Biology and fisheries of Hilsa shad in Bay of Bengal

Hossain, Mostafa Ali Reza; Das, Isha; Genevier, Lily; Hazra, Sugata; Rahman, Munsur; Barangé, Manuel; Fernandes, José António

doi:10.1016/j.scitotenv.2018.10.034

Cited by 49 publications

(38 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The calculated ages and corresponding age groups determined in the present study are in agreement with those described by [33] who estimated the age of hilsa using length frequency analysis to be between 2-6 years using a population in which 90% were between 25-75 cm in length. The length and weight at age findings obtained in the present study (except for those collected from the Kali River and Gaglajur Haor) support the results presented in [34] from hilsa from Indian water.…”

Section: Discussionsupporting

confidence: 90%

Full title:Age analysis and growth patterns ofTenualosa ilishausing otolith examination and length-weight relationships from different regions of Bangladesh

Ahmed

Ahammad

Shahjahan

et al. 2018

Preprint

View full text Add to dashboard Cite

Conceptualization, A.K.S.A.; supervision, A.K.S.A.; methodology, M.B.U.A.; manuscript 18 editing, M.S.; sample collection, B.K.D; data arrangement, M.F.R; investigation, M.A.A.; 19 funding acquisition, A.B.; writing -original draft preparation, M.B.U.A.; writing -review and 20 editing, M.A.A.; project administration, Y.M. 2 21 Abstract 22The assessment of age and growth patterns provides crucial information on numerous 23 aspects of the population dynamics in fish, which can, in turn, be used to determine a 24 sustainable fishing rate and inform effective resource management practices. However, 25 studies on the age and growth pattern of Tenualosa ilisha (commonly referred to as hilsa) are 26 plagued by a lack of essential information; addressing this data gap is the aim of the present 27 study. Six diverse habitats across Bangladesh were chosen as sampling sites for hilsa 28 collection. For age determinations, the lunar rings in the otolith of the hilsa fish that are 29 periodically-deposited in accordance with the lunar cycle were used to reflect 14-day 30 increments of time. The length and weight of each fish were recorded prior to otolith 31 extraction. The resulting otoliths were polished to enable the visualization and quantification 32 of their lunar rings with a high-magnification microscope. Except for the Kali River and 33 Gaglajur Haor samples, the age of the fish correlated strongly with both their length and 34 weight (r > 0.95; p < 0.05). Again, aside from those from the Kali River and Gaglajur Haor, 35 all of the samples exhibited positive allometric growth patterns (b > 3) with the fish from the 36 Tetulia River being the most positive (b = 3.48). The causes these variations are not yet 37 clearly understood, however; the nutrient availability, environmental variation, and genetic-38 environmental interactions are likely contributors to the diversities displayed by the hilsa 39 from different regions of Bangladesh.40 41

show abstract

Section: Discussionsupporting

confidence: 90%

Full title:Age analysis and growth patterns ofTenualosa ilishausing otolith examination and length-weight relationships from different regions of Bangladesh

Ahmed

Ahammad

Shahjahan

et al. 2018

Preprint

View full text Add to dashboard Cite

show abstract

“…All of the spawning grounds of Hilsa shad were identi ed in the coastal areas of Bangladesh especially at the lower stretches of the Meghna, the Tetulia, the Ander Manik and the Shahabazpur River e.g., Hatia (Moulavir char) Sandwip (Kalir char) and Bhola (Dhal char and Monpura) 6,21 . However, migratory plan is mainly initiated during the spawning season, which is activated with follow of fresh water runoff from the inland rivers, and naturally it occurs with the commencement of the south-west monsoon and consequent ooding of all the major rivers draining down to the upper Bay of Bengal and there are no considerable differences in any context.…”

Section: Discussionmentioning

confidence: 99%

“…They drawn several speci c populations or clusters in the upper streams of Bangladesh, however, this shad is not found in the freshwater all over the year round. All of the spawning grounds of this shad were discovered in the lower stretches of the Meghna River and some other small coastal rivers situated almost in the same area 6,21 . Moreover, as a highly migratory species, Hilsa shad population should not able to make different clusters in their migratory routes.…”

Section: Introductionmentioning

confidence: 85%

Existence of a Single Population of Hilsa Shad (Tenualosa Ilisha) With Low Genetic Variation in Bangladesh Waters Revealed by Cross-Species Gene Enrichment Method 

