Surfacing activity and food utllization in a tropical air-breathing fish exposed to different temperatures

In tropical countries like India, \vhere availability of freshwater is limited , air-breathing fishes may be chosen for aquaculture, as they thrive in shallow waters deficient in oxygen. However, the advantageous air-breathing habit of these fishes and the consequent need to surface more or less at regular intervals may impose a considerable drain of energy, which otherwise could have been channelled into fish productio

Erythrocyte count and haemoglobin concentration of some tropical fishes

In all three species studied, values obtained for blood properties such as erythrocyte counts haemoglobin concentration were the highest for males, intermediate for females and least for juveniles. The reason for the sex-dependent changes in the blood properties is not at present clear

Effects of feeding and starvation on growth and swimming activity in an obligatory air-breathing fish

There exists an enormous body of literature on metabolism of fishes as studied by oxygen consumption. Since standard metabolism relates to 'maintenance energy cost' of nonfeeding, nondigesting, nongrowing, nonactive fish, Winberg (1956) rightly appealed for more studies on active metabolism. Studies on -active metabolism required exercising apparatus and techniques, such as grids or electrified fields, to ensure a high sustained level of activit

A Comparative Study of Flood Estimation Using Data Transformation Methods

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

Effects of food quality on swimming activity and food utilization in the air-breathing fish Ophiocephalus striatus

In cylindrical aquaria, liver fed O. striatus increased surfacing from 1104 times at 2.5 cm depth to 1738 times/day at 40 cm depth. Due to the sustained surfacing. O. striatus "hung" to the surface 20 times for 1 h/day in the former and 27 times for 3.2 h/day in the latter. Feeding increased from 24 to 40 mg/g.day, assimilation 24 to 34 mg/g•day and metabolism 0.5 to.1.1 ml O2 uptake/g•h in these groups

Food utilization in the fish Tilapia mossambica fed on plant and animal foods

Only a few publications are available concerning food utilization in herbivorous fishes (see PANDIAN, 1975). MENZEL (1959) found that angelfish Holacanthus bermudi? nsis, fed on epizoan-free filamentous algae, failed to deposit protein ; he concluded that, though the utilized algae were sufficient to meet the metabolic energy requirements, the animal matter ingested intentionally or accidentally by the angelfish was essential to insure "true growth" (GERKING, 1952)

Food intake, conversion and swimming activity in the air-breathing catfish Heteropneustes fossilis

Pandian & Vivekanandan (1976) and Vivekanandan ([976), who considered feeding rate and conversion efficiency estimates as parameters for assessing metabolic rates and efficiencies. observed that the obligatory airbreathing fish Opiliocepha/us slriatus, reared in aquaria containing different depths of water, swam longer or shorter distance to exhange atmospheric air; such a design of experiment permitted them to measure food intake. growth and sustained active metabolism on a long term basis

Effects of the Po2 on surfacing activity and food utilization in the air-breathing perch Anabas scandens

Fed Anabas scandens surfaced 555 times, swimming 278 m/day in non-aerated water (PO2 66 rnm Hg) and 855 times, travelling 428 m/day in aerated watcr (PO2: 147 mm Hg). Consumption, assimilation, production and metabolism of either series averaged 22. 18. 5 and 13 mg dry substance/g live fish/day, respeclively

Effects of algal and animal food combinations on surfacing activity and food utilization in the climbing perch Anabas scandens

A. scandens was fed on five different combinations of the alga Spirogyra maxima and goat-liver. With increasing liver supplementation, the following increases were noted: consumption of food from 31 to 152 cal/g live fish•day, assimilation efficiency from 88 to 98%, production rate from 1.5 to 45.5 cal/g. day and the ef'fu;:iency from 5 to 17%

Effects of the Po<SUB>2</SUB> on surfacing activity and food utilization in the air-breathing perch Anabas scandens

Fed Anabas seandens surfaced 555 times, swimming 278 m/day in non-aerated walcr (Po2: 66 rnm Hg)' and 855 limes, travelling 428 m/day in aerated watcr (Po2: 147 mm Hg). Consumption, assimilation, production and metabolism of either series averaged 22, 18, 5 and 13 mg dry substance/g live fish·day, respeclively. The high Po2 elevated metabolism, increased surfacing and swimming activities but failed 10 alter food utilization. Culturing A. scandens in aerated waters offers no special advantage. Starved fish in non-aerated and aerated waters surfaced 330 times and swam 164 m/day, expending 1.5 mg/g ·day