Studies on Ostracods of the Indian Seas

An account of the past five decades of research carried out on ostracods by the staff of the Central Marine Fisheries Research Institute and most relevant works carried out by others on the topic from the Indian seas are presented. This is a review of the major work done especially the distribution and abundance in space and time along with, descriptions of species in the inshore as well as in the oceanic regions of the Indian sea

The rotifer Brachionus rotundiformis Tschungunoff isolated from Cochin backwater, Kerala.

The rotifer, Brachionus rotundformis along with a smaller strain were isolated for the first time from Cochin backwater. The newly isolated B, rotundformis has a length range of 98-210 microns showing a modal size of 168 microns, while in the smaller strain the length ranged from 70-168 microns with modal size at 140 microns. The lorica width to length ratio for B. rotundiformis is 0.7 and that for smaller strain 0.8. The smaller strains are of much use for feeding fish larvae especially those having small mouth size

New records of two finfish species from Indian waters

Two species of fishes, namely Ablabys binotatus (Family Tetrarogidae) and Rhinopias eschmeyeri (Family Scorpaenidae) were recorded in trawl (Roller madi) landings from the Gulf of Mannar, south-east of India, which are the first reports from India

मान्नार की खाडी में दक्षिण-पूर्व भारत तट की पादपप्लवक संपदाएं

कृपया पूरा लेखा पढ

Studies on taxonomy, distribution, ecology and reproductive potential of rotifers from selected centres in Cochin backwater system, Kerala

The studies were conducted in nine stations with varying ecological characteristics along Cochin backwaters and adjoining canals. Many workers opined that the distribution of rotifers is cosmopolitan. The significance of rotifers as first food for early larvae was indicated by Fujita. Aquaculture is a fast growing field in fisheries sector and it is gaining more importance as the fish landings and supply are getting irregular. A consistent supply of fish/shellfish can only be achieved through aquaculture. The success of any culture activity depends on the timely production of seeds of finfishes/shellfishes. The availability of wild seed is seasonal and erratic. So, a dependable source of seed of fishes and shellfishes is possible only through large scale production in hatchery. A successful seed production activity depends on the availability of a variety of suitable live feed organisms in sufficient quantities at the proper time for use in the larval stages. As the live feeds promote high growth rates, easy digestion, assimilation and the quality of not contaminating the culture water when compared to other artificial feeds, make the culture of live feed organisms the principal means of providing food for the larvae of finfishes and shellfishes. Rotifers are considered to be an excellent and indispensable food for larvae of many finfishes and crustaceans. It (1960) was the first to culture Brachionus plicatilis for feeding marine fish larvae, and now it is being extensively used as live feed in hatcheries all over the world. They are a group of microscopic organisms coming under the Phylum Rotifera which comprises of about 2000 species. Their slow swimming habits, ability to tolerate a wide range of salinities, parthenogenetic mode of reproduction and ability to get enriched easily, make rotifers an ideal live feed organism. The major factors such as temperature, salinity and food that influence the reproductive potential and thereby the population size of rotifer, Salinity is one of the most important aspect influencing the reproductive rate of rotifers. The feed type and feed concentration play a vital role in influencing the reproductive rate of rotifers. For culture of rotifers, the commonly used micro algae belong to Chlorella, Nannochloropsis, Isochrysis and Tetraselmis. While some studies have suggested that, algal diet has little effect on reproductive rates in 1979 while using the rotifer, Brachionus plicatilis as feed for the larvae of red sea bream, Pagrus major. It is generally accepted that rotifers play a pivotal role in the successful rearing of marine fish larvae