1. KAUTIR (Kerala Agricultural University Theses Information and Retrieval)

Permanent URI for this communityhttp://localhost:4000/handle/123456789/1

Browse

Filters

2017 - 201922020 - 20211

Settings

Subject: search.filters.subject.Marine fishery

Search Results

Now showing 1 - 3 of 3
  • No Thumbnail Available
    Item
    Impact of El Nino and La Nina on selected commercially important marine fishery resourced of Kerala
    (Academy of Climate Change Education and Research, Vellanikkara, 2021-01-21) Resna, K
  • No Thumbnail Available
    Item
    Inter-annual variability of thermal and chlorophyll fronts in selected parts of Eastern Arabian sea and their relation to marine fishery
    (Academy of Climate Change Education and Research Vellanikkara, 2017) Ananth C Babu; Grinson George
    In the marine ecosystem, distribution of fish, as well as abundance, is determined by the presence of conditions favourable for their existence. Among various oceanic features, frontal zones are important sites promoting fish aggregation and these zones are found to be ideal habitats for fish. Therefore, areas with higher incidence of fronts are likely to be associated with higher fish production, than those with lower frontal incidence. An evaluation of this concept based on total thermal/chlorophyll frontal area of the eastern Arabian Sea (50- 80oE; 0 to 30oN), was performed for the period July 2002 to December 2016. This work utilized 8-day averaged satellite Sea Surface Temperature observations (SST) from MODIS/AQUA sensor as well as 8-day averaged satellite chlorophyll a concentration (Chl-a) from the Ocean Colour Climate Change Initiative (OC- CCI) project. Frontal identification was based on Cayula-Cornillon (1992) single- image edge detection algorithm on the satellite SST/Chl-a image in ArcGIS platform. Seasonal variation of thermal fronts showed maximum frontal coverage (0.5 – 0.6 million km2) during the winter period.Thermal fronts have their lowest incidence (0.2 – 0.3 million km2) during post and pre-monsoon period, and moderate existence during the summer monsoon (0.3 – 0.4 million km2). Chlorophyll fronts showed a slightly different pattern with highest frontal coverage (0.5- 0.6 million km2) during winter period followed by pre and post monsoon period (0.4 – 0.5 million km2). Chlorophyll fronts had their lowest incidence (0.2 – 0.3 million km2) during summer monsoon period.Possible physical reasons for the seasonal variation in thermal and chlorophyll front incidence are discussed. Analysis of inter-annual variability of thermal fronts indicated an increasing trend during 2015 and 2016 whereas chlorophyll frontal area showed a sudden drop in values from mid-2012 onwards. During this period, the usual seasonal variation in frontal zones is not observed. The mechanism responsible for this unusual behaviour was also analysed. Spatial variability of frontal zones in the Arabian Sea indicated that the pattern of variability in the west is different from that of the eastern Arabian Sea. The impact of thermal as well as chlorophyll frontal areaon fisheries during the inter-annual cycle is also discussed.
  • No Thumbnail Available
    Item
    Problems and prospects of seafood exporters in Ernakulam district, Kerala
    (College of Co-operation Banking and Management, Vellanikkara, 2017) Hari Prakash, A; Arularasan, G S
    Indian fisheries and aquaculture are important sectors of food production providing nutritional security to the food basket, contributing to the agricultural exports and engaging about fourteen million people in varied activities. With diverse resources ranging from deep seas to lakes in the mountains and more than 10 percent of the global biodiversity in terms of fish and shellfish species, the country has shown continuous and sustained growth in fish production since Independence. Constituting about 4.4 percent of the global fish production, the sector contributes to 1.07 percent of the GDP and 4.7 percent of the agricultural GDP. The total fish production of 6.4 million metric tonnes presently has nearly 55 percent contribution from the inland sector and nearly the same from culture fisheries. Paradigm shifts in terms of increasing contributions from inland sector and further from aquaculture are significant over the years, with high growth rates. The different facets of marine fisheries, coastal aquaculture, and fisheries are increasingly being diversified, contributing to food, health, economy, exports, employment and tourism of the country. The present chapter intends to summarise the findings in the foregoing comprehensive analysis. It seeks to make a set of suggestions while highlighting various aspects of production and exports, it also analyses factors contributing to the exports of seafood exports in Ernakulum District. This study makes an effort to bring out the problems and prospects of the marine fishery sector, it further makes some indication for future research.