NOPR Collection:

Growth and food conversion efficiency in the fish Etroplus suratensis in relation to different feeding levels

2016-12-21T06:26:28Z

Title: Growth and food conversion efficiency in the fish Etroplus suratensis in relation to different feeding levels Authors: Sumitra-Vijayaraghavan; Royan, J P; Rao, T S S Abstract: Based on chemical composition of feed and body constituents, food utilization at maintenance and different production levels was estimated. On theoretical derivations, 175, 450 and 650 kcal/kg^0.8/week represented the maintenance, optimum and maximum levels. Utilization of gross energy at maintenance level was 35.91% which was lower than the values reported for common carp, grass carp and trout. Percent available energy at maintenance level was 48.75 of the gross energy offered to the fish. Utilization of gross protein energy at maintenance level was 33.97% which was equivalent to the rate of utilization of gross total energy. The optimum feeding level for effective growth under laboratory conditions was 10% live body weight/day. Page(s): 350-352

Effects of different feeding levels on moulting, growth, food conversion efficiency and biochemical composition of the prawn, Metapenaeus monoceros (Fabricius)

2016-12-21T06:23:54Z

Title: Effects of different feeding levels on moulting, growth, food conversion efficiency and biochemical composition of the prawn, Metapenaeus monoceros (Fabricius) Authors: Sumitra-Vijayaraghavan; Royan, J P; Rao, T S S Abstract: Growth efficiency (K₁ and K₂) increased from 7 to 15% feeding levels, Maximum water content was recorded in starved prawns and the minimum at 20% feeding level. On theoretical basis, average daily feeding level of 45, 120 and 170 mg dry food/g prawn/day represented the maintenance, optimum and maximum feeding levels. Specific dynamic action increased twice at the observed maximum feeding level (20%) than at optimum feeding level (12%), indicating that the energy cost of converting food into body tissue increased at higher feeding levels. Page(s): 347-349

Effectiveness of formaldehyde in Caligus infection of laboratory reared grey mullet, Mugil cephalus (L)

2016-12-21T06:20:01Z

Title: Effectiveness of formaldehyde in Caligus infection of laboratory reared grey mullet, Mugil cephalus (L) Authors: Chatterji, A; Ingole, B S; Parulekar, A H Abstract: Mortality due to infection by a copepod ectoparasite, Caligus bombayensis (R) was recorded in laboratory reared grey mullet. Spread of infection was rapid and most of infected fish died within 4 days and the entire batch died in 6-10 days. Treatment with 0.02% formaldehyde solution was effective in eradicating the infection. Page(s): 344-346

Distribution of meiobenthos and macrobenthos at the mouth of some rivers of the East Coast of India

2016-12-21T06:17:50Z

Title: Distribution of meiobenthos and macrobenthos at the mouth of some rivers of the East Coast of India Authors: Ansari, Z A; Rodrigues, C L; Chatterji, A; Parulekar, A H Abstract: Distribution of meio- and macrobenthos of muddy bottom deposits at the mouth of Krishna, Godavari, Mahanadi and Hooghly rivers was studied from replicate sampling. Total meiofauna ranged from 226 animals/4.5 cm² to 967 animals/4.5 cm² in the top 10 cm layer of the bottom deposits. Macrofaunal density varied from 90/m² to 4785/m². Nematodes, harpacticoids and polychaetes were the important faunal taxa. Meiobenthic population was contagiously distributed. Page(s): 341-343