The present study elucidated the length-weight relationship and condition factor of the Indian major carps catla Catla catla, rohu Labeo rohita and mrigala Cirrhinus mrigala from the Vallabhsagar Reservoir, Gujarat. The mean total lengths (TL) recorded for the three species during the study were, 40.734±0.614, 39.285±0.892 and 38.010±0.925 cm while mean weights (WT) recorded were 914.141±46.672, 969.306±93.738 and 635.714±51.129 g for catla, rohu and mrigal, respectively. The length and weight variables showed linear relationship as depicted by correlation coefficient (r) values of 0.987 in catla, 0.956 in rohu and 0.967 in mrigal. Growth in the three species was found to be positive allometric and exponent values (b) obtained were 3.104, 3.342 and 3.049 for catla, rohu and mrigal respectively. The condition factor (K) and relative condition factor (Kn) estimated revealed the well being of fish and conducive environment of the reservoir. Results of the study provided baseline information which would be helpful for the scientific management of Indian major carp fisheries in the Vallabhsagar Reservoir in Gujarat.
In the civil society different festivals are celebrated, these are the integral part of human life and many of festivals are religious, seasonal change and culturally important. The present study elucidated environmental impact of Ganesh idol immersion on water quality of Tapi River and for this purpose water samples were collected during different durations (pre immersion, during immersion and post immersion) from selected sampling stations or idol immersion points of Tapi River. The important water quality parameters like pH, temperature, dissolved oxygen, free carbon dioxide, total hardness, total alkalinity, biological oxygen demand, chemical oxygen demand, oil & grease and total calcium were analysed for the study. Result shows that dissolved oxygen was depleted while remaining parameter were increased during the idol immersion and it was concluded that aquatic ecosystem of Tapi river was deteriorated and pollution and nutrient load were increased due to these religious activities. The celebration of festivals and these religious activities can’t stop but pollution can reduce to save the river.
AbSTRCTIn the present paper an attempt has been made to study of physico-chemical parameters of downstream in Ukai, Tapi River (Gujarat). For this study the water samples were collected at monthly interval during December 2012 to November 2013 and important water quality parameters were analyzed. Study revealed that temperature, pH, conductivity, dissolved oxygen, chemical oxygen demand, nitrate-n, total hardness, fluoride, chloride, total alkalinity and sodium were within the permissible limits whereas turbidity, biological oxygen demand, nitrite-n ammonia, phosphate and potassium were beyond the permissible limits of state, national and international authorities like GPCB, CPCB WHO and USEPA. These result depicted that water body was polluted in the form of nutrient enrichment which is due to agricultural activities and its runoff in and around catchment area of downstream.
Abstract:The gut content analysis provides the information on food components and feeding habit of fish which is an important aspect for fisheries management. In present study, the qualitative and quantitative analysis of gut content of Indian major carp rohu (Labeo rohita Ham. 1822) from Vallabhsagar reservoir (Gujarat), were conducted during June 2013 to May 2014. The results on gut content shows that qualitative changes in food component were not found but quantitative changes were observed during the study period. In the gut of fish, food contents i.e. phytoplankton (32.52 %), plant materials (25.07 %), Insects (13.39 %), decay matter (13.39 %) and zooplankton (11.42 %) were observed. The quantitative changes of food contents were also verified by the analysis of gasrosomatic index (GaSI) and it was maximum (5.582 ± 0.106) during post breeding season and minimum (3.589 ± 0.150) during breeding season as fish feeds voraciously to compensate the energy loss due to sexual maturity. On the basis of these results, it was concluded that studied fish (rohu) was herbivorous and mainly fed on phytoplankton and plant materials.
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