Supplementary feeding in aquaculture

Farming of fish scientifically requires adequate basic knowledge regarding stocking of fingerlings and providing them with requisite environment and feeding. In order to achieve production at a viable level certain fundamental aspects of fish nutrition and on-farm fish feed production should be followed

Marine fish nutrition, feed formulation, feed production and feeding

Feeding rates, feeding frequency and time of feeding are all important factors to be considered in feeding of the fish. As a general rule of the thumb most of the vertebrates including fish consume 2.5 to 3.0% of the body weight in dry matter. Feeding rates and frequencies are related to fish growth. Small larval fish and fry need to be fed a high protein diet frequently and usually in excess. When fishes grow bigger, feeding rates and frequencies should be lowered. Feeding fish is a labour intensive activity and feeding frequency has to be programmed in such a way that it is economically viable

Blending of ingredients in aquafeed formulation the 'Excel' way Tips to farmers/farm managers

Feed formulation is a technique to be learnt and refined by experience. To date numerous descriptions have appeared on the topic in nutrition textbooks. The exercise, even when taught over and over again, is difficult to cornprehend especially by the beginners

Nutritional requirements of broodstock, larvae and juveniles of finfish- Winter School on Recent Advances in Breeding and Larviculture of Marine Finfish and Shellfish

Finfish culture in India is prominent only in the fresh water aquaculture. In the marine and brackishwater sectors only asian seabass (Lates calcarifer) has met with success. Farming of this fish on a commercial scale is still not a reality in India. Technological gaps, and low rate of return when compared with shrimp culture. In this backdrop, the purpose of this article is to review the status of knowledge regarding the nutritional requirements of marine finfish broodstock, larvae and juveniles

Flux profile modeling using Monte Carlo simulation

Molecular beam Epitaxy (MBE) is a process by which semiconductor films are grown on the substrate by physical vapor deposition of the source material in an ultra high vacuum environment. Spatial variations in flux are a result of the shape of the crucible and the geometry of the growth chamber. In this study a process simulation tool for MBE based on a phenomenological model is proposed and elaborated; Two different models based on physical principles are investigated. Model I includes the primary flux from the liquid surface and a secondary flux re-emitted from the crucible walls for the total flux at the platen. No intermolecular collisions are considered in this model. Since the investigated 10000g SUMO crucible has a tapered region leading to the crucible opening (smallest radii opening), molecules undergo extensive interwall and intermolecular collisions in that region. Simulation of intermolecular collisions requires considerable time and limits the usage of the modeling tool in the industry. Thus, the effect of intermolecular collisions is captured through the assumption of a virtual flux source (VFS) at the neck in model II. For the two models, the simulation is performed using the Monte Carlo approach. The results of model II obtained from using cos2theta distribution from the VFS, best describes the experimental data for the SUMO 10000g crucible; Thus the tool is capable of simulating flux effusion for different crucibles and geometries once the nature of distribution from the crucible is established. The accurate description of the distribution can be obtained by changing the distribution parameter and comparing the generated profiles with experimental results. (Abstract shortened by UMI.)

A preliminary study of the effect of mantis shrimp as an ingredient in Penaeus indicus postlarval diets

The apparent digestibility (Da) of five diets, incorporated with mantis shrimp at levels of to, 15, 20, 25 and 30% was determined for Penaeus indicus postlarvae (initial weight ranging from 0.087-0.106 g). Oa for crude protein ranged from 61.97 to 92.76% showing a significant increase with increase in the level of mantis shrimp upto 25% in the diet and was higher than the control value of 66.09 (P > 0.05). Crude fat digestibility ranged from 52.26 to 89.57% also showing an increase upto 25% incorporation of mantis shrimp

മത്സ്യപോഷണവും തീററയുല്പാദനവും (Fish nutrition and feed production)

Man began to think of fish culture when he realised that the oceans and other waterbodies could not provide sufficient fish to meet the demand of increasing population. This led to the beginning of studies on the reproduction and nutritional requirements of different species of fish. Fish that grow in natural waters get their food from their environment. They move in the sea, lake or river in search of food and favourable conditions for growth and reproduction. When fish are stocked in ponds and farms they have to get additional supply of nutrients fi*om external sources

Nutraceutical products from seaweeds - wonder herbs of the oceans

Seaweeds encompassing several species are common in the coastal areas of Indian subcontinent, and can be termed as the wonder herbs of the ocean due to their potential pharmaceutical properties. Marine-based resources are drawing the attention of nutraceutical industries due to their protective function against various chronic diseases and the growing demand for new compounds of ‘marine natural’ origin. Considering this, ICAR-Central Marine Fisheries Research Institute developed research program to systematically search identified seaweed species for the development of promising bioactive molecules. The nutraceutical products CadalminTM Green Algal extract and CadalminTM Antidiabetic extract as green alternatives to synthetic drugs to combat rheumatic arthritic pains and type-2 diabetes, respectively were developed. Following this, CadalminTM Antihypercholesterolemic extract and CadalminTM Antihypothyroidism extract to combat dyslipidemia and hypothyroid disorder, respectively were also developed. The lead molecules with action against angiotensin converting enzyme-I, from seaweeds were also isolated, and added to a nutraceutical product CadalminTM Antihypertensive extract that is being out-licensed