Dr. Mohd Arif

Zinc is an essential trace element for the normal development and metabolism of living organisms. Mrigal
(Cirrhinus mrigala) was exposed to sub-lethal concentrations 9.3, 13.2, 18.6, and 31 mg/l of zinc sulfate
for 30 days and ultrastructural alterations were observed in the gills. The gill epithelium of the untreated
group showed a normal architecture while zinc- treated groups showed certain marked changes in gill
tissues such as fusion of secondary lamellae, edema, disruption of gill epithelium, hypertrophy, hyperplasia, broken and swollen micro ridges, broken tips, and upliftment of gill rakers, heavy exudation of
mucous and disorganization of secondary lamellae. These changes demonstrate the morphological
responses of the fish when exposed to zinc sulfate. The present study clearly shows that gills are an
important target organ for zinc toxicity in C. mrigal

Jammu division of Jammu and Kashmir is a region of high biological diversity and
endemicity of fish fauna, but very little is known about the distribution of freshwater indigenous
ornamental fish. The study was carried out across the tributaries of three rivers viz., Chenab,
Tawi and Basantar to study the diversity of ornamental fish. Regular collection trips were
carried out at 13 different stations for a period of one year from December 2017 to December
2018 and a total of 30 species were reported belonging to 8 families and 18 genera. In all the
study stations Cyprinidae family was found to be most prevalent (85%) and Osphronemidae
(1%) was the least. The present work is a preliminary study on the distribution and abundance
of ornamental fishes from freshwater bodies of Jammu.

In the present study, the karyotype of two teak defoliator sps. of, Eutectona, Hyblaea was studied from Jammu region, India. Chromosomal studied were made from testis by using 2% Giemsa air drying method. The chromosomes at metaphaseI stage appeared almost of similar size. The haploid chromosome numbers observed in E machaeralis and H purea were 18 and 31, respectively. The largest chromosome was 1.3µm and 0.9 µm in length while the shortest chromosome was 0.4µm &0.3µm respectively. Centromeric fusion of chromosome in these species must played active role leading to decrease in diploid chromosome number.

In the present study, the karyotype of two teak defoliator sps. of, Eutectona, Hyblaea was studied from Jammu region, India. Chromosomal studied were made from testis by using 2% Giemsa air drying method. The chromosomes at metaphaseI stage appeared almost of similar size. The haploid chromosome numbers observed in E machaeralis and H purea were 18 and 31, respectively. The largest chromosome was 1.3µm and 0.9 µm in length while the shortest chromosome was 0.4µm &0.3µm respectively. Centromeric fusion of chromosome in these species must played active role leading to decrease in diploid chromosome number.