Performance of Indian and vietnamese strain of Anabas testudineus under captive condition in the lower Brahmaputra Valley zone of Assam

2020 ◽  
Vol 9 (si) ◽  
pp. 236-243
Author(s):  
A K Borah ◽  
J Thakuria ◽  
D Debnath ◽  
D Nath
Keyword(s):  
Anabas Testudineus ◽  
Brahmaputra Valley ◽  
Vietnamese Strain ◽  
Captive Condition

ẢNH HƯỞNG CỦA ĐỘ MẶN ĐẾN QUÁ TRÌNH ƯƠNG CÁ RÔ ĐẦU VUÔNG (Anabas testudineus Bloch, 1792)

2015 ◽  
Vol 104 (5) ◽  
Author(s):  
Trần Nguyên Ngọc ◽  
Lê Văn Dân
Keyword(s):  
Anabas Testudineus

Nghiên cứu được tiến hành trên cá Rô đầu vuông ở Trung tâm giống thủy sản nước ngọt cấp I – Thừa Thiên Huế với mục tiêu xác định ảnh hưởng của các nồng độ muối khác nhau đến quá trình ương từ đó có thể chủ động cung cấp nguồn giống cá Rô đầu vuông có khả năng phát triển bình thường trong môi trường rộng muối, góp phần đưa loài cá này trở thành đối tượng nuôi nước lợ, làm đa dạng hóa đối tượng nuôi ở vùng nước lợ đầm phá tỉnh Thừa Thiên Huế. Thí nghiệm được bố trí ngẫu nhiên hoàn toàn gồm 8 nghiệm thức có nồng  độ muối là 0‰, 3‰, 5‰, 7‰, 9‰, 11‰, 13‰, 15‰ với 3 lần lặp lại. Kết quả cho thấy, độ mặn ảnh hưởng đến quá trình ương của cá Rô đầu vuông, trong đó ở mức độ mặn 0‰ và 5‰ , cho tỷ lệ sống và tốc độ sinh trưởng cao nhất. Đặc biệt ở mức đô mặn 5‰  đạt kết quả tối ưu sau 30 ngay ương và có sự sai khác thống kê (P <0,05) so với các mức độ mặn 3‰, 7‰, 9‰, 11‰, 13‰, 15‰. Các yếu tố môi trường đều nằm trong khoảng giới hạn, thích hợp cho sự sinh trưởng và phát triển cá Rô đầu vuông. Từ khóa: Cá Rô đầu vuông, độ mặn, tỷ lệ sống, tốc độ sinh trưởng

Assessment of genetic variability amongst cultivated populations of Khasi mandarin (Citrus reticulata Blanco) detected by ISSR

2021 ◽  
pp. 1-11
Author(s):  
Karishma Kashyap ◽  
Rasika M. Bhagwat ◽  
Sofia Banu
Keyword(s):  
Genetic Diversity ◽  
Genetic Variability ◽  
Inter Simple Sequence Repeat ◽  
Northeast India ◽  
Issr Markers ◽  
Citrus Reticulata ◽  
Brahmaputra Valley ◽  
Indian Food ◽  
Cultivated Populations ◽  
High Level

Abstract Khasi mandarin (Citrus reticulata Blanco) is a commercial mandarin variety grown in northeast India and one of the 175 Indian food items included in the global first food atlas. The cultivated plantations of Khasi mandarin grown prominently in the lower Brahmaputra valley of Assam, northeast India, have been genetically eroded. The lack in the efforts for conservation of genetic variability in this mandarin variety prompted diversity analysis of Khasi mandarin germplasm across the region. Thus, the study aimed to investigate genetic diversity and partitioning of the genetic variations within and among 92 populations of Khasi mandarin collected from 10 cultivated sites in Kamrup and Kamrup (M) districts of Assam, India, using Inter-Simple Sequence Repeat (ISSR) markers. The amplification of genomic DNA with 17 ISSR primers yielded 216 scorable DNA amplicons of which 177 (81.94%) were polymorphic. The average polymorphism information content was 0.39 per primer. The total genetic diversity (HT = 0.28 ± 0.03) was close to the diversity within the population (HS = 0.20 ± 0.01). A high mean coefficient of gene differentiation (GST = 0.29) reflected a high level of gene flow (Nm = 1.22), indicating high genetic differentiation among the populations. Analysis of Molecular Variance (AMOVA) showed 78% of intra-population differentiation, 21% among the population and 1% among the districts. The obtained results indicate the existence of a high level of genetic diversity in the cultivated Khasi mandarin populations, indicating the need for preservation of each existing population to revive the dying out orchards in northeast India.

