Marine fish calendar. V. Kakinada

The current article provides the marine fish landing data of various gears at Kakinada landing centre, Andhrapradesh. Data of the period I98l-'85 from the trawlers and 1980-'82 from indigenous gear and published information on different species from Kakinada are used for the present fish calendar

Seaweed resources of the Tuticorin-Tiruchendur coast, Tamil Nadu, India

The southern coast of Tamil Nadu (Mandapam to Kanyakumari) supports luxuriant growth of economic seaweeds. The entire indigenous phycocoUoid industry of the country gets the raw material from this region and during the last two decades, due to indiscriminate harvesting, there has been over-exploitation of the resource. The present paper deals with survey conducted in the first sector from Tuticorin to Tiruchendur during December 1986—March 1987. In this study 58 species of marine algae were recorded of which 7 belong to Chlorophyta, 12 to Phaeophyta and 39 to Rhodophyta besides 3 species of seagrasses namely Cymodocea seiriilata, Halophila ovalis and //. ovata within 650 sq. km area surveyed. The total standing crop of the seaweeds was estimated at 9,100 tonnes (wt.). The estimates for the dominant species are Dictyota maxima 530 t, Sargassum tenerrium 640 t, D. bartayresiana 8601, Selieria rebusta 2,0901 and Hypnea valemiae 2,4301. The seaweed potential for commercial exploitation has been briefly discussed

Gamma, X-ray and neutron shielding properties of boron polymers

271-276We have studied the X-ray and gamma radiation shielding parameters such as mass attenuation coefficient, linear attenuation coefficient, Half Value Layer (HVL), Tenth Value Layer (TVL), effective atomic number and electron density in some boron polymers of different boron based polymers [ Polymer A-PolyBorazylene (B3N3H4), Polymer B- 4-Vinylphenyl Boronic acid (C8H9O2B), Polymer C- Borazine (B3N3H6), Polymer D- 3-Acrylamidophenylboronic acid (C9H10BNO3) Polymer E-Phenylethenylboronic acid (C14H19BO2), Polymer F- 4-Aminophenylboronic acid (C12H18BNO2) and Polymer G- 3- Aminophenylboronic acid (C6H8BNO2)]. We have also studied the neutron shielding properties such as coherent neutron scattering length, incoherent neutron scattering lengths, coherent neutron scattering cross section, incoherent neutron scattering cross sections, total neutron scattering cross section and neutron absorption cross sections in the boron polymers. We have compared the shielding properties among the studied different boron polymers. From the detail study, it is clear that the boron polymer Phenylethenylboronic acid is good absorber for X-ray, gamma radiation and neutron. Hence, we suggest that the boron polymer Phenylethenylboronic acid is good shielding material for X-ray, gamma and neutrons

Seaweed resources off Tamil Nadu coast: Sector II. Alanthali - Manapad and Vembar – Nallathanni Thivu

The seaweeds are used for the production of polysaccharides such as agar, algin, carragennan and they are harvested from intertidal regions along the southeast shores of India. The resource potential from intertidal regions was estimated (Anon 1978

Occurrence and growth of the commercially important red algae in fish culture pond at Mandapam

The red algae Gracilaria edulis, Hypnea valenliae, Acanthophora spicifera ard Sarconema irdica have been observed to occur arrl grow in a culture pard. Ove- a period of eight month s, the algae grew to lJ4 kg in the pard of 800 sq m. The hyd rological cordilions in the porn are compared to those in the sea containing natursl beds of these algae during the periro of observations. This occurrence ard growth may open up the ,,4. possibility of growing these algae in culture pards providing the requisite hyd rological ard nutrient corditions

Distribution of sea weeds off Kattapadu - Tiruchendur coast, Tamil nadu

The present paper deals with the distribution of seaweeds and seagrasses during the deep sea survey conducted in the first sector from Kattapadu to Tiruchendur in Tamil Nadu coast between December 1986 and March 1987 covering an area of 650 sq.km. In thiS survey. 58 species of marine algae \\ere recorded. of which 7 belong to Chlorophyta. 12 to Phaeophyta and 39 to Rhodophyta. Three species of seagrasses vi z. Cymodocea serrl/lata. Halophila ovails and H. ovala were also recorded at the depths ranging from 5.5 to 21.5 III Halim eda macroloba, D,ClyOIO barlayresiana, D. Maxima, Gracliaria corl/cala var. corlicala, G. edulis, Sarcodia indica, Sarconema filiform e, Soliena rob"sla, flypnea esperi and H. "alenliae were found to be dominant and widely distributed. Hydrological data were also collected from area surveyed. The atmospheric and bottom water temperature varied from 25.0 to 36.8'C and 26.0 to 31.8'C respectively. The pH ranged from 8.3 to 8.6 and the salinity from 26.39 to 33.430/00 . The dissolved oxygen ranged from 3A2 to 6.47 mill. The phosphate content varied from 0.05 to 0. 15 I'g atm/ l, silicate from 4.00 to 12.00 I'g atmll, nitrate from 0.25 to 1.00 I'g at mil and nitrite from 1.05 to 3.99 I'g atml l

Seaweeds

Research works oti various aspects of seaweeds have been caried out since last five decades. They inchide resources survey, studies on distribution, Uixonomy, ecology, biology, phycocolioids, biochemicals, culture and utilisation of marine algae growing in Tamil Nadu, Kercda, Lakshadwe^p and Andaman-Nicobar Islands. Information was also gathered since 1978 on the quantity of seaweeds commercially exploited from the natural seaweed beds occurring in Tamil Nadu coast. The results obtained on these aspects are reviewed in this paper. The prospects of seaweed research, industry and utilisation in India are also briefly described

Prawn seed exploitation along Kakinada coast : a preliminary appraisal with a note on the brooder exploitation of Penaeus monodon

In recent times there is a steep increase in the exploitation of prawn seed in order to cater to the needs of prawn fanners along the Andhra Pradesh coast. There is demand mostly for seed P. monodon by the prawn farmers of this state. There are no official or reliable estimates of the total extent of prawn farms in Andhra Pradesh

Seaweed resources off Tamil Nadu coast: Sector III. Valinokkam - Kilakkarai

Survey of seaweed resources in deep water was carried out in the area between Valinokkam and Kilakkarai during January 1989 and March,l990 respectively. In the survey from Valinokkam to Kilakkarai 33 species of marine algae were recorded of which 8 species belong to Chlorophyta, 8 to Phaeophyta and 17 to Rhodophyta. Only one species of seagrass Halophila ovalis was recorded. Among the 200 sq Icm area surveyed, vegetation occurred only in 27.5 sq.km with a total standing crop of 2962.5 tonnes (wet wt)