American Journal of Marine Science

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Article

Variations in Vertical Distribution of the Young of Two Commercial Bivalve Species Depending on Some Factors

1A.V. Zhirmunsky Institute of Marine Biology, Far East Branch of the Russian Academy of Sciences, Vladivostok, Russia


American Journal of Marine Science. 2015, 3(1), 22-35
doi: 10.12691/marine-3-1-3
Copyright © 2015 Science and Education Publishing

Cite this paper:
Delik D. Gabaev. Variations in Vertical Distribution of the Young of Two Commercial Bivalve Species Depending on Some Factors. American Journal of Marine Science. 2015; 3(1):22-35. doi: 10.12691/marine-3-1-3.

Correspondence to: Delik  D. Gabaev, A.V. Zhirmunsky Institute of Marine Biology, Far East Branch of the Russian Academy of Sciences, Vladivostok, Russia. Email: gabaevdd11@outlook.com

Abstract

The results of a long-term study of vertical distribution of the two main fouling species on scallop collectors of Japanese design—Japanese scallop, Mizuhopecten (= Patinopecten) yessoensis, and Pacific mussel, Mytilus trossulus—installed along the Primorsky Krai coast, Sea of Japan (East Sea), are presented in this article. The mussel, associated with Japanese scallop, is in fact its food competitor, which reduces its survival and growth rates. Settlement of scallop larvae begins earlier in shallow waters, i.e. in areas, where upper horizons are wormed up faster. A significant similarity in vertical distribution of juvenile scallop between stations is observed. The positive correlation between depth and vertical distribution of juvenile scallop is recorded most frequently in years with a high water temperature in June; for mussel, this relationship is always negative. Both climatic characteristics of year and position of the station exert influence on the depth of the maximum abundance of the young of the studied mollusks. Exposing scallop collectors at the optimum horizon, 9.5–15 m, promotes increase in the abundance of M. yessoensis and reduction in the abundance of M. trossulus.

Keywords

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Article

Isolation and Screening of Marine Bacteria Producing Anti-Cancer Enzyme L-Asparaginase

1Department of Applied Microbiology, Sri Padmavati Mahila Visvavidyalayam, Tirupati


American Journal of Marine Science. 2016, 4(1), 1-3
doi: 10.12691/marine-4-1-1
Copyright © 2016 Science and Education Publishing

Cite this paper:
M. Bhargavi, R. Jayamadhuri. Isolation and Screening of Marine Bacteria Producing Anti-Cancer Enzyme L-Asparaginase. American Journal of Marine Science. 2016; 4(1):1-3. doi: 10.12691/marine-4-1-1.

Correspondence to: M.  Bhargavi, Department of Applied Microbiology, Sri Padmavati Mahila Visvavidyalayam, Tirupati. Email: vkrbhargavi@gmail.com

Abstract

PURPOSE: The objective of this investigation was to isolation and screening of marine bacteria for L-asparaginase activity. METHODS: Marine bacteria were isolated from water samples obtained from Kerala sea coast in India. The isolates were identified as marine bacteria by microscopical and bio-chemical tests. Production of L-asparaginase was carried out in submerged fermentation media (glycerol asparagine media). RESULTS: Among three marine isolates subjected to screening only one isolate BKJM-VB showed potential L-asparaginase activity. CONCLUSION: The study revealed that marine bacteria may be a potential source of high yield, high substrate specificity L-asparaginase which is an anti-leukemic agent.

Keywords

References

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Article

Studies on Seasonal Variation and Effect of Heavy Metal Pollution on Microbial Load of Marine Sediment

1Department of Microbiology, University of Port Harcourt, PMB 5323, Port Harcourt, Nigeria


American Journal of Marine Science. 2016, 4(1), 4-10
doi: 10.12691/marine-4-1-2
Copyright © 2016 Science and Education Publishing

Cite this paper:
Esther Ebah, Ichor Tersagh, Gideon C. Okpokwasili. Studies on Seasonal Variation and Effect of Heavy Metal Pollution on Microbial Load of Marine Sediment. American Journal of Marine Science. 2016; 4(1):4-10. doi: 10.12691/marine-4-1-2.

Correspondence to: Ichor  Tersagh, Department of Microbiology, University of Port Harcourt, PMB 5323, Port Harcourt, Nigeria. Email: smartichor@uam.edu.ng

Abstract

Sediment samples were collected from 15 stations at Onne Port, Rivers State, Nigeria, during the dry and rainy seasons of 2012 to determine the spatial distribution, seasonal and temporal variation and effect of different heavy metal contents on microbial load. The heavy metals; chromium, cadmium, copper, nickel, zinc, mercury, tin and arsenic were analyzed using atomic absorption spectrophotometer and compared with different standard and reference values of TELS (threshold effect levels) and PELS (probable effect levels). Total heterotrophic bacterial and fungal counts were evaluated using the spread plate technique. Heavy metals accumulated in the sediment during the dry season in the order As > Hg >Zn >Ni >Sn>Cr >Cd >Cu and in the wet season in the order As >Sn>Zn >Ni >Hg >Cr >Cd >Cu and ranged from 0.001 to 15.1 mg/kg and 0.001 to 13.2 mg/kg for dry and wet seasons respectively. The concentrations of heavy metals demonstrated a unique seasonal pattern with the highest concentration during the dry season and lowest during the wet season. The log count of total heterotrophic bacteria varied between 5.81 cfu/g and 5.37cfu/g for dry and wet season respectively and total fungal counts varied between 4.95cfu/g and 4.80cfu/g for dry and wet seasons respectively. There was no significant correlation between heavy metal concentration and microbial load. Although the levels of the heavy metals determined were within regulatory limits, destruction of wetland biomass will release the heavy metals into the environment with the risk of metals entering the food chain. To check the pollution in marine sediment, the anthropogenic sources of pollution should be at minimal level.

Keywords

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