Publications: Peer-reviewed journal articles (by staff)

Broodstock conditioning of New Zealand geoduck (Panopea zelandica) within different temperature and feeding ration regimes

  • Le DV,
  • Alfaro AC,
  • and King N
1 January, 2014
CITATION

Le DV, Alfaro AC, King N 2014. Broodstock conditioning of New Zealand geoduck (Panopea zelandica) within different temperature and feeding ration regimes. New Zealand Journal of Marine and Freshwater Research. Volume 48, Issue 3. Pages 356-370.

ABSTRACT

Two-year-old New Zealand geoducks (Panopea zelandica) were conditioned within combinations of three water temperatures (7–8, 11–12 and 16–17 °C) and three feeding rations (10,000, 50,000 and 100,000 cells mL−1 of Chaetoceros mulleri and Isochrysis galbana) for 73 days. Similar percent matured and dry condition index values were observed among temperatures. However, significantly higher dry gonadosomatic indices (GSIdw) were recorded at 8 and 12 °C. Although no difference was detected in percentage of spawned individuals and connective tissue occupation indices, a higher percent matured were recorded when fed 10,000 and 50,000 cells mL−1. A reference group conditioned in pond water became matured 2 months later than the other nine experimental groups, but GSIdw were similar. To maximise reproductive output, we suggest that 2-year-old P. zelandica may be conditioned in pond water for a month and then in 8 or 12 °C seawater with 50,000 cells mL−1.