Keshavanath Perar

Keshavanath Perar
Karnataka Veterinary Animal and Fisheries Sciences University · Department of Aquaculture

Ph.D.

About

145
Publications
20,640
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
2,050
Citations
Introduction
Keshavanath Perar worked at the Department of Aquaculture, Karnataka Veterinary Animal and Fisheries Sciences University. His research interests include aquaculture nutrition and fish breeding.
Additional affiliations
February 2013 - August 2013
Kerala University of Fisheries and Ocean Studies
Position
  • Director of Extension
September 2007 - August 2008
Karnataka Veterinary Animal and Fisheries Sciences University
Position
  • Campus Head
April 2005 - September 2007
Karnataka Veterinary Animal and Fisheries Sciences University
Position
  • Head of Faculty
Education
- May 1975
University of Delhi
Field of study
  • Zoology
August 1967 - July 1969
University of Mysore
Field of study
  • Zoology

Publications

Publications (145)
Article
Full-text available
The influence of dietary salt (sodium chloride) on growth, feed digestibility and body composition in tambaqui (Colossoma macropomum) fingerlings was investigated, by feeding triplicate groups of fish (av, wt. 1.1 g) maintained in 500 L circular tanks with hets containing different levels of sodium chloride (0.0, 0.5, 1, 1.5 and 2%). The diets were...
Article
Two trials were conducted in mud-bottomed concrete tanks to assess the potential of using artificial substrates to enhance fish production in ponds. Three substrate types were tested: bamboo poles, PVC pipes and sugarcane bagasse bundles. In one trial, periphyton was grown on the substrates in the absence of fish. In the second trial, masheer (Tor...
Article
Full-text available
A reference diet (commercial diet with 32% protein) and a test diet (consisting of 70% reference diet and 30% of cupuacu seed cake) were used with 0.5% chromic oxide (Cr2O3) as an external marker to evaluate the digestibility of Cupuacu (Theobroma grandiflorum) seed cake, employing tambaqui (Colossoma macropomum) juveniles. Fish of average weight 8...
Article
Full-text available
The growth promoting effect of Stafac-20, a commercial growth promoting feed additive containing 2% virginiamycin, was investigated in fry of Indian major carps, catla (av. wt. 0.16+0.02 g) and rohu (av. wt. 0.14+0.01 g) separately. Stafac-20 was added at 0, 20, 40, 60, 80 and 100 ppm levels to the basal diet having 35% protein, prepared incorporat...
Article
Full-text available
Abstract Passion fruit seed cake was evaluated as a fish feed ingredient at graded levels (0,5,10,15,20%), employing jaraqui and tambaqui fingerlings. Jaraqui of av. length 3.12-3.21 cm and av. wt. 2.59-2.76 g when fed on these diets attained a final av. length of 9.80-10.51 cm and av. wt. of 22.75- 26.11g at the end of 120 days, while tambaqui of...
Article
Full-text available
Two experiments were conducted using plant substrates viz. bamboo (Bambusa vulgaris), ambay (Cecropia pachystachya) and leucaena (Leucaena leucocephala) without and with fish to evaluate their suitability for periphyton development, and influence on water quality and growth performance of jaraqui (Semaprochilodus insignis). In the first experiment...
Article
Full-text available
Low fishmeal diets (10%) with varied levels of maize (40-31%) and sardine oil (0-9%) were fed for 120 days to triplicate groups of catla (Catla catla Hamilton,1822) fingerlings (average weight 1.84-1.90 g) stocked @ 1 fish per m2 in cement tanks with soil base fertilised with poultry manure. Fish fed on diet containing 6% oil and 34% maize (T2) sho...
Article
Full-text available
The effect of a commercial feed additive ‘G-Pro’ was evaluated on growth, body composition and digestive enzyme activity of common carp, Cyprinus carpio. Fry of average weight 0.8±0.03 g stocked in 25 m3 outdoor cement tanks were fed daily on five isonitrogenous and isocaloric diets containing 0, 1, 2, 3 and 4 g G-Pro/kg diet respectively in tripli...
