Successful Shellfish Survey Day at Whangateau Harbour

 

Sieving the sand out of the samples to enable the shellfish to be counted and measured.  Eagleray feeding holes filled with water were handy on the upper shore.  Without them samples would have to be carried several hundred metres to water for sieving

Sieving the sand out of the samples to enable the shellfish to be counted and measured. Eagleray feeding holes filled with water were handy on the upper shore. Without them samples would have to be carried several hundred metres to water for sieving

The annual survey of shellfish, particularly cockles, on two transects east of Horseshoe Island in the Whangateau Harbour, was successfully completed on Friday 28th March by ten students and several adult helpers. Mahurangi College science teacher Wendy Dunn organized the students into pairs for the task. As the shellfish beds in the Whangateau Harbour are currently closed, a special permit is required to carry out the surveys.

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Mangrove Seedling Removal Trial at Whangateau Harbour

Our band of seven (plus the photographer) with our sacks of seedlings

Our band of seven (plus the photographer) with our sacks of seedlings

Summary

A trial removal of mangrove seedlings was carried out at Whangateau Harbour on 12th October 2012.  An area of approximately two hectares was cleared in the southern arm of the Harbour (Waikokopu Creek) south of the causeway to Omaha and on the eastern side of the Harbour.  Details of the trial area and actual area cleared are shown in the maps below.  The rate of clearance appeared to be approximately one hectare per 10 people per hour.  To effectively clear, and maintain clear, the appropriate area of mangrove seedlings south of the causeway by these methods would take approximately 500 to 700 volunteer hours annually.
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Vietnam’s mangroves trees threatened by rising tide of deforestation

Clearances could contribute to coastal erosion and prove a missed opportunity to prevent climate change

Vietnam’s Mangroves

Alisa Tang