Studies on relative energy budget in different weight groups in a fresh water siluroid fish, Mystus cavasius (Ham.) has been made at water temperature 30.0±1.0°C. The total energy available in feed (C)/day/fish ranged from 2192.4 Joules (in 12.2g fish) to a value of 26989.2J (in 102.0g fish). The percent energy value ranged from 12.3-13.6, 7 (fixed), 35.2-36.8, 36.0-43.3 and 0.6-8.2% respectively in faeces (F), Urine formation (U), growth (P), respiratory metabolism (R) and miscellaneous activities (M.A.). The details have been discussed in this paper.
Mastacembelus armatus (Lac) has bimodal gas exchange mechanism as the fish uses both the gills and skin to obtain 02 from water. The skin can obtain 02 both from water as well as air. 02 consumption in this mud eel have been determined by the method as followed by Kumar and Ahsan (2018) at the water temperature 20.0±1.0°C (winter) and 30.0±1.0°C (Summer). The statistical relationship between 02 consumption (V02) vs. body weight during winter (20.0±1.0°C) and summer (30.0±1.0°C) months are represented by the equation :- V02 (ml/hr) = 0.1397.14/97286 and V02 (ml/hr) = 0.219514r1° respectively. The details have been discussed in this paper in the light of thermal compensatory metabolic regulation in this fish.
Studies on daily food intake, energy value of ration, total faecal discharge, energy value of faeces and excretory product (U) have been made in different weight groups of an air breathing catfish, Mystus cavasius (Ham.). The above parameters ranged from 0.58-7.14 glfish/day, 2192.4 – 26989.2 joules, 0.0710.791 g/day/dry wt, 269.66 to 3670.53 joules and 152.07-1889.24 joules respectively within the weight range 12.2 to 102.0g. The details have been discussed in this paper.
In the present work an attempt has been made to study oxygen consumption in different weight groups of a teleostean fish, Puntius sophore (Ham.) at habitual water temperature in winter and summer months to assess compensatory regulation in their metabolism to seasonal thermal variations. The experiments were conducted at 19.0±1.00C (winter) and 29.2±1.00C (summer months). Though at both the habitual temperatures, a clear trend of increase in total oxygen consumption with increasing body weight was observed but it increased with a value of 0.64 (b value or regression coefficient) in summer months while such value was recorded to be 0.80 (b value) in winter months indicating compensatory regulation in their metabolism to seasonal thermal variations. The details have been discussed in this paper.
Studies on the toxic effect of Mardo (an organophophate pesticide) on bimodal oxygen uptake in a fresh water teleostean fish, Mystus vittatus (Bloch) have been made. The LC values of Mardo were 50 calculated to be 0.490, 0.420, 0.330 and 0.270 mg/l respectively for 24 h, 48h, 72h and 96 hours exposure at o 30.0±1.0 C. Control group of fishees (35.0±1.5g) secures 51.47±1.12 cc/kg/h from gills and 2.270±0.22 (from skin through aerial route i.e total 54.167±1.25cc/kg/h. Mardo intoxication (at sub lethal concertrations of 0.18, 0.20 and 0.215 mg/l) in mystus vittatus caused significant decrease in aquatic respiration through gills and total oxygen uptake but significant increase in aerial 0 uptake (through skin) as compared to 2 control. The reason for such changes have been discussed in this paper.
Studies on the effect of Mardo (newly introduced orgarophosphate pesticide) on changes in haematological indices were made in a fresh water fish, Mystus vittatus (Bloch). The mean value of RBC counts, mean erythrocyte diameter, Hb content, packed cell volume (PCV), MCH, MCHC and total 3 leucocyte counts in control group of fishes were – 1.913±0.002 (million cells/mm of blood), 37.65±0.125 2 µm , 8.105±0.045 g/100ml, 13.7±0.344%, 45.605±0.093 pg, 56.405±0.004% and 24.0±0.127 3 thousands/mm . The treatment of sub lethal dosages (0.15, 0.18, 0.20 and 0.215 mg/l) of Mardo for 96 hr brought statistically significant decrease in most of the above noted indices as compared to control. The reason for such changes has been discussed in this paper.
Studies on water, protein, lipid content and calorific values (k.cal/g) in different tissues such as muscle, liver, kidney, ovary and brain have been made in a fresh water Indian major carps Labeo calbasu (Ham. ). Protein, lipid content and calorific values were found maximum in liver while the brain contained maximum water content (88. 15%) and minimum amount of protein content (9.3010.84%). The details have been discussed in this paper.
Studies on changes in biochemical composition and calorific value (Kcal g) in relation to body weight and sex have been made in a fresh water Indian major carp, Labeo calbasu (Ham.). There is high statistical correlations between body weight (g) Vs. water, lipid, protein, ash content and calorific values in this fish. The males have lower protein content and calorific values as compared to females but the difference was statistically nonsignificant.