The Indian Mackerel; VI Exploitation

The types of fishing craft and gear commonly used in the fishery have been evolved to suit the local requirement depending upon the physical characteristics of the coastline, surf conditions as well as habits of fish. Descriptive accounts of the types of these craft and gear, used both on the west and east coasts of India, are given by Hornell (1910a and 1938), Chopra (1951), Anon. (1941 and 1943), and Zeiner and Rasmussen (1958). Later Jones and Rosa (1965 and 1967) have listed the important types of fishing craft and gear commonly employed in the mackerel fishery. Similarly Rao (1969) has shown, among other things, the most common types of fishing boats and nets used in the Indian waters for this fishery

Food of the Indian mackerel, Rastrelliger kanagurta (Cuvier) taken by drift-nets in the Arabian sea off Vizhingam, South Kerala

Being one of the most important neritic pelagic specie:., the Indian mackerel, RastrelUger kanagurta (Cuvier), has been, the object of investigations by many fishery biologists. On the West Coast of India, while this species supports a rich commercial fishery, its distribution on the East Coast is only of biological interest. Most of the earlier works (Devanesan and John, 1940; Devanesan, 1942; John and Menon, 1942 and Chidambaram, 1944) are of brief notes dealing with the nature of food of the mackerel on the West Coast of India. In recent years, Chidambaram et al. (1952) have studied in detail the fat variations, sizo composition, maturity and food habits of the mackerel. Bhimachar and George (1952) have given a detailed account of the seasonal fluctuations in the food of this species from Calicut. Mention should be made of the comprehensive works of Pradhan (1956) and Sekharan (1958) on the fishery and certain biological aspscts of the mackerel from the Konkan Coast. Our knowledge on the biology of this species from the East Coast of India is confined to the recent works of Kuthalingam (1956) from Madras, Rao and Rao (1957) and Rao (1962) from Waltair

The Flatfishes

Among the food fishes which contribute to the marine fish production in India, flat fishes constitute an important element in the ground fish resources which, until recent years could not be exploited adequately due to the lack of suitable gear. The indigenous gear that are employed in the fishery for flatfishes are not quite eificient to capture them from the bottom; and are able to capture only when these fishes shoal in the surface and subsurface waters in the inshore area. Inspite of these drawbacks, the fishery produces an estimated average annual catch of 9,913 tonnes. There is a great possibility of increasing the production of flatfishes from the present level

Landings of a young spinner dolphin at Visakhapatnam,along Andhra coast

A young female spinner dolphin Stenella longtros Ms Gray, measuring 70.5 cm in total length was entangled in a gill net operated off Visakhapatnam at about 40 m depth on 21st August,1991

Unusual landings of bottlenose dolphin

A large sized male bottle nose dolphin (Tursio s oduncus Enrenberg] measuring 220 cm in tota P lengh and weighing about 180 kg was landed by a small trawler on 18 March at Visakhapatnam Fisheries Harbour

Whale shark landing

A male whale shark, Rhiniodon typus, 548cm Total length of about 2.5 tonnes, was caught entangled in gillnet operated at a depth of 40m was landed on 30 July at Visakhapatnam

On a class of translation planes of square order

AbstractA class of translation planes of order q2, where q = pr, p is a prime, p ⩾7, p ≠± 1 (mod 10) and r is an odd natural number is constructed and the translation complements of these planes are determined. A property shared by all these planes is that the translation complement fixes a distinguished point and divides the remaining distinguished points into two orbits of length q and q2 − q. The order of the translation complement is rq(q − 1)2 except for q = 7 and q = 13. The translation complements of these exceptional cases are also briefly studied. The class of planes considered in this paper are distinct from the classes of translation planes of S.D. Cohen and M.J. Ganley [Quart. J. Math. Oxford, 35 (1984) 101–113]

The Indian Mackerel; Technology and Industry

The chemical composition of fresh mackerel is reported by Chari (1948) as follows: Edible portion 61.60% Water 77.30% Protein 18.92% Fat 1,69% Ash 1.58% Phosphorus 0.69% Calcium (Ca 0) 0.62% Iron mg per 100 g 4.45% Venkataraman and Chari (1951) have given figure of average chemical composition as revealed by analyses carried over a period of 2 years from 1947 to 1949, which are mentioned below: Water 73.45% Protein 20.95% Fat 3.29% Ash 1.66