Graduate Thesis Or Dissertation
 

Development and Evaluation of a Static Land-Based Aquaculture System for Pacific Dulse (Devaleraea mollis): Environmental and Nutrient Requirements

Público Deposited

Conteúdo disponível para baixar

Baixar PDF
https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/2n49t951h

Descriptions

Attribute NameValues
Creator
Abstract
  • Devaleraea mollis (Pacific Dulse) is becoming a popular food for human consumption. Previously, Pacific Dulse has been used as a nutrient source for cultured abalone species, with some historical food use by indigenous peoples, while the closely related Atlantic dulse (Palmaria palmata) has a long-documented history of use in cuisine and as animal fodder. Its popularity as a cooking ingredient has expanded with the observation, made by researchers at Oregon State University, that Pacific dulse resembles bacon in flavor when deep fried. Increasing consumption of Pacific dulse as a human food necessitates more research on sustainably producing this sea vegetable in greater quantities. The hurdles facing expanded dulse production are mainly in the form of production costs and the necessity of being dependent on a coastal location for a continuous supply of seawater to support flow-through seawater culture systems. Major costs in flow-through dulse aquaculture are related to pumping seawater, and inefficient use of added nutrients. By developing a static culture system that is not dependent on the continuous supply of seawater, dulse aquaculture could expand into non-coastal areas with less expensive land costs. The development of methods for the static dulse culture was the objective of this research thesis. In this study, we found that dulse grown in static cultures with salinities ranging from 21 to 33 showed no significant differences in growth rates and were not significantly different from that of dulse grown in standard flow-through conditions. Dulse grown in seawater with salinities ranging from 15 to 18 had growth rates that were significantly lower than that of dulse grown at salinities of 21 to 33. Dulse cultured in synthetic ocean water showed no significant difference in growth rate compared with that of dulse grown in natural seawater. Growth rates of dulse subjected to water change rates of one, two, three, and six weeks, with weekly additions of nutrients, showed no significant difference among treatments. Dulse grown using Guillard’s f/2 media with the vitamin component omitted (Guillard’s f/2-vitamins), showed no significant difference in growth rate compared with dulse grown using unmodified f/2. Dulse grown using macronutrients alone had significantly less growth than unmodified f/2 and f/2 with vitamins omitted. In one experiment, growth rates for dulse cultured with macronutrients together with either EDTA alone or FeDTPA were not significantly different from those of dulse grown in Guillard’s f/2 without vitamins; however, in a subsequent experiment, f/2 without vitamins supported significantly higher growth rates than macronutrients alone and macronutrients with EDTA alone. In a sensory evaluation of five types of raw dulse grown in both static and flow-through systems, and with different fertilization treatments, only “Aroma,” was significantly different in one treatment (sample 2, static fertilized system with natural seawater). Low purchase cost was reported to be a high priority for members of the consumer panel.
License
Resource Type
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Committee Member
Academic Affiliation
Non-Academic Affiliation
Declaração de direitos
Funding Statement (additional comments about funding)
  • This endeavor would not have been possible without the generous support from the Oregon State University Fisheries, Wildlife, and Conservation Sciences Department, Mamie Markham Research Award, Oregon Department of Agriculture ODA-3693-GR (2015-2018), and Hatfield Marine Science Center, who helped finance my research.
Publisher
Peer Reviewed
Language

Relações

Parents:

This work has no parents.

Em Collection:

Itens

Miniatura Título Data de carga Acesso Ações
file details ChatfieldMarcusW2023.pdf 2023-12-14 Público Baixar