సముద్రములో చేపల సాగుకు అవసరమైన మూరింగుకు యాంత్రిక పరిజ్ఞ్యానం (Engineering aspects of mooring for offshore cage farming of finfishes)

Cage culture has been demonstrated as a suitable tool to enhance marine fish production in coastal areas by Central Marine Fisheries Research Institute in recent years. Cage farming fully depends on the cage stability in the sea considering the rough weather conditions throughout the seasons which differs from place to place. The design and installation of offshore cage needs basic understanding on their behavior in actual sea conditions. As a cage system operates in open sea, it is subjected to currents, waves and winds. The mooring and anchoring system helps to keep the cage in sea against drifting

Bacterial diversity in organic manured fish ponds

Eleven bacterial species isolated from water and sediment media from organic manured carp cultured ponds with cow manure and biogas slurry comprised diverse bacterial strains of Methylococcus, Pseudomonas, Aquaspirillum, Bacillus, Planococcus, Micrococcus, Streptococcus, Lactobacillus, Listeria, Sporosarcina and Sporolactobacillus. Bacillus sp. (44.1%) along with other gram-positive forms like Planococcus sp. (14.3%) and Micrococcus sp. (10.7%) were the important microbial groups and their occurrence may be attributed to allochthonous organic enrichment and active sediment-water nutrient interactions

Sustainable Composting of Aquatic Weeds and Animal Excreta for Utilization in Aquaculture

Sustainable Composting of Aquatic Weeds and Animal Excreta for Utilization in Aquacultur

Localization of Phase Spectrum Using Modified Continuous Wavelet Transform

ABSTRACT: In recent years, there has been an increasing interest with respect to using a set of orthonormal bases of wavelets for multiresolution approximation of a function . This Paper presents a new transform for detection of phase change using the analysis functions which are obtained by dilation of a spline window and is frequency dependent. This paper also enables the present transform to "zoom in" on singularities and makes it very attractive for the analysis of non-stationary signals and the other advantage of this technique is that spline functions are more localized than the Gaussian function which is used in WFT

मीठा पानी जलजीव पालन के लिए संभावि त जैवि क और अजैवि क निवेश

भारत में मीठा पानी मछली पालन प्रणालियों में अंडजनन , पोन ा मछली (fry) और अंगुलिमीनों (fingerling) के पालन हेतु मछली तालाबों में उर्वरता बढ़ान े के लिए पारंपरिक रूप से जैवि क और अजैवि क अपशिष्टों का उपयोग कि या जाता है। सामान्य तौर पर उपयोग कि ए जाने वाले जैवि क संसाधनों में पशु स्रोतों से प्राप्त गोबर, बायोगैस घोल, डेयरी अपशिष्ट, मुर्गी , बकरी, सुअर, बतख आदि के वि सर्ज्य और घरेलू अपशिष्ट सम्मिलित हैं

Overview of dry fish landings and trade at Visakhapatnam Fishing Harbour

Fish drying is an age old practice and was adopted as a practical method of preserving fish that have not been immediately consumed or sold in the fresh market. Improved fishing techniques and infrastructure resulted in increased fish catch, better marketing, processing and curing facilities. The advent of multiday trawling at the Visakhapatnam Fishing Harbour further boosted the availability of fish and its processing into value added products. However, drying still remains the cheapest and popular mode of fish preservation

टिकाऊ जलजीव पालन के लिए सूक्ष्मजीव जैव उर्वरक

मीठा पानी तालाब में मछली पालन के दौरान रासायनि क उर्वरकों की बढ़ती लागत और जलीय पारिस्थितिक तंत्रों में वि कृ तीकरण की प्रक्रिया द्वारा मिट्टी और पानी से नाइट्रजन के लगातार नुकसान के संदर्भ में जैव उर्वरक के अनुप्रयोग का काफी महत्व है। रासायनि क उर्वरकों का नि रंतर अनुप्रयोग तलछट स्वास्थ्य को प्रभावि त करता है और जैवि क खादों और जैव उर्वरक मीठे पानी के जलीय कृ षि के स्थायी अनुप्रयोग के लिए सि फारिश की जाती है। जलीय प्रणालियों म ें उत्पादन प्रक्रियाओ ं के लिए नाइट्रजन एक आवश्यक आधारभूत तत्व है। वैश्विक आधार पर, जैवि क और रासायनि क नाइट्रजन स्थिरीकरण दर क्रमशः 9.1 और 2.1 x 1010 कि .ग्रा. है और नाइट्रजन एक निष् ्रिय तत्व है और जब तक कम नहीं कि या जाता है तब तक इसका उपयोग बायोटा द्वारा नहीं कि या जा सकता है

