Seasonal variation in food and feeding habit of Indian major carp (Labeo rohita Ham.1822) in Vallabhsagar reservoir, Gujarat

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

Phytoplanktonic diversity in lake Jaisamand, Rajasthan (India)

The present study describes the diversity of phytoplankton in the lake Jaisamand of Rajasthan (India). Results depict that phytoplankton was contributed by six major groups which comprised total 85 species. Out of which 13 belongs to Myxophyceae, 5 to Euglenophyceae, 38 to Chlorophyceae, 3 to Xanthophyceae, 1 to Cryptophyceae and 23 to Bacillariophyceae. Thus, Bacillariophyceae and Chlorophyceae turned up as the dominant groups in terms of density (159-554 numbers per liter and 24-485 numbers per liter) and species number (23 and 38), respectively. It was revealed that Jaisamand Lake maintained fairly good population of phytoplankton which is indication of providing broad base for achieving high productivity in this water body

Festivals and deterioration of aquatic environment: A case study of Idol immersion in Tapi River, India

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

Impact of Ganesh Idol Immersion Activities on the Water Quality of Tapi River, Surat (Gujarat) India

Abstract In this paper the impact of Ganesh idol immersion on water quality of Tapi River is discussed, for this purpose Ashwanikumar immersion point (Ovara) was selected as sampling station because large number of Ganesh idols immersed on this Ghat of Tapi River. Water samples were collected at morning hours during pre immersion, during immersion and post immersion periods of Ganesh idols. The changes in physico-chemical properties of Tapi River were observed except temperature, pH and DO with minor changes while CO 2 , BOD, COD, total alkalinity, total hardness, total calcium, and oil & grease were observed with major changes during immersion period. On the basis of these changes it is concluded that level of water pollution increases in Tapi River due to these religious activities and causes adverse effect on the aquatic ecosystem. No one can stop these religious activities but awareness among the people and society can reduce the pollution

Effect of Covid-19 Pandemic on Shrimp Farming at Navsari, Gujarat, India

The lockdown on account of the Coronavirus disease 2019 (COVID-19) adversely impacted the food production sector including aquaculture globally. Unfortunately, it coincided with the major shrimp farming season in India which contributes 60% of the national annual shrimp production hence the impact was substantial. Shrimp farmers follow the different management practices in shrimp farming operations like seed, feed, probiotics, medicine, disruptions in the supply chain, transportation, harvesting and marketing. Therefore, the objective of present study was to find out the impact of COVID-19 pandemic on shrimp farming sector in Navsari (Gujarat). These findings are depicted that management practices of the shrimp farming in study area was disturbed and huge economic losses was faced by the shrimp farmers during pandemic situations. It is suggested that technical and financial assistance for safe, sufficient and hygienic supply of seed, feed, probiotics, chemicals, medicines and probiotics by the government agencies should be ensured which help to shrimp enhance the aquaculture production and survive of shrimp farmers. The result of present study is also helpful for the government authorities to develop policies and execution of the plans during such pandemic condition for shrimp farmers that can prevent the production loss and sustain the shrimp farming industry

Bacteriological Analyses of Fish Mucus from Fish Market with Reference to Consumer’s Health

A study was conducted to evaluate the bacteria load present in fish mucus collected from Nanpura wholesale fish market during the period from 30th December 2022 to 20th February 2023. Total 20 fish mucus samples were determined by Total Plate Count (TPC) and identification of bacteria. High bacterial load with pathogens such as Escherichia coli (Gram negative bacteria) and Staphylococcus aureus (Gram positive bacteria) were found in all fresh and marine fish samples from study area. These pathogens can survive and multiply in fish, transferred into consumer by way of food and main source of fish poisoning, diarrhoea, meningitis and septicemia which cause health risk to consumer. The fishes were contaminated with pathogenic bacteria indicated poor handling of fishes, lack of preservation facility and unhygienic condition of study area. Thus, it is strongly recommended to improve the quality control and quality assurance systems of the study area to minimize the prevalence of pathogenic bacteria

Length–weight Relationship and Condition Factor of Silver Pomfret (Pampus argenteus), Damanganga Estuary, Daman

A study was conducted on the length-weight relationship and condition factor of the commercially important fish, Silver Pomfret (Pampus argenteus), in the Damanganga estuary in Daman. Fish samples were collected from January 2021 to March 2021, with a total of 330 randomly sampled fish collected from fishermen. The average total length was 23.309±0.775 cm and the average total weight was 259.606±20.144 grams measured using standard methods. The 'b' value of Pampus argenteus showed a negative allometric (b<3.0) growth pattern, with the total length being positively correlated with the total weight of the fish (r²=0.829). The growth pattern was negative allometric while the Fulton condition factor (2.03±0.114) indicated good condition. Therefore, further studies on the length-weight relationship should focus on the sustainable management of the fisheries