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    ABSTRACT: Ring seines are lightly constructed purse seines adapted for operation in the traditional sector. Fish production and energy requirement in the ring seine operations, off Cochin, Kerala, India are discussed in this paper, based on data collected during 1997-1998. The results reflect the Gross Energy Require-ment (GER) situation that existed during 1997-1998. Mean catch per ring seiner per year worked out to be 211.9 t of which sardines (Sardinella spp.) constituted 44.3%, followed by Indian mackerel (Rastrelliger kanagurta) 29.7%, carangids 11.4%, penaeid prawns 2.2%, pomfrets 1.1% and miscella-neous fish 11.3%. Total energy inputs into the ring seine operations were estimated to be 1300.8 GJ. Output by way of fish production was determined to be 931.85 GJ. GER is the sum of all non-renewable energy resources consumed in making available a product or service and is a measure of intensity of non-renewable resource use. GER per tonne of fish landed by ring seiners was estimated to be 6.14. Among the operational inputs, kerosene constituted 73.4% of the GER, followed by petrol (12.7%), diesel (6.7%) and lubricating oil (2.4%). Fishing gear contributed 3.8%, engine 0.8% and fishing craft 0.3% of the GER. Energy ratio for ring seining was 0.72 and energy intensity 1.40.
    Full-text · Article · Aug 2012
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    ABSTRACT: The area west of Kollam (38-51 m depth) and south-west of Cochin (38 – 45 m depth) seems to be the preferred region for spawning of the pharaoh cuttlefish Sepia pharaonis along the south-west coast of India. Juveniles appear to stay for some time in the spawning ground and then undertake offshore migration towards relatively deeper areas of the Wadge Bank in 117-132 m depth range. This migration appears to take place via west of Vizhinjam in the depth range of 60 -86 m. Fecundity varies from 146 to 1400 eggs, depending upon the size of the animal. S. pharaonis appears to spawn intermittently with group-synchronous ovulation. Spawning appears to be monocyclic and egg-laying occurs in separate batches during the spawning period. Egg capsules are either inserted in to the muddy substratum or fastened on the preferred objects apart from entangling with each other.
    Full-text · Article · Jul 2011 · Indian Journal of Fisheries

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