30 research outputs found
Understanding and addressing microplastic pollution: Impacts, mitigation, and future perspectives
No full textImproper disposal of household and industrial waste into water bodies has transformed them into de facto dumping grounds. Plastic debris, weathered on beaches degrades into micro-particles and releases chemical additives that enter the water. Microplastic contamination is documented globally in both marine and freshwater environments, posing a significant threat to aquatic ecosystems. The small size of these particles makes them susceptible to ingestion by low trophic fauna, a trend expected to escalate. Ingestion leads to adverse effects like intestinal blockages, alterations in lipid metabolism, histopathological changes in the intestine, contributing to the extinction of vulnerable species and disrupting ecosystem balance. Notably, microplastics (MPs) can act as carriers for pathogens, potentially causing impaired reproductive activity, decreased immunity, and cancer in various organisms. Studies have identified seven principal sources of MPs, including synthetic textiles (35%) and tire abrasion (28%), highlighting the significant human contribution to this pollution. This review covers various aspects of microplastic pollution, including sources, extraction methods, and its profound impact on ecosystems. Additionally, it explores preventive measures, aiming to guide researchers in selecting techniques and inspiring further investigation into the far-reaching impacts of microplastic pollution, fostering effective solutions for this environmental challenge
Construction of Seawall - Useful or Harmful for Biodiversity Conservation
No full textNot AvailableA seawall is useful to protect coastal infrastructure and lives from the wave action of the ocean. There are various forms of seawall present and it is made up based on the requirement and nature of wave action of the ocean. The seawall is not only useful in modern days but they are harmful to the coastal biodiversity.
Coastal species have disappeared after seawall formation because many species sustained high wave action and periodic inundation of seawater. Moreover, the loss of beaches has also been reported in many studies.Not Availabl
Economic Analysis of Fish Farmers and Fishers in Kamrup District, Assam, India
No full textThis study was conducted to explore the understanding of economic condition of Fish farmers and Fishers in inland fisheries of Assam, a north-eastern state of India that is rich in inland fisheries resources and represent the condition of many developing countries. A survey of 60 fish farmers and 60 fishers was conducted in Kamrup, a representative district of the Indian state, from 1 October to 31 December 2015.Fish farmers and fishers are selected randomly. An ex-post-facto research design was followed to carry out the study that have already occurred .A structured Interview schedule was developed incorporating relevant points to accomplish the objectives set for the study. It is observed that fish farmers of Bazera development block are lagging behind from fish farmers of Hajo Development Block. The study also revealed that fish farmers has a better income as compared to fishers purely from fisheries sector alone and block wise analysis revealed that Hajo Development Block is better positioned in terms of the income of both fishers and fish farmers as compared to Bezera Development Block. This paper explores to understand the status and cause of existing income so that developmental policies and conservation measure of resource can be oriented in right perspective
Economic Analysis of Fish Farmers and Fishers in Kamrup District, Assam, India
No full textThis study was conducted to explore the understanding of economic condition of Fish farmers and Fishers in inland fisheries of Assam, a north-eastern state of India that is rich in inland fisheries resources and represent the condition of many developing countries. A survey of 60 fish farmers and 60 fishers was conducted in Kamrup, a representative district of the Indian state, from 1 October to 31 December 2015.Fish farmers and fishers are selected randomly. An ex-post-facto research design was followed to carry out the study that have already occurred .A structured Interview schedule was developed incorporating relevant points to accomplish the objectives set for the study. It is observed that fish farmers of Bazera development block are lagging behind from fish farmers of Hajo Development Block. The study also revealed that fish farmers has a better income as compared to fishers purely from fisheries sector alone and block wise analysis revealed that Hajo Development Block is better positioned in terms of the income of both fishers and fish farmers as compared to Bezera Development Block. This paper explores to understand the status and cause of existing income so that developmental policies and conservation measure of resource can be oriented in right perspective
Not Available
No full textNot AvailableThe golden mahseer (Tor putitora) is an important and high valued sport and food fish of national and international importance. Therefore for promotion of golden mahseer, proper mineral supplementation in early developmental stages is very important. The present study evaluated the effects of dietary zinc on growth, survival and physiological response of Tor putitora fry. One thousand eight hundred fry (avg.wt 54.35±3.09 mg) were randomly distributed into 6 treatment groups with triplicates each. Six iso-nitrogenous (40±0.02% to 41.44±0.01% crude protein) semi-purified diets were prepared with graded levels of dietary zinc. Zinc sulphate was added as the dietary zinc source to the basal diet. The results indicated that specific growth rate (SGR) was of value 2.52 ±0.23 gm of T. putitora fry which increased with dietary zinc levels up to a concentration of 40 mg Zn Kg-1 in diet. The zinc dependent metabolic enzymes and antioxidant enzymes was also observed to be highest in groups supplemented with 40 mg zinc/kg feed. The overall results of the present study suggest the efficacy of dietary zinc on growth, survival and physiological response of golden mahseer fry in order to garner the possibility of establishing the species to commercial aquaculture.Not Availabl
