Larval and early juvenile culture of two giant clam (Tridacninae) hybrids

Thane A Militz; Richard D Braley; David S Schoeman; Paul C Southgate

doi:10.1016/j.aquaculture.2018.10.050

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Larval and early juvenile culture of two giant clam (Tridacninae) hybrids

Journal article

Peer reviewed

Larval and early juvenile culture of two giant clam (Tridacninae) hybrids

Thane A Militz, Richard D Braley, David S Schoeman and Paul C Southgate

Aquaculture, Vol.500, pp.500-505

2019

DOI: https://doi.org/10.1016/j.aquaculture.2018.10.050

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Abstract

tridacna noae

tridacna maxima

hybridization

hybrid performance

hatchery culture

aquarium trade

The capacity for inter-specific hybridisation to yield improvements in animal production has long been realised in the aquaculture sector. However, the extension of hybridisation to improve production of giant clams (Tridacninae) has received little research attention. Aquaculture production of giant clams is directed primarily at aquarium markets, and hybridisation offers an opportunity to diversify available products. Here we report on the successful inter-specific hybridisation of Tridacna maxima and T. noae, and assess hybrid performance during hatchery culture. Both maternal and paternal hybrid crosses of T. maxima/T. noae yielded competent larvae. Fertilisation success was significantly lower (40.7±3.2%) for the T. maximaâ™€/T. noaeâ™‚ cross compared to the T. noae â™€/T. maximaâ™‚ cross (89.3±1.8%; χ2=154.03, P & 0.01). Despite the disproportionate fertilisation success, the two hybrids had similar survival curves (survival=2.03×days-2.08, r2=0.67, P=0.13) for the first 30 days of culture. Antero-posterior shell growth (APM) was superior in the T. maximaâ™€/T. noaeâ™‚ hybrid (APM=10(2.158+0.019×days)) when compared to the T. noaeâ™€/T. maximaâ™‚ hybrid (APM=10(2.169+0.016×days)) over the same time frame (r2=0.92, P & 0.001). Both survival and growth of the hybrids exceeded that reported in the literature for pure-strain hatchery culture of giant clam species. This suggests capacity for hybridisationto contribute to giant clam aquaculture production. The application of hybridisation to supply aquarium markets and necessary considerations for manipulating stock genetics are discussed in view of these results.

Details

Title: Larval and early juvenile culture of two giant clam (Tridacninae) hybrids
Authors: Thane A Militz (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Richard D Braley (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
David S Schoeman (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Paul C Southgate (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Publication details: Aquaculture, Vol.500, pp.500-505
Publisher: Elsevier BV
Date published: 2019
DOI: 10.1016/j.aquaculture.2018.10.050
ISSN: 0044-8486
Organisation Unit: School of Science and Engineering - Legacy; Australian Centre for Pacific Islands Research; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 99450735102621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Fisheries; Marine & Freshwater Biology

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