Present status of pen and cage culture of finfishes in Southeast Asia

Cage and pen culture practices in certain Southeast Asian countries viz. India, Bangladesh, Sri Lanka, Indonesia, Singapore, Malaysia, Thailand, Cambodia, Vietnam and Philippines have been reviewed in this paper The various methods adnpted and materials used in the design and construction of cages and pens and the different species of fishes cultured in these two systems are discussed. The possibilities for adopting pen and cage culture practices for fish production in !ndia are also indicate

A new species of Argulus (Brachiura) from a marine fish Psammoperca waigiensis (Cuvier)

A specimen of ArguluJ taken from the body surface of the marine perch Psammo- perca waigiensis (Cuvier) caught from the Palk Bay near Mandapam has been found to be a new species, and its description is given here. Species and subspecies of the genus Argulus Milller so far recorded from India are A. indieus Weber, A. gigan- teus Ramakrishna, A. bengalen.ri.r Ramakrishna, A. siameni-is Wilson, A. siamensis penin.rulari.r Ramakrishna and A. puthenvelien.ri.r Ramakrishna (see Ramakrishna, 1951, 1962 ) . The postembryonic development of A. puthenvelien.ri.r has been dealt with by Thomas (1961). Thomas & Devaraj (in press) have described two new species, namely A. fluviatili.r and A. cauveriensis collected from the river Cauvery

Abnormality in the right chela of the Portunid Crab, Portunus pelagicus Linnaeus

An abnormal male crab of Portunus pelagicus Linnaeus was obtained on 9th June, 1971 from the gill net (Nandu Valai) landings at Devipattinam (Palk Bay). The abnonnality is noted on the right chela. A brief description of the specimen is given

Observationts on moulting of crab Portunus pelagicus Linnaeus reared in the laboratory

Young crabs of Portunus pelagicus of the size group between 11 and 44 mm in carapace width were collected from the inshore waters off Mandapam and were reared. Crabs measuring between 11 and 25 mm in carapace width attained marketable size of 140—145 mm at the twelfth moult after a period of fourteen months. Moulting occurred frequently in the young crabs measuring between 11 and 75 mm and thereafter, the interval between the two successive moults increased. The weight of the reared crabs at different sizes was comparable to that of freshly caught from the sea. Regeneration of chelipeds and legs was studied in P. pelagicus by removing a single appendage at one time. After about 4 to 7 days rudiment appendage was found to develop from the basis and it completely regenerated to normal size at the next moult

On the meat content of Portunus pelagicus with some Observations on lunar periodicity in relation to Abundance, weight and moulting

Study shows that the male orabs of Portunus pelagicus contain more meat than feamles. Crab catches were relatively good during the new moon phase than during the full moon phase. The variation in the weight of P. pelagicus during the two moon phases is much less. The recently-moulted crabs in the commercial catches were relatively more during the new moon phase than in full moon period

On the moulting of Portunus pelagicus Linnaeus

Some of the interesting informations on the moulting of laboratory-reared crabs of Portunus pelagicus Linnaeus are given with illustrations

Chemical composition of the swimming crab Portunus pelagicus Linnaeus

The results of the chemical analyses (moisture, ash, fat and protein) of the male and female crab of Portunus pelagicus Linnaeus with shell and meat are given in this paper. The differences in th-s composition between the whole crab and edible meat and the economic uses of crab are also given

Some Foraminifera from the Palk Bay

Four species of Foraminifera, namely Fissurina ventricosa (Wiesner), Nonion grateloup(d' Orbigay), Nonionella auricula Heron-Allen and Earland and Bolivina variabilis were found in the stomach contents of the prawn, Penaeus semtsulcatus. These appear to be new records from the Palk Bay. All the four species have been described and figured

Fishery of the swimming crab Portunus pelagicus Linnaeus from Palk bay and Gulf of Mannar

Fishery of Portunus pelagicus Linnaeus along the Palk Bay and Gulf Mannar is by a type of gill net locally known as nandu valai. They are also caught an large numbers in trawls operated by mechanised boats. The monthly catch p«r unit effort at the three major crab fishing centres Devipattiaraam, Vedalai and Mandapam is estimated for three years and Vedialal* is- found to be the most productive centre for crabs. Some information regarding the marketing, disposal, longevity of life outside seai water aid sound production are also given

Relation between tail and total lengths and total And carapace lengths for three commercial species of Penaeid prawns of India

Prawns are brought to the processing factories in deheaded condition. In view of the fluctuating nature of the prawn fisheries and the importance of size composition in population studies, the relation between tail length and total length and total length and carapace length for male and females of Metapenaeus dobsani, M. affinis and Frapetieopsis stylifera was calculated. The relationship appears to be Mnear for the range of sizes examined