Article
Full-text available
Influences of two types of substrates, natural (macrophyte, Pistia stratiotes) and artificial (plastic screen) were evaluated at 3 differrent densities (10, 20, 30%) on periphyton development, water quality and growth performance of jaraqui (Semaprochilodus insignis). Fish of average initial weight 1.46-1.69 g and length 4.15-4.26 cm stocked at 1/m...
Article
Full-text available
The effect of Bioboost forte, a commercial probiotic feed additive, containing Saccharomyces cerevisiae and Bacillus coagulans, was evaluated in Macrobrachium rosenbergii (de Man 1879) through an experiment of 105 days. Bioboost forte was added at 0, 25, 50, 75 and 100 mg.kg-1 to the basal diet having 35% protein, prepared by incorporating fish mea...
Article
Full-text available
Stafac-20, a commercial growth promoting feed additive containing 2% virginiamycin, was added at 0, 20, 40, 60, 80 and 100 ppm levels to the basal diet having 35% protein, prepared incorporating fish meal, groundnut oilcake, rice bran, tapioca flour and vitamin-mineral mixture. The effect of these diets (T0, T1, T2, T3, T4 and T5) was evaluated on...
Article
Full-text available
The effect of two substrates and four fish stocking densities on the growth and production of rohu (Labeo rohita) was investigated through a 70-day 2 x 2 factorial design experiment carried out in mud-bottomed outdoor 25 m2 cement tanks. Bamboo and sugarcane bagasse were employed as substrates. Both the substrates affected (P<0.05) fish growth and...
Article
Full-text available
The effect of feed vs. feed plus two substrates, a macrophyte (Pistia stratiotes) and plastic screen, on the performance of jaraqui (Semaprochilodus insignis) and tambaqui (Colossoma macropomum) was evaluated under polyculture. Jaraqui of 14.84-18.05 g and tambaqui of 4.32-4.60 g initial average weight were stocked in triplicate at 1 fish per m 2 i...
Article
Full-text available
Five isonitrogenous and isocaloric diets were formulated incorporating ‘C-care’, containing 55% stabilized vitamin C, and fed daily for 135 days to Macrobrachium rosenbergii juveniles (av. wt. 0.7 g) stocked at the rate of 60 in 25 m3 cement tanks. The five diets T0, T1, T2, T3 and T4 were supplemented with 0, 500, 1000, 2000 and 3000 mg C-care/kg...
Article
Full-text available
This experiment of 50 days duration aimed at evaluating the growth and survival of rohu, Labeo rohita fry to dietary salt (NaCl) was carried out in six outdoor, 25 m(3) (5mx5mx1m), unfertilised cement tanks with soil base (5 cm), stocking rohu fry @ 1.5 lakh ha(-1). Powdered mixture (1:1) of rice bran and groundnut oil cake was provided in dough fo...
Article
Full-text available
Over the past 50 years, world aquaculture has grown at an average annual growth rate of 8.8% and now accounts for nearly 50% of the food fish production. Monoculure or polyculture of compatible species in ponds, providing diets with fish meal as the major protein source is the common method of farming fish. Reliance on intensive feed-driven culture...
Conference Paper
Full-text available
‘’Barrackpore Declaration for PPPs for aquaculture and culture- based fisheries’’: “The delegates, comprising researchers, private companies, nongovernmental organizations, government agencies and other participants, after having deliberated over a period of three days agreed that the integration, and promotion of public private partnership mechan...
Article
Full-text available
Provision of biodegradable substrates in culture systems results in the production of biofilm/periphyton which serves as an additional natural food source for cultured fish. The effect of sugarcane bagasse on water quality, growth performance and production of the Indian major carp, rohu (Labeo rohita) was investigated through a 180 days experiment...
Article
Full-text available
Four locally available biodegradable substrates—sugarcane (Saccharum officinales) bagasse, palm (Borasus flabellifera) leaf, coconut (Cocos nucifera) leaf, and bamboo (Bambusa bambos) mat—were evaluated for the production of periphyton and a polyculture of rohu (Labeo rohita) and common carp (Cyprinus carpio) in poultry-manured ponds. Chlorophyll-a...
