Role of tide and lunar phases on the migration pattern of juvenile Hilsa shad (Tenualosa ilisha) within a meso‐macrotidal estuary

Tide and lunar phases often influence the behaviour and life cycle of different fishes, especially migratory species. In the Hooghly River estuary, Hilsa shad is an anadromous fish species that migrates from the adjacent sea to the estuary and rivers for spawning. After spawning, the juveniles remai...

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Bibliographic Details
Published in:Journal of fish biology 2022-04, Vol.100 (4), p.988-996
Main Authors: Giri, Sandip, Chanda, Abhra, Maity, Sourav, Chakraborty, Kunal, Hazra, Sugata
Format: Article
Language:English
Subjects:
Anadromous fishes
Anadromous species
Animals
Catadromous migrations
Downstream
Estuaries
Estuarine dynamics
Fish
Fishes
Freshwater fishes
High tide
Hilsa
Hooghly River estuary
juvenile Hilsa shad
Juveniles
Life cycle
Life cycles
Low tide
lunar phase
Lunar phases
migration
Migratory species
Moon
Moon phases
Rivers
Seafood
Spawning
tide
Tides
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Summary:Tide and lunar phases often influence the behaviour and life cycle of different fishes, especially migratory species. In the Hooghly River estuary, Hilsa shad is an anadromous fish species that migrates from the adjacent sea to the estuary and rivers for spawning. After spawning, the juveniles remain in the rivers and estuary for few months then start their downstream migration towards the adjacent sea. However, the pattern of their downstream migration has not been studied in detail so far. This study investigates the role of tide and lunar phases on the juvenile Hilsa shad migration pattern. In this study, we have estimated the rate of juveniles migrating through the river channel (no. m−2 h−1) during high tide and low tide in all of the lunar phases. The number of juvenile Hilsa shad fishes is found to be much higher during low tides in most of the observations and there is a significant difference (t = 11.904, P 
ISSN:0022-1112
1095-8649
DOI:10.1111/jfb.15003