NOPR Collection:

Status of the seawater quality at few industrially important coasts of Gujarat (India) off Arabian Sea

2012-02-01T00:00:00Z

Title: Status of the seawater quality at few industrially important coasts of Gujarat (India) off Arabian Sea Authors: Bhadja, Poonam; Kundu, Rahul Abstract: Present study reports the spatial and temporal variations of the seawater quality from five major shores along the South Saurashtra coastline (India). The results suggested normal range of physical, chemical and biological characteristics in the samples of Dwarka and Mangrol as these coasts are not affected by any apparent anthropogenic effects of any kind. The results also suggested considerable anthropogenic load to the coastal waters of three other shores studied where moderate to high degree of industrial activities existed. Results of the present study revealed that the spatio-temporal variations of water quality parameters were considerably affected by anthropogenic impacts at Veraval, moderately at Kodinar and somewhat lesser degree at Diu. Page(s): 90-97

In vitro and in vivo biocontrol of Vibrio harveyi using indigenous bacterium, Bacillus spp.

2012-02-01T00:00:00Z

Title: In vitro and in vivo biocontrol of Vibrio harveyi using indigenous bacterium, Bacillus spp. Authors: Janarthanam, K; George, M Rosalind; John, K Riji; Jeyaseelan, M J Prince Abstract: The present study was undertaken to find out the potential of indigenously isolated Bacillus spp. in controlling virulent luminous Vibrio harveyi infection in shrimp in vitro and in vivo. Luminescent bacteria were isolated from shrimp farms of east coast of India. It is biochemically and genetically identified as Vibrio harveyi. Two isolates of Vibrio harveyi obtained from infected shrimps were used for pathogenicity studies in juvenile shrimps and the LD50 values for the above isolates ranged between 3.7 x 10⁶to 8.9 x 10⁷ CFU/ml. Indigenously isolated and identified Bacillus spp. exhibiting antagonism were used for controlling the Vibrio infection both in vivo and in vitro. In vivo antagonistic activity was studied with three selected Bacillus isolates. The same had reduced the mortality of Penaeus monodon juveniles when challenged with V. harveyi with an RPS of 87.5 - 50%. This is without affecting the multiplication of the pathogen in water. Present study found that indigenously isolated antagonistic Bacillus sp. could be used as effective biocontrol agents against pathogenic luminescent V. harveyi. Page(s): 83-89

Effect of Excoecaria agallocha leaves against Aeromonas hydrophila in marine ornamental fish, Amphiprion sebae

2012-02-01T00:00:00Z

Title: Effect of Excoecaria agallocha leaves against Aeromonas hydrophila in marine ornamental fish, Amphiprion sebae Authors: Dhayanithi, N B; Ajith Kumar, T T; Balasubramanian, T Abstract: Present study was performed to validate the potential of mangrove, Excoecaria agallocha leaves against Aeromonas hydrophila isolated from infected marine ornamental fish, Amphiprion sebae. Infected ten fish samples were collected from the marine ornamental fish hatchery and the bacteria was isolated and identified as Aeromonas hydrophila. Antibiotic resistance characterization was performed with commercial antibiotics. In vitro antibacterial activity of methanol and acetone extract of Excoecaria agallocha and their minimum inhibitory concentration (MIC) were assessed. Healthy Amphiprion sebae when challenged with the Aeromonas hydrophila, resulted in the development of clinical signs, those observed in the hatchery. The methanol extract of Excoecaria agallocha leaf was administrated with live A. hydrophila, decreased the percentage of mortality in the experimental groups. The phytochemical screening of the extract showed the presence of alkaloids, phytosterols, fixed oils and fats, tannins, phenolic compounds, proteins, free amino acids, gums, mucilage, flavonoids and lignin. The results revealed that the Excoecaria agallocha leaves have the potential to control the Aeromonas hydrophila diseases in marine ornamental fish, Amphiprion sebae. Page(s): 76-82

State of three estuaries of Gulf of Khambhat

2012-02-01T00:00:00Z

Title: State of three estuaries of Gulf of Khambhat Authors: Deshkar, Sonal; Lakhmapurkar, Jayendra; Gavali, Deepa Abstract: Present study deals with the physico-chemical parameters in three main estuaries of Gulf of Khambhat (The Narmada, Mahi and Sabarmati). Parameters like the Dissolved Oxygen, Biological oxygen demand, Salinity, all major nutrients and Petroleum Hydrocarbons have been studied in detail. Comparison between the three estuaries for the nutrient load is discussed in detail. One-way ANOVA suggests the significant difference between the three estuaries which are discussed in detail. The correlation between various parameters is also discussed. It is concluded from the present study that out of the three estuaries Sabarmati estuary is having high and Narmada estuary is least nutrient load. Page(s): 70-75