Problems of diseases on marine fish and prawn farming in India

The problems of diseases are of great concern to the fish cultivators and research workers. The disease in severe cases inflicts heavy losses on the fish crop by reducing the yield. Information regarding its identification nature, extent of damage and controi measures etc, is being briefly summarised in this article

Evaluation of a simple tagging method to monitor the growth of endangered species of seahorse

Identification of an individual seahorse is important for captive breeding and conservation studies. A simple and cost-effective tagging method was devised to suit the rigid body structure and small fins of Hippocampus kuda. The first generation sexually matured individuals (452 numbers) were tagged using plastic strips tied around the neck. No significant differences (P > 0.05) in growth between the tagged and untagged groups were noted. All the tags persisted for one year without any perceptible changes in sexual and social behaviour

Species-specific proteins in closely-related seahorses

Non-denatured polyacrylanlide gel shows the respective species-specific characteristics on the muscle protein of' Hippocampus kuda and N. trirnacrtiahs. Two proteins; of molecular weight 66.8 and 39.8 kDa were found exclusively in 11. kuda. These constituted about 69.8 and 16.2% respectively of its protein. In M. trintucuirtus, two other specific proteins with molecular weight of 674.3 and 50.5 kDa were recorded, which constituted 46.0 and 7.5% respectively of its protein. These species-specific proteins are important for species identification, which paves avenues for further characterization and upgrading of the available information on seahorse taxonomy

On Contra gy-Continuous Functions

In this paper, we investigate further properties of the notion of contra gy-continuous functions which was introduced in [4]. We obtain some separation axioms of contra gy-continuous functions and discuss the relationships between contra gy-continuity and other related functions

Formation and Acceleration of Uniformly-Filled Ellipsoidal Electron Bunches Obtained via Space-Charge-Driven Expansion from a Cesium-Telluride Photocathode

We report the experimental generation, acceleration and characterization of a uniformly-filled electron bunch obtained via space-charge-driven expansion (often referred to as "blow-out regime") in an L-band (1.3-GHz) radiofrequency photoinjector. The beam is photoemitted from a Cesium-Telluride semiconductor photocathode using a short ($<200$ fs) ultraviolet laser pulse. The produced electron bunches are characterized with conventional diagnostics and the signatures of their ellipsoidal character is observed. We especially demonstrate the production of ellipsoidal bunches with charges up to $\sim0.5$ nC corresponding to a $\sim20$-fold increase compared to previous experiments with metallic photocathodes.Comment: 9, pages, 13 figure