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Muraleedharan, K. R.
- 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
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: 773-778Abstract
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
References
- Kurup, P. G., Studies on the physical aspects of the mudbanks along the Kerala coast with reference to the Purakkad mudbank. Bull. Dept. Mar. Sci., 1977, 8, 1–72.
- Dora, Y. L., Damodaran, R., Jose and Anto, V., Texture of Narakkal mudbank sediments. Bull. Dept. Mar. Biol. Oceanogr., 1968, 4, 1–10.
- Venkatachala, B. S., Kar, R. R., Suchindan, G. K., Ramachandran, K. K. and Kumar, M., Study on the sedimentary facies, sporepollen and palynodebris of mudbank and Vembanad Lake, Kerala. Geophytology, 1992, 22, 245–254.
- Gopinathan, C. K. and Qasim, S. Z., Mudbanks of Kerala their formation and characteristics. Indian J. Mar. Sci., 1974, 3, 105–114.
- Silas, E. G., Mudbanks of Kerala–Karnataka: need for an integrated study. Bull. Cent. Mar. Fish. Res. Inst., 1984, 31, 2–7.
- Macpherson, H. and Kurup, P. G., Wave dampening at Kerala mudbank. Indian J. Mar. Sci., 1981, 10, 154–160.
- Mathew, J., Baba, M. and Kurian, N. P., Mudbanks of the south west coast of India I: wave characteristics. J. Coast. Res., 1995, 11, 168–178.
- Erattupuzha, J. J. and Raman, H., Shore erosion and shore protection in Kerala. In Proceedings of the Symposium Coastal Erosion and Protection in Kerala, Kerala Engineering Research Institute, Peechi, 1971, pp. 7.1–7.15.
- Parvathy, K. G., Noujas, V., Thomas, K. V. and Ramesh, H., Impact of mudbanks on coastal dynamics, Aquatic Procedia, 2015, 4, 1514–1521.
- Pinkerton, Collection of voyages and travels. Administration Report of 1860 of Travancore.
- Dinesh Kumar, P. K., Balachandran, K. K., Prasanna Kumar, S. and Ramaiah, N., Workshop on mudbank. Indian J. Mar. Sci., 2014, 42, 954–955.
- Regunathan, A., Mathew, K. J., Rao, D. S., Gopinathan, C. P., Surendranatha Kurup, N. and Murty, A. V. S., Fish and fisheries of mudbank, Bull. Cent. Mar. Fish. Res. Inst., 1984, 31, 60–71.
- Grasshoff, K., Ehrhardt, M. and Kremling, K., In Methods of Seawater Analysis, Verlag Chemie, Weinheim, Germany, 1983, pp. 89–224.
- Gupta, G. V. M. et al., Evolution to decay of upwelling and associated biogeochemistry over the southeastern Arabian Sea shelf. J. Geophys. Res. Biogeosci., 2015, 121, 159–175; doi:10.1002/2015JG003163.
- Antony, M. K. and Unnikrishnan, A. S., On an upwelling front, propagation of upwelling and vertical velocity in the eastern Arabian Sea during monsoon, 1987. In Proceedings of the conference for Pacific Ocean Environments and Probing, Okinawa, 1992, vol. 1, pp. 527–532.
- Occurrence of White Gelatinous Foam on the Beaches of Kollam (Southwest Coast of India) Due to the Senescent Bloom of Phaeocystis Globosa
Abstract Views :209 |
PDF Views:64
Authors
N. V. Madhu
1,
P. Anil
1,
C. R. Vishal
1,
K. R. Muraleedharan
1,
A. Parvathi
1,
T. Gireesh Kumar
1,
K. S. Arya
1,
S. Hafza
1
Affiliations
1 CSIR-National Institute of Oceanography, Regional Centre, Kochi 682 018, IN
1 CSIR-National Institute of Oceanography, Regional Centre, Kochi 682 018, IN
Source
Current Science, Vol 119, No 8 (2020), Pagination: 1371-1375Abstract
An unusual white gelatinous foam (~2 ft high) was detected on the beaches of Kollam (Mundakkal), Kerala, southwest coast of India. It extended to ~300 m alongshore on 10 June 2019 from 7 am and sustained till around 10 am. CSIR-National Institute of Oceanography, Regional Centre, Kochi conducted a field survey and water sampling in the foam-affected coastal region on 11 June 2019 to identify the scientific cause behind this unusual foam formation. Analytical results of the study showed enhanced inorganic nutrients and dissolved forms of organic matter, carbon and nitrogen. The proliferation of a marine prymnesiophyte, Phaeocystis globosa Scherffel (>320 × 103 cells l–1) in its diploid flagellate stage was detected in the samples along with a higher abundance of prokaryotes (>1.2 × 106 VLPs ml–1) and viruses (>4 × 107 VLPs ml–1–1). The study revealed that this foam event in Kollam beach area was merely the biogeochemical manifestation of the senescent bloom of P. globosa. Furthermore, since the foam formation due to blooming of P. globosa is the rarest coastal event in tropical marine waters, the study in the Indian waters (Kollam beach) is highly significant considering its potential impact on the marine ecosystems.Keywords
Algal Bloom, Coastal Water, Gelatinous Foam, Phytoplankton, Phaeocystis globosa.Full Text