Do the Heterogeneous Determinants of Repayment Affect Differently across Borrowers of Diverse Credit Sources in Rural Assam? A Double Hurdle Approach

2021 ◽  
pp. 245513332110316
Author(s):  
Tiken Das ◽  
Pradyut Guha ◽  
Diganta Das
Keyword(s):  
Rural Areas ◽  
Probit Model ◽  
Original Data ◽  
Community Based ◽  
Data Set ◽  
Brahmaputra Valley ◽  
Double Hurdle ◽  
Instrumental Variable Probit ◽  
Instrumental Variable Probit Model

This study made an attempt to answer the question: Do the heterogeneous determinants of repayment affect the borrowers of diverse credit sources differently? The study is based on data collected from 240 households from three districts in the lower Brahmaputra valley of Assam through a carefully designed primary survey. Besides, the study uses the double hurdle approach and the instrumental variable probit model to reduce possible selection bias. It observes better repayment performance among formal borrowers, followed by semiformal borrowers, while occupation wise it is prominent among organised employees. It has been found that in general, the household characteristics, loan characteristics and location-specific characteristics significantly affect repayment performance of borrowers. However, the nature of impact of the factors influencing repayment performance is remarkably different across credit sources. It ignores the role of traditional community-based organisations in rural Assam while analysing the determinants of repayment performance. The study also recommends for ensuring productive opportunities and efficient market linkages in rural areas of Assam. The study is based on an original data set that has specially been collected to examine question that—do the heterogeneous determinants of repayment affect the borrowers of diverse credit sources differently in the lower Brahmaputra valley of Assam—which has not been studied before.

Optimization of temperature improves embryonic development and hatching efficiency of false clown fish, Amphiprion ocellaris Cuvier, 1830 under captive condition

Aquaculture ◽  
2021 ◽  
Vol 536 ◽  
pp. 736417
Author(s):  
Misha Soman ◽  
Narinder Kumar Chadha ◽  
K. Madhu ◽  
Rema Madhu ◽  
Paramita Banerjee Sawant ◽  
...  
Keyword(s):  
Embryonic Development ◽  
Captive Condition

scholarly journals Isolation and characterization of two virulent Aeromonads associated with haemorrhagic septicaemia and tail-rot disease in farmed climbing perch Anabas testudineus

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Abhishek Mazumder ◽  
Hrishikesh Choudhury ◽  
Abhinit Dey ◽  
Dandadhar Sarma
Keyword(s):  
Natural Infection ◽  
Winter Season ◽  
Pcr Amplification ◽  
Body Parts ◽  
Anabas Testudineus ◽  
Climbing Perch ◽  
Isolation And Characterization ◽  
Biochemical Characterisation ◽  
Rot Disease

AbstractDiseased Anabas testudineus exhibiting signs of tail-rot and ulcerations on body were collected from a fish farm in Assam, India during the winter season (November 2018 to January 2019). Swabs from the infected body parts were streaked on sterilized nutrient agar. Two dominant bacterial colonies were obtained, which were then isolated and labelled as AM-31 and AM-05. Standard biochemical characterisation and 16S rRNA and rpoB gene sequencing identified AM-31 isolate as Aeromonas hydrophila and AM-05 as Aeromonas jandaei. Symptoms similar to that of natural infection were observed on re-infecting both bacteria to disease-free A. testudineus, which confirmed their virulence. LC50 was determined at 1.3 × 104 (A. hydrophila) and 2.5 × 104 (A. jandaei) CFU per fish in intraperitoneal injection. Further, PCR amplification of specific genes responsible for virulence (aerolysin and enterotoxin) confirmed pathogenicity of both bacteria. Histopathology of kidney and liver in the experimentally-infected fishes revealed haemorrhage, tubular degeneration and vacuolation. Antibiotic profiles were also assessed for both bacteria. To the best of our knowledge, the present work is a first report on the mortality of farmed climbing perch naturally-infected by A. hydrophila as well as A. jandaei, with no records of pathogenicity of the latter in this fish.

Sign in / Sign up

Export Citation Format

Share Document