Minor Carp Research Articles

A Study on the Fecundity Indices of a Minor Carp Labeo Bata (Ham- Buch) of the River Daya, Orissa

One hundred fifty two matured specimens of Labeo bata collected from the River Daya, a tributary of the river Mahanadi were studied for their fecundity indices. The absolute fecundity of L bata varied from 37,945 to 69,786 eggs in matured specimens of 150 to 300 mm total length. The relationship between fecundity and total length; fecundity and body weight; fecundity and ovary length; and fecundity and ovary weight were worked out by employing regression analysis. Relationship of fecundity with fish length (r=0.68; pa 0.05), fish body weight (r= 0.72; pa 0.05) ovary length (r=0.76; pa 0.05) and ovary weight (r=0.94; pa 0.05) were positive and significant.

Growth and Instability of Inland Fish Production in Gujarat------ Spatio-Temporal Analysis

Gujarat is well known to be heterogeneous with respect to inland water resources. This Study examines the growth and instability of inland fish production in Gujarat. The data on districtwise and species wise inland fish production in Gujarat state were collected and compiled for the period from 1974-75 to 1997-98 and 1984-85 to 1997-98 respectively. Period wise compound growth rates were computed. Similarly instability indices were measured by letting an exponential time trend. The results revealed that the inland fish production increased significantly in almost all the districts of the state during 1990-98. There existed relatively higher instability in iniond }ish production in different districts of Saurashtra, Bharuch and Surat districts of South Gujarat account for more than 50 percent of the total iniandfish production in the state. The share of all the six districts of Saurashtra together increased substantially over a period of time. Relatively higher growth rates of production were observed for the species viz., Mrigal, Prawns, Rohu, Minor Carp, Eel, etc. Extension efforts need to be strengthened through different media on the nutrious and health promoting qualities of fish so that the inland water resources in the study area are utilized to the fullest extent for fish production.

Histochemical mapping of lipids and proteins in the mesencephalic nuclei and fibre tracts of hill-stream teleost Barilius bendelisis (Ham.)

The observations on histochemical localisation of lipids including phospholipids and proteins have been made in the nuclear areas and fibre tracts of the mesencephalon of a hill-stream minor carp Barilius bendelisis (Hamilton). The different layer of optic tectum exhibit moderate to intense contents of lipids and phospholipids whereas protein concentration varies from negative to intense. Most of the nuclei of mesencephalic tegmentum show moderate concentration of Sudan Black B and acid haematin positive materials and similarly of mercury bromophenol blue positive substances. Practically all the fibre connections have either intense or strong staining of Sudan Black B and acid haematin tests. But the presence of proteins in some tracts is either negligible or poor or inconsistent. In nuclear areas, intracytoplasmic membranous organelles contribute to the major fraction of lipids whereas it is myelin of the sheaths of axonic fibres.

Histoenzymological localization of glycerol 3 phosphate dehydrogenase and succinate dehydrogenase in the mesencephalon of a minor carp Barilius bendelisis (Hamilton)

Histoenzymological localization of glycerol 3 phosphate dehydrogenase and succinate dehydrogenase in the mesencephalon of a minor carp Barilius bendelisis (Hamilton)

Toxicity of crude oil to the metabolism of freshwater minor carp, Puntius sophore.

The effects of crude oil on the rate of metabolism in freshwater fishes have been little investigated. In the present investigation, the respiration rate in vitro and overall QO/sub 2/ in vivo of a freshwater minor carp Puntius sophore has been measured after exposing the fish to the lethal and sublethal doses of crude oil extracts for varying periods.

Influence of ambient oxygen on random activity in some freshwater teleosts

The influence of ambient oxygen concentrations on random (spontaneous) activity was tested in four freshwater teleosts (mullet,Rhinomugil corsula, cichlid,Tilapia mossambica, minor carp,Puntius sarana and goldfish,Carassius auratus) at various ambient oxygen concentrations below air saturation at two temperatures 30 and 35° C. A modification of Fry’s respirometer and fish activity counter was used for the experiments. The initial ambient oxygen gradually fell from air saturation to reach the asphyxial level (the concentration at which the fish begin to lose equilibrium) by the depletion of oxygen due to the respiration of the fish itself. Among the four species tested, only inTilapia mossambica the random activity decreased with decrease in ambient oxygen whereas the other three species indicated a reverse trend. The differences in responses of random activity to ambient oxygen may be due to a dichotomy in behavioural evolution and may have a major role in the survival of the species.