Local fishermen around the river Halda, the biggest and sole natural spawning ground for the country’s indigenous carp species, termed the amount of spawn released yesterday as “poor”.
The little amount of spawn released was found around three bends of the river — Napiter Gona, Garduara and Madunaghat areas in Chittagong’s Hathazari upazila, they said.
On average each fisherman gets at least two kilogrammes of spawn during the initial days of the spawning season while yesterday it was barely half a kilogramme, they added.
With torrential downpour continuing for the last two days, around 500 boats were ready to collect spawns but their hopes were not fulfilled, said a Department of Fisheries officer of Raojan upazila.
Experts, however, hoped for the better in the coming days.
Fishes release fertilised eggs between April and June (Boishakh, Joistho and Ashar in Bangla months) in favourable water temperatures, river current, rain and thunder, said Halda expert Prof Manzoorul Kibria of Chittagong University.
The fish might spawn in full swing in the upcoming full moon or the dark phase of the moon, he said.
After collecting the fertilised eggs of fishes like Ruhi, Katla, Mrigel and Kaliboush, the fishermen nurture those first in hatcheries and then bring those up in ponds and lakes, said Kibria.
Starting off in the Chittagong Hill Tracts, the river Halda passed though Chittagong’s Hathazari, Raozan and Fatikchhari upazila before ending up in the Karnaphuli river.