• T J Varghese

      Articles written in Proceedings – Animal Sciences

    • Preliminary studies on the relative growth rates of three Indian major carp hybrids

      T J Varghese B Shantharam

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      A comparative study of the growth rates of three Indian major carp hybrids, namely, catla-rohu, mrigal-catla and mrigal-rohu, was made. The results showed that the growth of catla-rohu hybrid was the fastest followed by mrigal-catla while mrigal-rohu hybrid exhibited the poorest growth rate. Compared to the growth of mrigal-rohu hybrid, the increases in weight of catla-rohu and mrigal-catla hybrids were respectively 257·58% and 110·90% more. On statistical analysis of the growth data it was seen that the growth rates of the three hybrids studied differed significantly from one another.

    • On the taxonomic characters of two major carp hybrids, catlarohu and rohu-catla

      P Konda Reddy T J Varghese

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      Two major carp hybrids, namely, catla-rohu and rohu-catla, were produced by crossing male catla with female rohu and male rohu with female catla, respectively. The taxonomic characters of the two hybrids were studied and compared with those of the parental species, catla and rohu. The two hybrids were intermediate between the parental species for most of the taxonomic characters. In both the hybrids, the body was deeper than in rohu and the head smaller than in catla. This combination of characters makes the hybrids more desirable breeds than either parent. In both the hybrids, the mouth was terminal and only the lower lip was slightly fringed. They possessed a pair of short maxillary barbels. The two hybrids catla-rohu and rohu-catla resemble each other, the difference being noticed only in a couple of minor characters.

    • Embryonic and larval development of rohu-mrigal hybrid

      Y Basavaraju T J Varghese

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      A detailed study of the embryonic and larval development of the major carp hybrid, rohu-mrigal, has been made and compared with the parents. The development of the hybrid was normal and more or less similar to that of the parental species, with only a few minor differences. The hybrid larvae exhibited intermediate range between the parental species in morphological features, such as nature of lips, presence of barbels and the shape of the caudal spot.

    • Protein requirement of the carps,Catla catla (Hamilton) andLabeo rohita (Hamilton)

      K M Renukaradhya T J Varghese

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      In order to determine the optimum protein requirement in the feeds forCatla catla (Hamilton) andLabeo rohita (Hamilton), isocaloric pelleted feeds containing 20%, 30%, 40% and 45% protein were formulated using casein as the main source of protein. The best growth of catla and rohu was observed when fed on feeds containing 30% and 40% protein. The growth was poorer when fed on the diet containing 20% protein and poorest when fed on the feed containing 45% protein. The results revealed that the protein requirement of both catla and rohu was around 30%. It also indicated that more than the optimum level of protein in feeds has an adverse effect on the growth of the species investigated.

    • Effect of artificial aeration on the growth and survival of Indian major carps

      M M Vijayan T J Varghese

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      An experiment was conducted to study the effect of artificial aeration on the growth and survival ofCatla catla (Ham.),Labeo rohita (Ham.) andCirrhinus mrigala (Ham.). Aeration was effected by means of an air-lift system, which sucks water from the bottom and splashes the oxygenated water at the surface, thus facilitating circulation and aeration. All the 3 species of fish recorded slightly better growth in aerated cisterns when compared to the controls. However, the difference observed was marginal and statistically not significant due to the shorter duration of the experiment. Rohu and mrigal exhibited higher survival in aerated cisterns, while catla did not show much variation between the two sets. The overall computed fish production and the average rate of survival were significantly higher in the aerated cisterns when compared to the control.

    • Effect of diethylstilbestrol on growth and food conversion of common carp,Cyprinus carpio (Linn.)

      T Nanjundappa T J Varghese

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      Diethylstilbestrol, an estrogen, was administered through diet to fingerlings of common carp,Cyprinus carpio at concentrations of 0, 1, 3 and 5 ppm over a period of 98 days and its effects on growth and food conversion efficiency were evaluated. The experiment was conducted in 12 cement cisterns of 25 m2 area each. Fishes were fed daily at the rate of 5% of body weight. Diethylstilbestrol incorporated diets induced faster growth and better food conversion efficiency as compared to the control. Among the dosages tried, 3 ppm treatment yielded the best growth. The faster growth in diethylstilbestrol treated groups was significantly different (P<0·05) from that of the control.

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