Abstract:
The importance of open water fish in our socio-economic regime has recemly drawn the
attention of the policy makers of the country. FCDIFCDI projects mainly serve the
agricultural interests, but it interfere fish migration, This inevitably affects the open water
fisheries sector as migratory routes. Nursing grounds of many species of fish are
hampered and disturbed for these projects also.
In order to permit fish migration in rivers, it is necessary to maintain conditions that help
migrants reach their spawning grounds. To overcome obstacles, such as hydraulic
structures, placed in the path of migrating fish, structures must be designed to assist lhe
fish to pass them. The periodic and directed travel of fish mainly for fceding, breeding
and over coming adverse climatic conditions is called migration !'ish passes are
constructed to allow normal breeding migration and to ensurc natural route of fish
movement.
The concept ofa fish passes is relatively new in Bangladesh. At present, two Fish passes
and two fish friendly structures are constructed These are Fish Pass in Jamuna to Bangali
River at Sariakandi in Bogra, fish Pass in Kawadighi Haor of Monu river in
Moulovibazar, fish friendly structure in Lohajong river of Tangail and fish friendly
structure at Morichardanra in Chapainawabganj.
Fish fry, spawning and hatchling movement from Jamuna to Bangali River was the main
objective of Sariakandi Fish Pass Project. The Fish Pass Project of Sariakandi is
necessary for the development of the dominant fishes like catfish and small fishes. The
structures will also aid in efficient development of the carp fishes. Syawlling migration,
mainly in carp fish, in the study area was found to begin at the 2" week of May and
continue up to the 3,d week of July. Catfish migrations began at the last week of March
and continue up to the 2nd week of June. .
Seasonal variation was found in four periods of fish migration; firstly over-wintering or
dry season migration, in this period the large size carps and small catfish especially
Magur and Shing showed peak migration. Secondly spawning migration season, small
size catfishes showed peak migration. Thirdly nursery/ grow out migration season, carps,
catfishes and other fishes showed peak migration during this season. And fourthly flood
recession migration season, large size carps and catfishes also showed peak migration
