A new polychaete of the family Pilargidae from Palk Bay, South India

The family Pilargidae consists of the following seven genera : Ancistrosyllis Mc Intosh, Cabira Webster, Loandalia Monro, Otopsis Ditlevsen, Pilargis St. Joseph, Talehsapia Fauvel and Ancistargis Jones. However, Hartman (1947) has suggested that the genus Cabira, which is represented by only one species, might best be dropped from literature. Kitamori (I960) has described Pilargis matsunagaensis (= Ancistargis matsunagaensis), a new species from Matsunaga Bay, Hiroshima Prefecture, which combines the characters of both the genera Ancistrosyllis and Pilargis. It has a pair of antennae in the prostomium and the epitheUal papillae are scattered over most of the body. In addition, it has an acicular hook in notopodia, a character typical of the genus Ancistrosyllis. As pointed out by Jones (1961) P. matsunagaensis should belong to the genus Ancistargis. At present this genus is represented by two species, papillosus and matsunagaen

Radio continuum and far-infrared emission of spiral galaxies: Implications of correlations

Researchers present a study extending the correlation seen between radio continuum and far-infrared emissions from spiral galaxies to a lower frequency of 408 MHz and also as a function of radio spectral index. The tight correlation seen between the two luminosities is then used to constrain several parameters governing the emissions such as the changes in star formation rate and mass function, frequency of supernovae that are parents of the interstellar electrons and factors governing synchrotron radio emission

Maturity and spawning of the snapper, Lutianus kasmira (Forskal) from the Andaman sea

Lutianus kasmira of the Andaman Sea spawns only once in a year but the spawning period is likely to be spread over a period of four or five months from November to March. The occurrence of mature fish over a prolonged period and high gonadosomatic index during a number of months lend additional evidence for the prolonged spawning season of the fish. The minimum size at first maturity was about 170 mm and fifty per cent maturity was attained when the fish grew to a length of 200 mm. Fecundity was found to fluctuate very widely from 42,100 to 332,620. The sexes were found to be disproportionate in the catches, the males outnumbering the females, which suggests that differential fishing could occur in Lutianus kasmira

On the occurrence of Malacanthus hoedtii Bleeker (Fam: Malacanthidae) in the Andaman sea.

The occurrence of Malacanthus hoedtii Bleeker is reported for the first time from the Andaman Sea. The various body measurements of M. hoedtii are compared with those of M. latovittatus and the range of distribution of the two species in the tropical Indo-Pacific Ocean is discussed

Criteria for site selection for mussel farms

In recent years considerable progress has been made in cultivating mussels in India. Mussel culture forms an important programme in the mariculture activities of countries like F:cance, Spain, Italy, Neilherlands and North -America. Hany countries in Asia like Singapore, Philippines, Thailand, Indonesia, etc., have also taken up mussel culture in recent years in view of its high production potentia

A new approach for finding out the bioaccumulation rate of heavy metals in tissues of Liza parsia

Through field and laboratory studies, a concept has been developed for finding out the differential rate of bioaccumulation of some heavy metals such as copper, zinc and lead in different tissues of mullet" Liza parsia (Hamilton-Buchanan). This new approach for finding out the maximum bioaccumulatiol1 employed a series of experiments, statistical and graphical interpretations and has put forth a concept for future investigations with different bio-accumulative toxicants

Summary of the proceedings of the National workshop on Beche-de-mer

PROCEEDINGS OF THE NATIONAL WORKSHOP ON BECHE-DE-MER PRESIDENTIAL ADDRESS BY DR. P. S. B. R. JAMES INAUGURAL ADDRESS BY SHRI. M. R. NAIR KEYNOTE ADDRESS BY SHRI K SACHITHANANTHAN NATIONAL WORKSHOP ON BECHE-DE-MER MANDAPAM CAMP • 2 3 - 2 6 February 1989 RECOMMENDATION

Static bioassay with Liza parsia exposed to Copper Sulphate, Zinc Sulphate and Lead Nitrate

Short-term static bioassays were conducted on the brackishwater mullet, Liza parsia to determine the combined effect of copper sulphate, zinc sulphate and lead nitrate in the ratio 1:1:1. From probit analyses the LCso values for 12, 24, 72 and 96 hours were found to be 160.5, 152.2, 135.6, 117.1 and 106.7 ppm, respectively. The toxicities of these elements were found to be "additive" in nature

Manual on bioassays in the laboratory and their techniques

Though many reports are available on the techniques of bioassays, interpretation of results, etc. in most of the cases it is doubtful whether the bioassays have been conducted with standard procedures. The authors of this Special Publication have carried out bioassays following standard techniques and the results are included in the Ph. D. thesis of the first author and approved for the award of the Ph. D. degree by the Cochin University of Science and Technology. These results have been given as examples in this manual. This manual with its comprehensive expressions, definitions and techniques, will be of great use as a practical guide to the researchers, students and planners for conducting bioassays systematically, and interpreting the results. It also reviews most of the available reports on this important subjec

Heavy metal toxicity in the estuarine, coastal and marine ecosystems of India

The term "metal" designates an element which is good conductor of electricity and whose electric resistance is directly proportional to the absolute temperature (Wittmann, 1979). In addition to this distinctive characteristic, metals share several other typical physical properties such as high thermal conductivity, high density, malleability and ductility. Several non-metallic elements exhibit one or more of these properties, so that the only feature that defines a metal unambiguously is the electric conductivity which decreases with increasing temperature. Within a given period the properties of the elements vary gradually from a high electropositive (metallic) character at the left-hand side of the series to the highly electronegative (nonmetallic) character at the end of the series. The "metalloids" (or half metals) such as boron, silicon, germanium, arsenic and tellurium are balanced in the Periodic Table between metals and non-metal