Effect of dietary zinc on the growth and metabolic enzyme activities of golden mahseer (Tor putitora) fry
No full textThe golden mahseer (Tor putitora) is an important and high valued sport and food fish of national and international importance. Therefore for promotion of golden mahseer, proper mineral supplementation in early developmental stages is very important. The present study evaluated the effects of dietary zinc on growth, survivaland physiological response of Tor putitora fry. One thousand eight hundred fry (avg.wt 54.35±3.09 mg) were randomly distributed into 6 treatment groups with triplicates each. Six iso-nitrogenous (40±0.02% to 41.44±0.01% crude protein) semi-purified diets were prepared with graded levels of dietary zinc. Zinc sulphate was added as the dietary zinc source to the basal diet. The results indicated that specific growth rate (SGR) was of value 2.52 ±0.23 gm of T. putitora fry which increased with dietary zinc levels up to a concentration of 40 mg Zn Kg-1 in diet. The zinc dependent metabolic enzymes and antioxidant enzymes was also observed to be highest in groups supplemented with 40 mg zinc/kg feed. The overall results of the present study suggest the efficacy of dietary zinc on growth, survival and physiological response of golden mahseer fry in order to garner the possibility of establishing the species to commercial aquaculture
A report on the occurrence of Bangana dero (Hamilton, 1822) from Deepor beel (Ramsar site no. 1207), Brahmaputra valley, Assam
No full textDeepor beel (Latitude: 26°05?26??N to 26°09?26?? N; Longitude: 90°36\u27 E to 90°41?25?? E) located in Kamrup district, Assam is a large (water spread area of 589 ha) natural wetland and a Ramsar site of international importance (Site number 1207 declared in 2002) having enormous biological and environmental importance. The wetland receives water from surface run-off as well as from two hill streams (Basistha and Kalamoni) and drains into River Brahmaputra, through a small rivulet (Khanajan). The beel supports a number of endemic endangered and threatened animals and plants that are included under IUCN red-list. Past studies indicated the occurrence of 67 fin-fish species in the beel. In a recent survey conducted by us, the beel Bangana dero (Synonyms: Cyprinus dero/ Labeo dero), a cyprinid fish, was collected for the first time from the beel. We collected as many as 28 specimens of B. dero from the beel during October 2016. The total length of the reported specimens ranged from 8.77 - 10.14 cm and weight ranged from 6.74 - 10.61 g. The length-weight relationship of the species was worked out as W = 0.074*L2.103. B. dero reportedly inhabits upland rivers, torrential hill-streams; adults migrate to warm downstream regions during the winter season (December-February). Thus, the occurrence of this species in Deepor beel indicates its possible downstream migration from one or both the feeder rivers (Basistha and Kalamoni) or migration from Brahmaputra River through its connecting channel. 
Barilius torsai (Teleostei: Cypriniformes: Cyprinidae), a new freshwater fish from the Brahmaputra drainage, India
No full textBarilius torsai is described from the Torsa, a tributary of Brahmaputra River system in West Bengal, India. The new species is distinguished from all its congeners by the presence of a complete lateral line with 52–53 scales, 29 pre-dorsal scales, pectoral fin notched, two well-developed pairs of barbels (rostral and maxillary), length of rostral barbel slightly larger than maxillary, which reaches the orbit. Tubercles on snout and lower jaw absent, 9–11 blue vertical bars along the body, dorsal fin hyaline with dark pigment concentrated along lower two-third of the dorsal-fin rays
Not Available
No full textNot AvailableAnalysis of long-term (1987-2019) fish landing data showed that an average
191.93 t year-1 of fish landed at Uzanbazar (Guwahati) landing center of
River Brahmaputra. The total landings registered peak landings of 471.8 t in
2002 and thereafter it declined to the lowest levels of 84.06 t in 2016. Fish
landings suffered changes in the qualitative and quantitative aspects of River
Brahmaputra fishery in Assam. Whereas average total landings during last
decade declined by almost 60% as compared to the average landings of 234.97 t
year-1 in the previous two decades (1987-2009), the contribution of Indian major
carps (IMC) and minor carps towards total landings declined from 17.54% and
35.11% during 1987-2009 to only 4.86% and 8.94%, respectively during 2010-
2019. Miscellaneous fishes group emerged as dominant group contributing
58.28% of the average landings in last decade (54.30 t year-1) compared to
69.38 t year-1 during 1987-2009. Average landing of catfishes also decreased
from 26.96 t year-1 in 1987-2009 to 19.77 t year-1 in 2010-2019, but percentage
contribution increased from 11.47% to 21.28% over decades. Similarly, average
landings of Hilsa declined from 8.24 t year-1 to 3.42 t year-1 but percentage
contribution remained unchanged over the period. Such changes can be partly
ascribed to climate change, habitat modification, over exploitation and other
anthropogenic causes. The sharp decline in IMC landings as well as changes in
landing composition from the river due to these alterations in the last decade
is directly affecting the livelihood of the fishermen community.Not Availabl
Not Available
No full textNot AvailableMicroplastics are a common contaminant that has been found in almost all aquatic environments, which poses a hazard to the aquatic ecosystem. Direct discharges of microplastics into the environment occur from a variety of sources and accumulate pollutants from the surrounding environment, which later affect living organisms mostly by ingestion. Biomagnification and
trophic transfer are the two major possible ways for microplastics to enter humans. Microplastic pollution has gained attention in recent years, which has increased understanding of its impacts on living organisms. This article focuses on the sources, characteristics and impacts of microplastics on the aquatic ecosystem and also discusses mitigation measures for microplastic pollutionNot Availabl
