The Growth and regeneration of an aquarium-held Spiny lobster, Panulirus polyphagus (Herbst) (Crustacea: Decapoda: Palinuridae)

Growth of spiny lobster, Panulirus polyphagus (Herbst) in captivity is reported. The lobster was maintained in the laboratory aquarium tank for 31 days during Which period it moulted t^Vice, the first moult occurring on the day following capture and the second moult after an interval of 29 days. Brief notes on the growth, regeneration of thes right antenna! ilagellum and the effect of regeneration on the growth of the lobster observed during the period are given

On the occurrence of the puerulus larvae of the Indian spiny lobster, Panulirus homarus (Linn.), In Cochin backwater

The occurrence of puerulus larvae of the Indian spiny lobster, Panulirus homarus (Linn.) in tt» Cochin backwater is reported. Being the first record of these larvae frcmi Indian waters, brief notes on the puerulus, its metamorphosis to postpuerulus and the probable significance of their occurrence in the estuary are give

Occurrence of maturing females of Kuruma Prawn,Penaeus japonicus in the mariculture farm at Muttukadu

In December, 1983 about 2,000 numbers of seed of Penaeus japonicus (average size: 42.2 mm) collected from wild were stocked in a 0.4 ha pond (No. A-4) at the Mariculture Farm, Muttukadu, Madras. All the males were mature, as the white mass was seen at the base of fifth walking legs. In the case of females, all the specimens were found to have developing ovaries, when they were seen against the light. Earlier records of maturing/matured penaeid prawns of India in low saline waters include Metapenaeus dobsoni from open backwaters of Cochin and perennial culture fields of Vypeen Islands, Kerala and Metapenaeus moyebi from Pulicat Lake on the Madras coast. The present observation enlists Penaeus japonicus with those prawns attaining maturity in low saline waters, or to say precisely in confined waters

STATISTICAL MODEL BASED OPTIMAL PREDICTION ON DRILLING PARAMETERS

The drilling is an imperative machining practice in the mechanical field for fitting or cutting the materials devoid of any disturbance. Various elements are basically employed within the automobile applications on account of the light weight, exceptional firmness and the moderate cheapness. The effectiveness of the drilled opening for the material shields is expanded by minimizing the eccentricity factor. The eccentricity is a degree of the nature of a drilled hole, and the process is based on input parameters. The significant intention of the suggested procedure is to built a mathematical modeling   with the support  of the optimization techniques. The mathematical modeling is done by minimizing the time consumed in the case of extension of the real time experiment. It is utilized to predict the diameter of the drill whole entry and exit, material removal rate and the eccentricity factor for the drilling process. Different optimization algorithms are utilized to find the optimal weights α and β of the mathematical modeling. All the optimum results demonstrate that the attained error values between the output of the experimental values and the predicted values are near equal to zero in the designed model. From the results, the minimum error 97.2% is determined by the mathematical modeling attained in the Artificial Fish Swarm Optimization (AFSO) process

Notes on the juveniles of the rock cod Epinephelus tauvina (Forsskal)

The occurrence of the very young juveniles of the rock cod Epinephelus tauvina (Forskal) in Cochin backwater during February-June is reported here with brief notes on the morphometric variations between juveniles and adults and food and feeding habits of juveniles

Crab resources and prospects for crab culture

INTRODUCTION and Daniel (1971), no information is available on the abundance and exploitation of commercially important The average annual crab landings during 1975-1981 from the Indian coast are 21,310 tonnes, forming species from these Islands. 10.4 % of the total crustacean landings. Rao et al. (1973) have estimated the total crab resources of the Indian seas at 43,000 tonnes, and nearly half of the estimated OBSERVATIONS resources are at present being exploited. Out of 8 species of edible crabs listed by Rao et al. (1973), Scylla serrata (Forsskal), Portmus pelagicus (Linnaeus) and P. sangutnolentus (Herbst) have been the principal species in the exploited fishery along the coasts of the country. Except for the faunistic records of these edible crabs from Andaman and Nicobar Islands by Alcock (1899), Chopra (1935), Sankarankutty (1961) and Premkumar Data on the type of gear employed, species of crab exploited, estimated catch on the day of observation an catch trend in earlier period were collected during th present survey carried out in January-April 1978 Fig. 1 gives the characters for identification of the loca species of crabs. A key for field identification of th species is given in the Appendix

Biology, Population and Exploitation of the Indian Deep-Sea Spiny Lobster, Puerulus sewelli Ramadan

The occurrence of the deep-sea spiny lobster or the whip lobster Puerulus sewelli Ramadan off Kerala coast and in the Gulf of Manner was reported as early as the turn of this centur

Biodiversity of Medicinal Plants in Thudaripettai Village, Nagapattinam District, Tamil Nadu, India

The medicinal plants have received more attention among researchers to treat various diseases and disorders. This study was aimed to record the various medicinal plants present in Thudaripettai Village situated in Tharangambadi Taluk, Nagapattinam district of Tamil Nadu. A total of 60 plant species belonging to 35 families were reported with their medicinal values. These results will provide information about medicinal plants and methods of utilization of these plants to cure various diseases of mankind. Survey of the information of medicinal plants used by the villagers were collected and arranged alphabetically followed by common name, vernacular name, family name, parts of use, methods of uses, medicinal uses and their habit. The information is very much useful for further research which will lead to the discovery of new bioactive compounds from the above medicinal plants

Nursery ground for early juveniles of tiger prawn in Kovalam backwater near Madras

The article describes about the suitability of Kovalam backwater region near Madras for utilizing as the collection ground for juveniles of tiger prawn that can be used for farming