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Naqvi, S. W. A.

Understanding our seas:National Institute of Oceanography, Goa

Understanding our Seas: National Institute of Oceanography, Goa

Cyclone Phyan-Induced Plankton Community Succession in the Coastal Waters off Goa, India

Fragilariopsis Sp. Bloom Causes Yellowish-Brown Waters Off Alappuzha, South-Central Kerala Coast, India, during the Mud Bank-Upwelling Phase

Abstract Views :226 | PDF Views:88

Authors

R. Jyothibabu ¹, N. Arunpandi ¹, C. Karnan ¹, L. Jagadeesan ¹, T. M. Manojkumar ¹, K. K. Balachandran ¹, S. W. A. Naqvi ²

Affiliations
1 CSIR-National Institute of Oceanography, Regional Centre, Kochi 682 018, IN
2 CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, IN

Source

Current Science, Vol 115, No 1 (2018), Pagination: 152-159

Abstract

Mud banks (Chakara) of Kerala are calm coastal waters that form in several isolated stretches along the coast usually during the southwest monsoon (SWM) period (June–September). They are characterized by the damping of incident waves, generating localized calm sea environment conducive for fishing activities, while the high monsoon waves create hostile environment in the rest of the region. Here, we present the scientific basis of the yellowish-brown discoloration of water column that occurs off Alappuzha, Kerala annually during the peak and late SWM associated with coastal upwelling-mud bank event. The discoloured waters that occur off Alappuzha associated with these events are locally known as ‘pola vellam’, which is nothing but diatom blooms. In 2014, pola vellam was actually caused by the bloom of Fragilariopsis (= Fragilaria) sp.; hereafter Fragilariopsis, which was widespread in the study region, even beyond the mud bank domain. This bloom feature is attributable to the nutrient enrichment associated with intense coastal upwelling that was dominant over a larger spatial extent in the study domain, including the mud bank. FlowCAM-based plankton data strongly support the above view, as the abundance, biovolume and biomass of Fragilariopsis had similar temporal trend both in the mud bank and non-mud bank regions. The general ecology and importance of Fragilariopsis bloom in the study domain, from the point of view of commercial fisheries, is also elaborated in this communication.

Keywords

Bloom, Coastal Upwelling, Fragilariopsis sp., Mud Bank, Fisheries.

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References

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Karnan, C., Jyothibabu, R., Arunpandi, N., Jagadeesan, L., Prathihari, A., Balachandran, K. K. and Naqvi, S. W. A., Discriminating the role of coastal upwelling and mud bank in structuring the plankton size and lower level food web along the southwest coast of India. J. Mar. Syst., 2017, 172, 24–42.

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Mudbanks and Fisheries Along the Kerala Coast – Myth and Reality

Abstract Views :212 | PDF Views:73

Authors

S. Prasanna Kumar ¹, P. K. Dinesh Kumar ², K. R. Muraleedharan ², Grinson George ³, Dayana Mathew ², V. Kripa ³, R. Jeyabaskaran ³, N. Ramaiah ¹, A. Gopalakrishnan ³, S. W. A. Naqvi ¹

Affiliations
1 CSIR-National Institute of Oceanography, Dona Paula, Goa - 403 004, IN
2 CSIR-National Institute of Oceanography Regional Centre, Dr Salim Ali Road, Kochi - 682 018, IN
3 Central Marine Fisheries Research Institute, Ernakulam North PO, Kochi - 682 018, IN

Source

Current Science, Vol 115, No 4 (2018), Pagination: 773-778

Abstract

Mudbanks, a unique coastal oceanographic phenomenon occurring along the southwest (SW) coast of India during the SW monsoon season, are synonymous with the fishery of this region. Here we examine the validity of the popular notion that mudbanks directly support rich fisheries, using a high temporal resolution water column data collected from the Alappuzha mudbank region in Kerala during April to September 2014, in conjunction with fisheries data. Our study reveals that the upwelling which occurs during the SW monsoon season along this coast brings oxygen-deficient subsurface water to the upper water column. Escaping the oxygen-depleted waters, the fish aggregate within a thin upper layer allowing easy visual identification and capture of fish shoals. This process occurs throughout the coast and is not confined just to the mudbanks. Mudbank being a calm region, traditional fishermen using non-motorized country craft were able to carry out fishing within this region only during the SW monsoon. With the induction of motorized and mechanized fishing, the link between mudbanks and fisheries is becoming less prominent, although the former still continue to be important fish landing centres.

Keywords

Mudbank, Monsoon, Suspended Sediments, Pelagic and Demersal Fishery, Upwelling.

Full Text

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