Time filter

Source Type

Sīta Road, Pakistan

Shaheen T.,Fish Seed Hatchery | Iqbal J.,Fish Seed Hatchery | Khan M.,Fish Seed Hatchery | Akhtar T.,University of Punjab
Turkish Journal of Fisheries and Aquatic Sciences | Year: 2011

A total 48 Cyprinus carpio breeders (W = 963±9.5 g; L= 33.60±2.6 cm) were divided into two groups as control (n=24) and experimental (n=24). Control breeds naturally while experimental were subjected to induce spawning using ova prim. Results showed positive correlation in breeder's body weight, gonado somatic index (GSI) and fecundity. Significantly high (P<0.01) fecundity and % hatch is observed in induced spawning as compared to control (open water). In an other experiment 84,000 C. carpio larvae after alluvial stage were grown on 100% body weight spread in two feeds on powdered egg yolk, beef extract, liver extract and live food for 35 days. Stocking density was kept 7,000 larvae per tank in triplicate for each feed. Growth was observed as beef liver extract > beef extract > open water > egg yolk. Maximum survival (57%) was noted in liver extract feed and minimum (25%) in pond water. © Published by Central Fisheries Research Institute (CFRI) Trabzon. Source

Tayybah S.,Fish Seed Hatchery | Tanveer A.,University of Punjab | Chughtai M.I.,Nuclear Institute for Agriculture and Biology NIAB | Khan M.,Fish Seed Hatchery | And 2 more authors.
International Journal of Agriculture and Biology | Year: 2012

The objective of the present study was to identify the degree and damage to the histological structure of gills in Cyprinus carpio exposed to various sublethal concentrations of chromium hexavalent [Cr(VI)]. For this investigation 168 C. carpio breeders (W=500±9.5 g; L=25.60±2.6 cm) were divided at random in to control (n=24) and experimental (n=144) @ 8 breeders/tank (8.84 m 3). Control was kept in normal water, while experimental were monthly exposed to various sublethal concentrations of Cr(VI) (25, 50, 75, 100, 125 & 150 mg/L) separately in triplicate for six months. Actual chromium in water was measured on atomic absorption on monthly basis. In exposed group gill epithelium was found to be severely damaged, necrosed and peeled off with hyperplasia at all the Cr(VI) concentrations in temporal dose pattern. Absconding secondary lamellae and talengectases were noted at 125 and 150 mg/L Cr(VI) concentration. Actual chromium concentration varied from 36 to 118 μg/mL in tanks exposed to Cr(VI) from 25 to 150 mg/L. However, gills had normal histological structure in control. Present results showed that Cr(VI) is highly teratogenic metal and its deteriorating affect increase with the increase in concentration of metal. © 2012 Friends Science Publishers. Source

Ashraf M.,Fisheries Research and Training Institute | Rashid T.,Fisheries Research and Training Institute | Bhatti E.M.,Fisheries Research and Training Institute | Naqvi S.A.,Fisheries Research and Training Institute | Javaid M.,Fish Seed Hatchery
Pakistan Journal of Nutrition | Year: 2010

Brachionus calyciflorus is commonly found in fresh water ponds. Its production depends on unrelenting supply of Chlorella in sufficient quantity. In the current studies a water sample was collected from fish culture ponds by Wisconsin plankton net (64 μm mesh). The freshly collected stock was concentrated and fractionated by passing through 600, 200, 125, 75 and 38 μm sieves arranged vertically with gradual decrease in pore size. The pure Brachionus calyciflorus were fed on Chlorella available in the laboratory. Algae was gradually replaced by yeast to reduce dependency on labour intensive live food. Maximum number of rotifers 413 ml-1, was observed when they were fed on 160:32 yeastalgae ratio by weight combination. Ciliates and cyclops posed a major threat during culture and frequent crashes were observed due to this menace. Cyclops were selectively eradicated from the rotifer culture at 0.09 DDVP after 20 h of exposure but not ciliates. There was no selective mortality in ciliates at any stage. Nevertheless both ciliates and rotifers were dead at 0.2 ppm. Simple method of cyst preservation is mentioned. © Asian Network for Scientific Information, 2010. Source

Discover hidden collaborations