Effect of Mariculture on bio-optical properties and water quality of Gulf of Mannar and Palk Bay

Shaju, S S and Sreekutty, Prasad C and Vishnu, P S and Samal, Amir Kumar and Menon, Nandini and Nashad, M and Avarachen Mathew, K and Nazar, A K A and George, Grinson (2019) Effect of Mariculture on bio-optical properties and water quality of Gulf of Mannar and Palk Bay. Regional Studies in Marine Science, 29. pp. 1-9.

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    Abstract

    Marine cage aquaculture is gaining importance in India, due to its contribution as an alternate livelihood to coastal communities and also because of its export value. Water quality is the most important determinant for sustainable marine cage farming. Nutrient enrichment in coastal waters results in increased occurrence of algal blooms. A mariculture practice makes the coastal waters eutrophic due to increased input of nitrogen and phosphorous, ultimately leading to bloom. A phytoplankton bloom dominated by Trichodesmium species was detected outside mariculture cages located in Gulf of Mannar during August, 2015, which possibly interfered with fish gill function. High nutrient and chlorophyll a (Chl-a) (29.97 mg/m3) concentration were observed during peak bloom period. Three groups of phytoplankton were identified — diatoms (24 species with, 14 centric species and 10 pennate species), dinoflagellates (10 species) and cyanobacteria (one species). Stable salinity condition and the depletion in nutrient concentration due to higher primary production might have triggered the bloom of Trichodesmium. In-situ bio-optical measurements were also made to understand the spatial and temporal variation and effect of bloom on the optical components. Our study is a preliminary step to understanding the in-situ bio-geochemical and bio-optical characteristics of coastal waters of Gulf of Mannar and Palk Bay, which could aid in the management of cage culture sites.

    Item Type: Article
    Uncontrolled Keywords: Algal bloom; Mariculture; Trichodesmium; Bio-optical properties; Gulf of Mannar
    Subjects: Oceanography
    Oceanography > Seawater study
    Aquaculture > Mariculture
    Divisions: CMFRI-Kochi > Marine Capture > Fishery Resource Assessment
    Subject Area > CMFRI > CMFRI-Kochi > Marine Capture > Fishery Resource Assessment
    CMFRI-Kochi > Marine Capture > Fishery Resource Assessment
    Subject Area > CMFRI-Kochi > Marine Capture > Fishery Resource Assessment
    Depositing User: Arun Surendran
    Date Deposited: 20 Jul 2019 04:23
    Last Modified: 20 Jul 2019 04:23
    URI: http://eprints.cmfri.org.in/id/eprint/13704

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