Article
Full-text available
Two field experiments, each of 98-day duration, were conducted in outdoor mud- bottomed cement tanks, employing common carp (Cyprinus carpio) fry and fingerlings, with a view to study the effect of nutrient inputs (feed, manure and their combination) on different life stages of the fish. The treatments consisted of control (C), only feed (F), only...
Article
Full-text available
Background. In Indian carp culture, a 1 : 1 mixture of rice bran and oil cake is traditionally used as feed in powder form; it is nutritionally inadequate and also a large part of it goes unutilized as the fish cannot feed on the powder effectively. With a view to improve its nutritional quality and reduce the wastage, the mixture was supplemented...
Article
Full-text available
Supplying much of the required energy through carbohydrates and/or lipids helps in avoiding protein utilization as an energy source. The present study was carried out to evaluate the effect of fish meal free diets, formulated with high levels of maize and supplemented with sardine oil, on growth, carcass composition and digestive enzyme activity of...
Article
Full-text available
The effect of 2 dosages (1.5 and 3.0%) of ImmuPlus, a polyherbal immunomodulator, was tested on growth and inflammatory response to Fruend's complete adjuvant (FCA) in common carp, Cyprinus carpio. The growth study was carried out for 120 days in nine 25 m(2) outdoor cement tanks by feeding triplicate groups of 40 common carp fry (ay. wt. 0.4 +/- 0...
Article
Ten locally available substrates, five biodegradable and five non-degradable, were evaluated for their potential to harbor periphyton in cement tanks fertilized with poultry manure. The tanks were fertilized regularly and the periphyton was allowed to grow for 70 days. Weekly samples of periphyton and plankton were collected for enumeration and bio...
Article
The efficacy of the synthetic estrogen, diethylstilbestrol (DES), for sex-reversal in the Java tilapia, Oreochromis mossambicus was investigated. Fry of 8–10 mm total length were fed diets containing 25, 50 and 100 ppm of DES for 30 days in plastic pools; this was followed by 45–65 days rearing in fertilized cement cisterns where hormone-free diet...
Article
The effectiveness of pressmud, a sugarcane by-product, was tested as a manure in the production of natural food and carp, by conducting two experiments. The first experiment, of 5 weeks duration, examined the effect of pressmud addition on water quality and natural food production. This study was carried out in fibreglass tubs (1.54 m3) with a 5 cm...
Article
Full-text available
A total of 102 induced breeding trials were carried out at Harangi, Karnataka between 1993 and 1997, with a view to standardize hatchery technology for pond-raised mahseer, Tor khudree. The initial seeds for raising the broodstock were brought from Lonavla, Maharashtra in 1990 and reared in mud-bottomed masonry ponds. Male and female brood fish wer...
Article
Small (10 g) tilapia (Oreochromis niloticus) were exposed to pure and mixed populations of toxic and non-toxic strains of the cyanobacterium Microcystis aeruginosa (100% toxic, 50% toxic, 25% toxic, 0% toxic) at two particle concentrations (1 × 106 and 5 × 10sparticles ml−1). At both concentrations there was a progressive decrease in grazing rate a...
Article
Full-text available
Sugarcane bagasse (T1), paddy straw (T2) and their mixture (T3) were added to mud-bottomed, manured cement tanks in triplicate to study the effect on bacterial biofilm production and growth and survival of rohu, Labeo rohita. All tanks were stocked with fingerling rohu at 10 000 ha−1. The total plate count (TPC) of bacteria in water and on substrat...
Chapter
This book contains 18 chapters and provides an international review of periphyton ecology, exploitation and management. The ecological aspect focuses on periphyton structure and function in natural systems while the exploitation aspect covers its nutritive qualities and utilization by organisms, particularly in agriculture. The management aspect co...
Article
Full-text available
Rohu, Labeo rohita, fingerlings (av. wt. 1.6 g) were fed pelleted diets supplemented with 0,0.5,1.0,1.5 and 2.0% sodium chloride (NaCl) for 120 days in 25-m cement tanks. The final weight gain of fish fed 0.5 and 1.0% NaCl-incorporated diets was significantly (P < 0.05) higher than that of the control (0% NaCl). Net protein retention and carcass pr...