Sarker¹,

Naher²,

Huang³

et al. 2020

Preprint

View full text Add to dashboard Cite

Tenualosa ilisha is a popular anadromous and significant trans-boundary fish. For sustainable management and conservation of this fish, drawing an appropriate picture reflecting population status of this species is very essential based on their all-strategic habitats in Bangladesh. In this study, 139 samples from 18 sites were collected and cross-species gene enrichment method was applied to discover the exact population status of the fish. Like most of the Clupeiforms, nucleotide diversity and variation of this shad were very low. Population differences between most of the locations were low and not significant. However, P values of a few locations were significant (P< 0.05) but their pairwise FST values were very poor, which is inadequate to recognize any local populations. Structure analysis, PCA and maximum likelihood IQtree all indicated the presence of a single population in the Bangladesh water with some admixture individuals, which may contain partial genes from other populations. In the ML IQtree and Network, most of the individuals were mixed without showing any precise grouping, which might due to their highly migratory nature. Fishes from special type of habitats, e.g., haors, small coastal rivers etc. were not unique and no genetic differences between migratory cohorts were found.

show abstract

“…The Hilsa catch was also significantly higher during the easterly winds (as depicted by the modeled outputs). Approximately 80%–85% of the global Hilsa catch is found in the coastal waters of Bangladesh and Myanmar (Hossain et al, ). Since Hooghly estuary is situated in the west of the Bangladesh waters, downwelling easterly winds may serve as physical forcing influencing more Hilsa to move toward the Hooghly estuary, hence the high observed catches.…”

Section: Discussionmentioning

confidence: 99%

Role of lunar phases, rainfall, and wind in predicting Hilsa shad (Tenualosa ilisha) catch in the northern Bay of Bengal

Giri

Hazra

Ghosh

et al. 2019

Fisheries Oceanography

Self Cite

View full text Add to dashboard Cite

Hilsa (Tenualosa ilisha) is an important commercial fish in India. This study investigates relationships among Hilsa catch per unit effort (CPUE) and the corresponding lunar phase, rainfall variability, wind vector, and month in the northern Bay of Bengal. Hilsa catch during the monsoon season of three consecutive years (2013–2015) was analyzed by using a Generalized Least Square model with lunar phase and monsoon months (June–September) as categorical variables and wind direction as circular variable. Significantly higher Hilsa catch was observed during the waning crescent and waxing gibbous lunar phases and during easterly winds. There was no significant effect of wind velocity. Daily rainfall was significantly correlated with Hilsa migration toward the estuary. Among the four monsoon months, September exhibited the most positive significant correlation with the Hilsa CPUE. Model predicted CPUE underestimated the actual CPUE in 2016 by 20%.

show abstract

Biology and fisheries of Hilsa shad in Bay of Bengal

Cited by 49 publications

References 32 publications

Full title:Age analysis and growth patterns ofTenualosa ilishausing otolith examination and length-weight relationships from different regions of Bangladesh

Full title:Age analysis and growth patterns ofTenualosa ilishausing otolith examination and length-weight relationships from different regions of Bangladesh

Existence of a Single Population of Hilsa Shad (Tenualosa Ilisha) With Low Genetic Variation in Bangladesh Waters Revealed by Cross-Species Gene Enrichment Method

Role of lunar phases, rainfall, and wind in predicting Hilsa shad (Tenualosa ilisha) catch in the northern Bay of Bengal

Contact Info

Product

Resources

About

Biology and fisheries of Hilsa shad in Bay of Bengal

Cited by 49 publications

References 32 publications

Full title:Age analysis and growth patterns ofTenualosa ilishausing otolith examination and length-weight relationships from different regions of Bangladesh

Full title:Age analysis and growth patterns ofTenualosa ilishausing otolith examination and length-weight relationships from different regions of Bangladesh

Existence of a Single Population of Hilsa Shad (Tenualosa Ilisha) With Low Genetic Variation in Bangladesh Waters Revealed by Cross-Species Gene Enrichment Method&nbsp;

Role of lunar phases, rainfall, and wind in predicting Hilsa shad (Tenualosa ilisha) catch in the northern Bay of Bengal

Contact Info

Product

Resources

About

Existence of a Single Population of Hilsa Shad (Tenualosa Ilisha) With Low Genetic Variation in Bangladesh Waters Revealed by Cross-Species Gene Enrichment Method