Gene network analysis of poplar root transcriptome in response to drought stress identifies a PtaJAZ3PtaRAP2.6-centered hierarchical network

Using time-series transcriptomic data from poplar roots undergoing polyethylene glycol (PEG)-induced drought stress, we built a genetic network model of the involved putative molecular responses. We found that the network resembled a hierarchical structure. The highest hierarchical level in this structure is occupied by 9 genes, which we called superhubs because they were primarily connected to 18 hub genes, which are then connected to 2,934 terminal genes. We were only able to regenerate transgenic plants overexpressing two of the superhubs, suggesting that the majority of the superhubs might interfere with the regeneration process and did not allow recovery of transgenic plants. The two superhubs encode proteins with closest homology to JAZ3 and RAP2.6 genes of Arabidopsis and were consequently named PtaJAZ3 and PtaRAP2.6. PtaJAZ3 and PtaRAP2.6 overexpressing transgenic lines showed a significant increase in both root elongation and lateral root proliferation and these responses were specific for the drought stress conditions and were highly correlated with the levels of overexpression of the transgenes. Several lines of evidence suggest of regulatory interactions between the two superhubs. Both superhubs were significantly induced by methyl jasmonate (MeJA). Because jasmonate signaling involves ubiquitin-mediated proteasome degradation, treatment with proteasome inhibitor abolished the MeJA induction for both genes. PtaRAP2.6 was upregulated in PtaJAZ3 transgenics but PtaJAZ3 expression was not affected in the PtaRAP2.6 overexpressors. The discovery of the two genes and further future insights into the associated mechanisms can lead to improved understanding and novel approaches to regulate root architecture in relation to drought stress

Plankton Dynamics in Freshwater Fish Ponds in India

Plankton Dynamics in Freshwater Fish Ponds in Indi

Periphyton communities in carp culture ponds treated with cow manure and biogas slurry

The mean periphyton counts in the surface and subsurface waters of the fish ponds with applications of cow manure at 10 t/ha/yr; urea at 100 kg N/ha/yr and single super phosphate at 50 kg P/ha/yr in the first treatment; biogas slurry at 15 t/ha/yr and inorganic fertilizers as in the previous treatment in the second treatment; biogas slurry at 30 t/ha/yr in the third and biogas slurry at 30 t/ha/yr with supplementary feed were 333, 365, 407, 433/cm2/day and 230, 284, 348, 377/cm2/day, respectively. Higher counts were observed in treatment 4, followed by treatments 3, 2 and 1 showing significant differences with higher counts in the surface waters. The species diversity indices were more in the third and fourth treatments with higher diversity at the surface levels. The dominance of Bacillariophyceae in the surface waters was distinct (45.9–60.6%) attributing to the higher nutrient availability on mineralization of the easily decomposable substrate. Water quality parameters in all the four treatments were in the normal ranges. The representations of both Bacillariophyceae and Chlorophyceae were similar in the subsurface waters (36.6–50.8% and 28.2–36.4%). There was increase in the percentage composition of protozoans in the surface waters in the slurry-applied ponds (0.6–3.3%). Variations in rotifers were moderate, the respective representation ranges being 0.9–3.4%, 2.2–5.3% in the two levels and cladocerans in subsurface waters were higher with means of 10.7, 4.3, 4.9 and 4.7. Copepods were the dominant group in the animal assemblages at the surface level with the means of 3.0%, 2.3%, 4.0% and 5.0%. The variations in the different groups presented a vertical distribution pattern in the colonization of the periphytic communities