on hatching rate of
fertilized eggs, for ten days on larval survival, growth and development and
for 120 days on juvenile’s growth rate. An inverse relationship was observed
between stocking density and hatching rate. Hatching rate varied between 15.1%
at 8 eggs mL-1 to a maximum of 66.4% at 0.5 eggs mL-1.
High survival, growth rate and fastest development of auricularia at stocking
density 1 larvae mL-1 indicated the optimum larval rearing
conditions. Maximum growth rate in length and weight, suggested the stocking
density 4.2 Nos. m-2 is good for juvenile rearing. One way ANOVA on
the differences in the hatching rate, larval growth and survival rate, juvenile
growth rate both in length as well as in weight at different stocking densities
indicated high level of significances (P<0.001).
Comparative length-weight relationship of two species of catfishes, Arius caelatus (Valenciennes, 1840) and Arius tenuispinis (Day, 1877) from Mumbai waters+
Title: Comparative length-weight relationship of two species of catfishes, Arius caelatus (Valenciennes, 1840) and Arius tenuispinis (Day, 1877) from Mumbai waters+
Authors: Sawant, Bhawesh T.; Chakraborty, S. K.; Jaiswar, A. K.; Bhagabati, Sarada K.; Kumar, Tarkeshwar; Sawant, Paramita B.
Abstract: Based on the
length weight data collected from New Ferry Wharf (NFW), Sasoon Docks (S.D)
& Versova landing centres, the length-weight relationship for two important
catfishes, Arius caelatus and A. tenuispinis from Mumbai waters has
been reported in the present communication. There is no significant difference
in growth between sexes for both the species, based on the ANACOVA test. Length-weight
relationship derived were W = 0.00419 * L 3.263 (R2 = 0.899) and W = 0.0306 * L 2.720
(R2 = 0.953), for A. caelatus and A. tenuispinis respectively. Growth
pattern study showed isometric growth for A.
caelatus and A. tenuispinis.
Ambience of physico-chemical characteristics to actinobacterial density in the Chennai coast of the Bay of Bengal, India
Title: Ambience of physico-chemical characteristics to actinobacterial density in the Chennai coast of the Bay of Bengal, India
Authors: Gnanam, S.; Sivakumar, K.; Vijayalakshmi, S.; Balasubramaniyan, T.
Abstract: Present study consists seasonal abundance
and relationship of actinobacteria with the important chemical characteristics
of the marine environment in both water and sediments. Actinobacterial density
exhibited clear seasonal variations, being highest (38 × 104 CFU/g
dry wt) in monsoon and lowest (13 × 104 CFU/g dry
wt) in summer, 2009. Seasonal variations of actinobaterial diversity showed is
positive correlation with water nutrients such as phosphate , nitrite, nitrate and
silicates and with sediment nutrients such as clay soil, total organic carbon,
total nitrogen and total phosphorus. Negative correlation was observed with
water temperature, salinity and pH. Monsoon and summer seasons exhibited the
major influence on the actinobacterial population in the marine environment of
Developmental biology of brackishwater copepod Oithona rigida Giesbrecht: A laboratory investigation
Title: Developmental biology of brackishwater copepod Oithona rigida Giesbrecht: A laboratory investigation
Authors: Santhanam, P; Perumal, P.
Abstract: In the present
study ,attempt was made on larval metamorphosis of cyclopoid copepod Oithona rigida under laboratory
condition. In the larval development, O. rigida has six naupliar and six copepodite stages precede the adult and
it reached adulthood early. Duration of development from egg to adult was 12
days at 28°C. Copepodite stages lasted longer than naupliar stages.
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