Spotted Snakehead

description

Materials and Methods Collection and maintenance of test fish Channa punctata were collected from culture pond near Serispore T. E., Hailakandi, Assam, India and brought to the laboratory in aerated containers. In the laboratory, the fishes were maintained in an aquarium with constant aeration. Fishes were fed with commercially available fish meal twice daily and were acclimatized in the aquarium for a week before the experiment. Experimental design of fish bio-assay For test setup, Channa punctata were kept in a tank (Group-I) with heavy metal (CdCl 2) for seven days. A control with no treatment was also run simultaneously in another tank. After seventh day, the protein content of liver was examined. Experimental Design The fishes were randomly divided into three groups viz., control, low dose, sub-lethal- 1 (SL-I, 5 ppm) and high dose sub-lethal 2 (SL-II, 10 ppm). They were kept in three different buckets containing 5 litres of water obtained from a pond and were labelled as control, SL- 1 (5 ppm) and SL- 2 (10 ppm). The experiment was run for seven days. Fishes were taken out from all the tanks after seven days and were anesthetized and the total length and body weight were reco

Sub-lethal toxic effect of cadmium chloride (CdCl) on freshwater murrel Channa punctata (BLOCH)

discussion

Results and Discussion The present study indicated that the heavy metal Cadmium Chloride (CdCl 2) has a dreadful effect on the freshwater fish Channa punctata (Bloch) (Qureshi et al, 2011) [3]. From the behavioural responses of fish exposed to sub-lethal concentration of the heavy metal showed that they were under stress. The increase in opercular movement and the bottom to upward movement of the fishes to overcome hypoxic condition was seen in the 5 th and 7 th day of exposure. Mucus secretion, starting of depletion of scales, skin lesions on dorsal and lateral side of the body, copious mucus, clumping of gills increased with the increasing concentration of the toxicant (Rastogi, et al., 2018) [5]. Colour changes of the body from blackish to pale yellowish and restlessness again confirmed the anxiety level of the fishes in the experiment (Table 1). Also many visible lesions were observed near operculum, mouth, pectoral and pelvic fins and also near the caudal fins. Also from the total protein content assay, it was observed that the gills and liver tissues when exposed to sub lethal heavy metal concentration of CdCl 2 (5 ppm and 10 ppm) showed gradual decline in the protein content

Sub-lethal toxic effect of cadmium chloride (CdCl) on freshwater murrel Channa punctata (BLOCH)

conservation

Conservation. Conservation status in Afghanistan: Unknown. — IUCN: LC (Chaudhry et al. 2019). — Threats: FIT, CON, HAB, EUT. — Low sensitivity to human activities. — Not considered as a keystone species. — Decline status: Stable. — Low priority for conservation action.

Fishes of Afghanistan; a revised and updated annotated checklist

discussion

Status in Afghanistan. First record from Afghanistan by Day (1875 – 1978: 1880); confirmed by Coad (1981: 17; 2014: 314; 2015: 229). — Afghanistan materials: None.

Fishes of Afghanistan; a revised and updated annotated checklist