Dear Alan This is what I was thinking about the red tide at 04h00 this morning..... Maybe it is due to the seismic survey ship - which has chased the whales away. The red tide is caused by phytoplanktons which feed on nutrient rich water. The whales would have eaten the nutrients but because they were chased away the phytoplanktons moved in. OR the seismic survey released the blooms of the phytoplanktons which then just carried on multiplying. I am sure there is some link between … [Read more...] about What caused the recent Red Tide in Algoa Bay?
seismic survey
Whales receive ONE day of peace and quiet
After halting the seismic survey in Algoa Bay on Thursday peace an quiet descended upon our marine neighbours for a day, only for permission to be given for the seimic survey to begin again lat on Friday afternoon. The call of the blue whale reaches levels up to 188 decibels. This extraordinarily loud whistle can be heard for hundreds of miles underwater. Theoretical calculations by Roger Payne and Douglas Webb (from the 1970's) predicted that the loudest whale sounds might be transmitted … [Read more...] about Whales receive ONE day of peace and quiet
Seismic Survey begins in Algoa Bay
The Motor Vessel Polarcus Nadia begins conducting a 3D Seismic Survey offshore Algoa Bay, Port Elizabeth today, 10 December 2013. The 3D survey Vessel will be towing a configuration of ten streamer cables each of 6 km length spaced 100 meters apart at an average depth of 10 m astern of the vessel. The streamers are not visible on the surface. Operational area stretches across the bay from inline with the from Gamtoos River Mouth to Bird Island. The vessel has restricted manoeuvrability … [Read more...] about Seismic Survey begins in Algoa Bay
