Study hopes to solve riddle of falling prawn numbers

A RESEARCH project looking at reasons behind declining school prawn numbers on the North Coast is under way in the Camden Haven Estuary, south of Port Macquarie.

It is thought declining catches could relate to poor water quality and the loss of habitat, a situation that is reported in other estuaries on the North Coast, especially the Richmond.

DPI senior research scientist Dr Matt Taylor said the project would determine whether school prawns were still recruiting to certain areas of the estuary and if water conditions were adversely affecting prawn growth and survival.

"We know from previous reports that the periodic presence of environmental conditions such as low dissolved oxygen, low pH and the occurrence of heavy metals can have deadly effects on prawns," Dr Taylor said.

"These conditions can occur in estuarine waters as a by-product of acid-sulphate soil oxidation.

"However, sub-lethal effects from degraded environmental conditions that compromise growth and reproduction are largely unknown for prawns."



Possible links between grisly animal deaths

Premium Content Possible links between grisly animal deaths

POLICE said it was not immediately obvious what the corpses were.

Town’s ‘unofficial sheriff’ sees error of his ways

Premium Content Town’s ‘unofficial sheriff’ sees error of his ways

“THAT day I had a gutful a number of things; I was drunk... it was this fantasy...

COVID-19 testing needs to increase to keep virus at bay

Premium Content COVID-19 testing needs to increase to keep virus at bay

Local health boss wants testing to increase from 1,345 to 3,500 during the school...