"Until and unless we study about the carrying capacity of the rivers, we will not be in favour of granting any permission for marinas. It is not advisable to allow such projects to be set up on piecemeal basis," Noronha told PTI.
The GSPCB chairman's statement comes a day after local fishermen and members of Legislative Assembly - Alina Saldanha and Vishnu Surya Wagh expressed their resentment against the proposed marinas.
Noronha said they have rejected applications in the past for setting up marinas at Sancole on the grounds that it is hazardous for bio-diversity of the area.
Under the proposed marina project small crafts and ships will be anchored alonside the river bed.
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"We had received similar proposals in past but there were certain apprehensions about the bio-diversity of the particular area," he added.
The board has already asked state environment ministry to conduct study on the carrying capacity of rivers, which will determine the possibility of setting up such projects.
Traditionally, fishermen have been harvesting fish varieties, including oysters.
Fishermen said they had exclusive rights to the seabed and the marinas will damage their business.
"Our opposition is not for the sake of opposing. We have a valid reason for it. Once you set up marinas at Sancoale and Nauxi, the entire river bed would be polluted. The fishing activity will cease to exist," Agnelo Rodrigues, a leader of fishermen community, said.
Rodrigues claimed that there are at least 1,000 fishermen who earn their living from the river bed.