NMFS NUMBER: 93-NWR-023
of the Red Macroalga, Palmaria mollis, in Improving
Hatchery Seed Production of the Red Sea Abalone, Haliotis
Langdon, Christopher and Buchal, Michael; Hatfield Marine
Science Center, Oregon State University, Newport, OR 97365
National Marine Fisheries Service, Northwest Regional
Office, 7600 Sand Point Way, NE, Seattle, WA 98115.
PHONE: (206) 526-6115
was designed to examine the potential use of dulse (Palmaria
mollis) in the nursery production of red abalone
(Haliotis rufescens). Production of abalone seed
for farmers or enhancement programs is generally dependent
on settlement of larvae and culture of early juveniles
using diatom films on the surfaces of culture containers.
The quality of these diatom films is difficult to maintain
under nursery conditions and high mortalities of post-metamorphic
juveniles is commonly reported by abalone culturists.
We found that conditioning broodstock on a diet of dulse
instead of kelp, Nereocystis leutkeana, resulted in the
production eggs of significantly higher protein and lipid
content and higher hatching success rates. Larvae from
parents conditioned on dulse metamorphosed at significantly
higher success rates than larvae from parents conditioned
on kelp. Furthermore, dulse could be successfully
used instead of diatom coatings for larval settlement
and growth of early juvenile abalone. Overall, we found
that he use of dulse in nursery production of red abalone
was an excellent alternative to the use of kelp and diatom
films for conditioning broodstock and rearing early juveniles.