Carry-Over Effects of Broodstock Conditioning on the Salinity Tolerance of Embryos of the New Zealand Geoduck (Panopea zelandica)

The New Zealand geoduck (Panopea zelandica) has seen considerable interest from the NZ aquaculture industry. A major bottleneck in culturing P. zelandica is early life stages mortality (e.g., embryo). Therefore, in this study, we investigated the embryonic performance and their transition to the fir...

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Bibliographic Details
Published in:Aquaculture research 2024-05, Vol.2024 (1)
Main Authors: Sharma, Shaneel S., Alfaro, Andrea C., Ragg, Norman L. C., Zamora, Leonardo N.
Format: Article
Language:English
Subjects:
Abnormalities
Algae
Aquaculture
Aquaculture industry
Biological fertilization
Breeding stock
Conditioning
Developmental stages
Diatoms
Diet
Eggs
Embryonic development
Embryos
Environmental stress
Feeding
Females
Fertilization
Gametogenesis
Health aspects
International economic relations
Larvae
Larval stage
Offspring
Panopea zelandica
Ratios
Salinity
Salinity effects
Salinity tolerance
Seawater
Sperm
Success
Survival
Veligers
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Summary:The New Zealand geoduck (Panopea zelandica) has seen considerable interest from the NZ aquaculture industry. A major bottleneck in culturing P. zelandica is early life stages mortality (e.g., embryo). Therefore, in this study, we investigated the embryonic performance and their transition to the first feeding larval stage (D-veliger) under different salinities (26, 30, 32, and 35 ppt) of four different offspring groups generated from broodstock being fed different ratios (25 : 75, 50 : 50, 60 : 40, and 75 : 25) of the haptophyte Tisochrysis lutea (formerly Isochrysis galbana) (ISO) and the diatom Chaetoceros muelleri (CM) during gametogenesis. Broodstock within all diet ratio treatments successfully conditioned, producing viable embryos. Average egg size ranged between 75 and 80 µm and was not affected by the diet ratios of the broodstock. Survival 48 hr postfertilization, D-veliger larvae yield, and incidence of abnormalities depended on both the embryo rearing salinity and broodstock feeding ratios. The combined salinity of 32−35 ppt and a feeding ratio of 50 : 50 and 60 : 40 (ISO:CM) had the highest survival of embryos (56.0%–77.5%), highest production of D-veliger larvae (>65%), and lowest incidence of abnormalities within D-Veliger (
ISSN:1355-557X
1365-2109
DOI:10.1155/2024/8875557