A report on the occurrence of Bangana dero (Hamilton, 1822) from Deepor beel (Ramsar site no. 1207), Brahmaputra valley, Assam

Deepor beel (Latitude: 26°05?26??N to 26°09?26?? N; Longitude: 90°36' 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.&nbsp

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Not AvailableIn India, the area under reservoir fisheries was estimated at about 4.03 million ha with over14,000 reservoirs. The area of small reservoirs( 5000 ha) in India is estimated to be 2.25 million ha. There are a total of 20 small reservoirs in 8 states of NE with an area of 3390.93 ha. The state has 6 medium reservoirs covering an area of 15598.34 ha. The region does not have any large reservoirs.Not Availabl

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Not AvailableA study was carried out to analyse and compare population parameters of Hilsa shad, Tenualosa ilisha from three geographically isolated populations residing in three different tropical aquatic ecosystems of India. Monthly sampling was carried from September 2017 to February 2019 and 671 Hilsa specimens were collected in total from Brahmaputra river (n=88), Narmada estuary (n=326) and Ukai reservoir (n=257). Length-weight relationship study showed b value of 2.959, 3.093 and 3.129 for Brahmaputra, Narmada and Ukai respectively. Value of condition fac tor (K) ranged from 0.8813-0.9908 and that of relative condition factor (Kn) ranged from 1.0016-1.0099 with lowest values obtained from Ukai reservoir in both cases.Not Availabl

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Deepor beel (Latitude: 26°05ʹ26ʹʹN to 26°09ʹ26ʹʹ N; Longitude: 90°36' E to 90°41ʹ25ʹʹ 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) hav ing 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

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Not AvailableAn attempt was made to establish association pattern between dimension of fish and otolith to expedite morphometric variations of geographically isolated stocks of Tenualosa ilisha (Hamilton, 1822), from three diverse ecosystems; viz., an estuarine (brackish water), a riverine (freshwater) and a lacustrine (freshwater) ecosystem. Sampling was carried out during the period from September 2017 to February 2019 and a total of 196 otoliths were sampled from Narmada Estuary (n=69), Brahmaputra River (n=75) and Ukai Reservoir (n=52) of India. Mean otolith length recorded was 3.55±0.14 mm, 5.18±0.09 mm and 3.85±0.07 mm for samples collected from Narmada Estuary, Brahmaputra River and Ukai Reservoir respectively. Otolith length-weight relationship (OLWR) from three ecosystems showed negative allometric b values ranging from 1.9046-2.5048, with significant difference between Narmada Estuary and Brahmaputra River (p0.6); except for relationship between otolith width (OB) and TL in samples from Brahmaputra River (R2=0.459). Present study provides first-hand information on association pattern of dimension of fish body and otolith of T. ilisha which can be used in geographical mapping of stock profile of the species.Not Availabl

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Not AvailableThe present study was conducted in 13 earthen ponds measuring 0.1 ha for 3 months to study the efficacy of different doses of pig dung i.e. 4,000 kg ha-1 , 6,000 kg ha-1 , 8,000 kg ha-1 and 10,000 kg ha-1 on growth performance and survival of Indian major carps. Supplementary feed was used twice daily @ 3% body weight per day for entire experiment. Water quality parameters in all the experimental ponds (T1, T2, T3 and T4) were within normal range except for turbidity which showed higher values. Abundance of plankton groups among the treatments did not differ significantly. Highest abundance of phytoplankton (48.32 ± 6.32 x 10 6 Nos./l) and zooplankton (688.81 ± 75.47 Nos./l) was observed in T4. Survival rate of Catla (75 ± 1.12), Rohu (71.66 ± 1.54) and Mrigal (65.83 ± 1.23) was found to be highest in T1. Highest production (5354.0±167.37 kg ha-1 yr-1) was observed in T3.Not Availabl