आन्ध्रा प्रदेश की समुद्री मात्स्यिकी और टिकाऊ प्रबंधन

कृपया पूरा लेखा पढ

Quantitative genetic tools for brood stock improvement

Success in aquaculture and fisheries management depends on viable concept, sound management and animals with high genetic potential. In farm animals and plants application of genetic principles and genetiC tools lead to increased production in accordance with the demands of the nation. Breeding programmes like selective breeding and cross breeding played an important role in increased productivity, domestication and survival rate. Genetics in fisheries is relatively ne

Ornamental fish - prospects for culture

In 1978 work was initiated to culture the -blood clam Anadara granosa in the Bay. A 100 m2 area was selected, an elderly clam fisherman from the village was entrusted with the watch and ward. Wide publicity was given in the village to create awareness. In the evening, the site was fenced with dry palmyra leaves (to serve as pen enclosure). Nylon netting was not preferred due to possible poachin

Fishery and some aspects of population dynamics of goatfish Upeneus vittatus (Forskal) off Visakhapatnam

The average annual estimated catch of goatfishes at Visakhapatnam was 1,511 t during1997-03, which formed 7.4 % of the total landings of small-mechanized units including small trawlers and Sona boats. Upeneus vittatus was the dominant species. The fish attained maturity at 138 mm length. The spawning period extended from July to October. The growth parameters of this species were L _ = 245 mm, K = 0.67 yr-' and to = - 0.146. The mortality rates Z, F and M were 5.49,4.06 and 1.43, respectively. The exploitation rate is estimated to be 0.74, indicating overexploitation of the stock

Fishery and population dynamics of silverbellies off Visakhapatnam

The annual average catch of silverbellies was 453 t in small-mechanized boats operating off Visakhapatnam during 1990-2001. Silverbellies contributed 4.2 % to the total landings. Maximum landings were during April-June. Ten species of silverbellies were recorded of which Leiognathus bindus (51%) was the dominant species. The growth parameters, Lm and K for L bindus and Secutor insidiator were 148 mm & 0.88 yr-' and 140 mm & 0.96 yr-', respectively. Theestimated mortality rates, Z, M and F were 6.36, 1.97 and 4.39 for L bindus and 6.03, 2.12 and 3.91 for S. insidiator. The exploitation rates for the species were 0.69 and 0.65 respectivel

Marine Fisheries of Andhra Pradesh-An Appraisal

Andhra Pradesh with a long coastline of 974 km and a continental shelf area of 33,227 km2 is spread over nine districts (Fig.1) and supports a rich fishery constituted by several groups of fishes, crustaceans, molluscs and other marine organisms. In the marine fisheries sector, Andhra Pradesh has always been known for its healthy fishing grounds, diverse resources, variety of crafts and gears, high entrepreneurship and adaptability to new technologies in exploiting the available resources and the sector contributes significantly to the employment generation in the state

Genetic variation and genetic diversity in chicken populations using microsatellite assay

Microsatellites are one of the recent markers widely used in gene marker studies, as they are abundant, co-~ominant, highly polymorphic and dispersed throughout the genome. Microsatellites are identified as reliable markers in chicken.(Romanov and Weigend 2001). Birds (212) representing 8 populations were utilized in the present study. Blood samples were collected from the Wbite Leghorn layer parent strains (WLH-IWD and WLHIWF) from AICRP on Poultry Breeding, Rajendranagar, the Babcock and the Vencobb commercial birds maintained at the Department of Poultry Science, College of Veterinary Science, Hyderabad, the Aseel from the backyards of farmers of West Godavari and Srikakukam districts and non-descript (desi) birds from adjoining areas of Rajendranagar. Three di-nucleotide microsatellite markers chosen randomly from the list recommended by the FAO (Cheng et al. 1995) and mapped either in Compton or East Lansing reference populations were genotyped. Blood samples (0.5-2.0 mVbird) were coUected into the vacutainers containing EDTA (5.4 mg) from the wing vein

On-Board Oxygen Generation Using High Performance Molecular Sieve

The majority of high performance combat aircrafts presently being operated by Indian air Force are fitted with conventional oxygen systems in which a replenishable store of oxygen is carried, most often as liquid oxygen and the flow of gas to each crew member is controlled by an individual pressure demand regulator in which the oxygen is diluted with cabin air to provide breathing gas.Moreover, in-flight refueling capability of present generation fighter aircraft has made it possible to fly for long durations (6 to 8 hours). In such case, the oxygen source becomes one of the limiting factors. In order to meet this requirement, a large supply of Gaseous Oxygen (GASOX) or Liquid Oxygen (LOX) have proven to be a costly affair and the Onboard Oxygen Generating System (OBOGS) has become a very convenient and attractive proposal. The OBOGS employs molecular sieves to adsorb nitrogen from engine bleed air using pressure swing adsorption (PSA) technique, wherein two molecular sieve beds are continuously cycled between steps of pressurization (adsorption) and depressurization (desorption) to generate oxygen enriched breathing gas for aircrew. This paper describes the design of OBOGS using high performance Lithium based Low Silica X-type (Li-LSX) molecular sieves and its performance characteristics. It consists of two Zeolite beds filled with Li-LSX material which adsorbs nitrogen fromengine bleed air tapped from Environmental Control System pipe line. The two beds are cycled by a 5/2 way solenoid valve. The input air is supplied to the solenoid valve through a coalescent filter to reduce moisture from it and a pressure regulator is fitted at the upstream of solenoid valve to regulate the system pressure. The experimental setup for evaluation of OBOGS is also discussed. The OBOGS, presented in this paper, meets all the performance requirements as specified in MIL-C-85521 (AS).

Selective Breeding and Development of Disease Resistant Broodstock of Black Tiger Shrimp Penaeus monodon Fabricius, 1798

The Indian tiger shrimp Penaeus monodon is the principal species being cultured. Of late hatchery sector is being dependent on wild gravid females due to non response of broodstock to eyestalk ablation. High cost of gravid females compelling the grow-out sector to stock pathogen carrier seeds. Hence domestication of tiger shrimp is essential to produce Specific Pathogen Free (SPF) broodstock / Disease Resistant (DR) broodstock. Merits and demerits of SPF versus DR broodstock are presented. Development of SPF broodstock involves stringent management of environment to arrest the entry of pathogens and more than one economic trait can be selected. Whereas in development of DR broodstockanimals are challenged with the pathogen and a selection of other economic traits are less possible. Resistance in shrimp exists at the species level as well as individual level. Experiment on domestication of P. monodon in which programme was advanced up to F3 generation has revealed the existence of resistance for WSSV at the individual level. Selective breeding programme for development of D R broodstock involves development of disease free base population, forming them into families, production of F1 generation family wise through inbreeding, challenging each family with WSSV at 3-5 g size and rearing survived individuals up to 100 g size, production of F2 generation by random inter crossing between families, advancing the programme up to F5 generation. Development of DR broodstock is imperative to ensure sustainable shrimp productio