Article
Periphyton development on bamboo substrate was quantified over six weeks in fertilized mud-bottomed cement tanks. Dry matter, ash and pigment content of periphyton were analyzed at weekly intervals. On a dry matter basis, periphyton production reached the maximum on the 21st day and showed a decline thereafter. Periphyton was scraped and fed ad lib...
Article
Periphyton growing on artificial substrates can increase the production of herbivorous fish in aquaculture ponds. Periphyton may be an alternative or a complement for supplemental feed in fingerling production. Growth and production of hybrid red tilapia (Oreochromis mossambicus×Oreochromis niloticus) were evaluated in twelve 5×5×1-m3 concrete mud-...
Article
Full-text available
The effects of two substrates, sugarcane bagasse (T(1)) and paddy straw (T(2)) on water quality and growth of Labeo fimbriatus were studied in mud-bottomed, manured cement tanks, in triplicate; a set of three tanks without substrate served as control (T(3)). Addition of manure and substrate brought about a decrease in dissolved oxygen level, but it...
Article
Full-text available
In order to study the influence of sodium chloride (common salt) on growth, body composition and digestive enzyme activity of carps and prawns, we carried out four separate experiments of 120-day duration each in 25m3 (5x5x1m) outdoor cement tanks without soil base. We used the commonly cultured species-rohu (Labeo rohita), mrigal (Cirrhinus mrigai...
Article
Full-text available
Substrate-based farming practices are considered viable low-cost technologies as they help in sustainable aquaculture production. This investigation of 90-day duration was carried out in mud-bottomed cement tanks to study the effect of substrate and/or feed on growth and production of fringe-lipped peninsula carp, Labeo fimbriatus. The treatments c...
Article
Full-text available
manure. The growth of fish was the highest (P < 0.05) with the diet containing 6% fish oil, followed by 3, 9, and 0%. Food conversion ratio and protein efficiency ratio improved with increasing dietary lipid level. Dietary lipid had a positive impact on carcass lipid level (P < 0.05). Moisture and crude protein did not vary (P > 0.05) from that of...
Article
Two experiments were conducted, one with the herbivorous mahseer Tor khudree and another with the fringe-lipped carp Labeo fimbriatus to study the effect of feeding and periphyton on their growth and production. Twelve tanks (25 m2) with mud bottoms and 0 (control), 98 (low density) or 196 (high density) bamboo poles tank−1 were used. Mahseer (init...
Article
Four diets (T0–T3) were formulated reducing the fishmeal (Indian) component by 100 g kg–1 from 300 to 0 g kg–1 and including proportionately increasing quantities of maize. Diets were fed for 120 days at 50 g kg–1 body weight to triplicate groups of common carp (av. wt. 2.11–2.18 g) stocked at 1 m–2 in mud bottomed cement tanks (18 m2), fertilized...
Article
Supplementation of pelleted feeds (30% crude protein) consisting of practical ingredients with 250, 375 and 500 mg Cholymbi/kg diet resulted significantly improved the growth of common carp, Cyprinus carpio. Highest final average weight was recorded with diet containing 500 mg Cholymbi/kg. Feeding Cholymbi to fish showed increased carcass protein a...
Article
Rohu, Labeo rohita (Ham.), fingerlings (average wt 3.38 g) maintained in 25 m2 cement tanks were fed fish-meal-based, 300 g kg−1 protein diets containing different levels (0, 0.25, 0.5, 0.75 and 1.0 g kg−1) of L-carnitine in triplicate over a period of 126 days. Fish that received 0.5 g kg−1 carnitine showed significantly higher growth than those f...
Article
The effect of feeding Spirulina platensis on the growth, carcass composition, organoleptic quality, digestive enzyme activity and digestibility of common carp, Cyprinus carpio L., was studied through a culture trial lasting 120 days. Four experimental diets were employed by replacing fish meal protein from the standard diet at 25%, 50%, 75% and 100...
Article
Fanners employing crude human chorionic gonadotropin (Sumach, Infar India Ltd.) for inducing breeding of major carps, in India have claimed that it also promotes growth. The present study was undertaken in order to confirm this and its potential statics pure HCG (Sigma Chemicals Ltd), wherein two experiments were conducted in a recirculatory system...