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dredges

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    NIWA conducted a survey to assess the scallop abundance within Block B in the interim AMA in Golden Bay. A random dredge survey (15 tows) was carried out to quantify relative abundance of scallops within Block B, AMA 1 on 27th March 2014, using two scaled-down commercial scallop dredges. Results showed that the scallop densities in 2014 were similar to previous surveys and did not indicate a substantial recovery of the fishery at the present time.

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    Seabed sampling of the nearshore region of the STB was conducted during a 3-day field survey undertaken from the 28th February to the 2nd March 2013. Seabed habitats were characterised at 36 sites (26 nearshore sites and 10 cross-shelf sites), using underwater video footage and still images (photo-quadrats). Representative habitats were then sampled using a benthic grab for surficial sediments and a benthic dredge to collect surficial macrobenthic specimens. Ninety-two percent of the seabed along the nearshore region of the STB was characterised by extensive soft-sediments that supported few macrobenthic organisms. The remaining 8% of the seabed (five sites) comprised hard substratum in the form of either low to moderate relief hard rock (6%) or variable relief mudstone (2%) outcrops. In contrast to mudstone outcrops, which supported low or negligible amounts of macrobenthos, hard rock outcrops supported abundant and diverse assemblages, with the two dredges sampled at Site 5 and 6 accounting for more than 25% of all specimens and 61% of all species collected during the survey.