NISCAIR Online Periodicals Repository Collection: IJMS Vol.39(1) [March 2010]

Diurnal variability of heat fluxes over the coastal waters off Visakhapatnam during post-monsoon and winter seasons

Fri, 26 Feb 2010 22:58:59 GMT

Title: Diurnal variability of heat fluxes over the coastal waters off Visakhapatnam during post-monsoon and winter seasons

Authors: Ramu, Ch. Venkata; Bharathi, G; Sadhuram, Y; Prasad, K V S R

Abstract: Diurnal variability of heat fluxes in the coastal waters of Visakhapatnam has been studied during post-monsoon (Oct, 2006) and winter (Jan-Feb, 2007) seasons utilizing the surface meteorological data and radiation measurements on-board CRV Sagar Sukti and mechanized boats. Estimated values of short and long wave radiation are well comparable with the measured values. Latent (Q_LH) and sensible (Q_SH) heat fluxes are computed from bulk aerodynamic method. Total enthalpy (i.e. Q_LH+Q_SH) was 50-200W/m²and 10-200W/m²(on diurnal scale), during post monsoon and winter seasons respectively. The net heat exchange (Q_N) was 137W/m² and 92W/m² under the above seasons. Daily mean values of Bowen Ratio (B) in the study region varied between 0.02 and 0.14,. A simple relationship [(B=0.057(Ts-Ta)^0.89; N = 20; r = 0.82; significant at > 99% level)] between Bowen’s ratio (B) and sea-air temperature difference has been proposed for unstable conditions. High correlation (r = 0.87) is found between the values of Q_LH estimated and obtained from the above relationship.

Page(s): 128-135

Carapace width and weight relationships, condition factor, relative condition factor and gonado-somatic index (GSI) of mud crabs (Scylla spp.) from Chilika Lagoon, India.

Fri, 26 Feb 2010 22:58:59 GMT

Title: Carapace width and weight relationships, condition factor, relative condition factor and gonado-somatic index (GSI) of mud crabs (Scylla spp.) from Chilika Lagoon, India.

Authors: Mohapatra, Anil; Mohanty, Rajeeb K; Mohanty, Surya K; Dey, S K

Abstract: Carapace width (CW)-weight relationship, condition factor (K), relative condition factor (Kn) and gonado-somatic index (GSI) for meaty and post-moulted crabs of both sexes of the two mud crab species, Scylla serrata (Forskal) and S. tranquebarica (Fabricius) co-existing in Chilika lagoon, Orissa, India, were studied during August, 2005 to July, 2007. CW-weight equations and correlation co-efficient (r) obtained for both sexes of meaty and water crabs of the two species were significant (P< 0.05-0.01). Regression slopes (b) were higher for males and fattened crabs in both the species. The K and Kn values recorded in each month for different size groups of both sexes of the two species were higher in male and values were relatively higher in S. tranquebarica than S. serrata. Increase in Kn values beyond 1.0 from 81-91 mm CW in S. serrata and 111-120 mm CW in S. tranquebarica indicated the size at first maturity. Higher monthly values indicated that breeding period was extended from August-November and March-July in S. serrata and S. tranquebarica respectively. Species-specific study aimed at establishing difference in biological characters between two species of Scylla[a^′] from same brackishwater habitat. CW-weight relationship may be useful in setting feeding rates for a particular species in aquaculture.

Page(s): 120-127

Studies on captive breeding and larval rearing of clown fish [a¹], Amphiprion sebae (Bleeker, 1853) using estuarine water

Fri, 26 Feb 2010 22:58:59 GMT

Title: Studies on captive breeding and larval rearing of clown fish [a¹], Amphiprion sebae (Bleeker, 1853) using estuarine water

Authors: Kumar, T T Ajith; Setu, Subodh Kant; Murugesan, P; Balasubramanian, T

Abstract: An attempt was made to study the captive breeding and larval rearing of Amphiprion sebae by using estuarine water. Sub-adults of the anemone fish [a²], A. sebae were procured from the traders with the size range of 4-6cm and acclimatized to captive condition. After 2 months of acclimatization [a³], pair was formed. At the end of 4^th month, the fishes were spawned. After 6-8 days of incubation hatching took place and the larvae metamorphosed in 15-18 days. Rotifer, Brachionus plicatilis and Artemia nauplii were fed to the larvae gave a maximum survival rate. Total larval survival in the present study was 55%. The babies reached the marketable size in 3 months.

Page(s): 114-119

Effect of addition of nitrogen, phosphorus and potassium fertilizers on biodegradation of crude oil by marine bacteria

Fri, 26 Feb 2010 22:58:59 GMT

Title: Effect of addition of nitrogen, phosphorus and potassium fertilizers on biodegradation of crude oil by marine bacteria

Authors: Vyas, Trupti K; Dave, B P

Abstract: Role of marine bacteria viz. Marinococcus albus, Methylobacterium mesophilicum and Nocardia otitidiscaviarum in bioremediation of crude oil contaminated Alang sea coast has been evaluated in the present study. Optimum concentrations of inorganic nutrients N, P & K as urea, super phos and potash fertilizers respectively on growth and degradation has been determined. Addition of optimum concentrations of N (1%), P (0.5%) and K (0.01%) in combination significantly enhanced biodegradation by 22 to 32%. Bioremediation studies indicated that a Bacterial consortium (BC) exhibited maximum growth and degradation on addition of optimum concentrations of N, P and K. Maximum effect in increase in growth was on a BC (0.54 mg/ml) whereas, maximum effect on increase in degradation was on N. otitidiscaviarum (31.9%). However, complete degradation was not possible due to the presence of recalcitrant molecules and accumulation of toxic metabolites during biodegradation. Three isolates can successfully be used to formulate a successful bioremediation strategy for oil contaminated marine environment.

Page(s): 143-150

NISCAIR Online Periodicals Repository Collection: IJMS Vol.39(1) [March 2010]

Diurnal variability of heat fluxes over the coastal waters off Visakhapatnam during post-monsoon and winter seasons

Carapace width and weight relationships, condition factor, relative condition factor and gonado-somatic index (GSI) of mud crabs (Scylla spp.) from Chilika Lagoon, India.

Studies on captive breeding and larval rearing of clown fish [a1], Amphiprion sebae (Bleeker, 1853) using estuarine water

Effect of addition of nitrogen, phosphorus and potassium fertilizers on biodegradation of crude oil by marine bacteria

Studies on captive breeding and larval rearing of clown fish [a¹], Amphiprion sebae (Bleeker, 1853) using estuarine water