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816204 Introduction to Marine Technology Role of microalgae in aquaculture Asist. Prof. Dr. Chalee Paibulkichakul

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816204 Introduction to Marine Technology

Role of microalgae in aquaculture

Asist. Prof. Dr. Chalee Paibulkichakul

Aquaculture production of Thailand

Aquaculture value of Thailand

Emphasis of microalgae

Pros Source of natural products Supply larvae feed

Cons Eutrophication Harmful algae

Natural products

Isochrysis galbana Phaeodactylum tricornutum Porphyridium cruentum Produce polyunsaturated fatty acid in

semicontinuous culture

Natural products

Marine dinoflagellates are a rich source of compounds with intriguing structures and interesting biological activities.

Dinoflagellates Amphidinium sp. : isolated a series of cytotoxic macrolides Amphidonolides B, C, G, H and N

* Amphidonolides activity: - antitumor

Natural products

Gambieric acid A has been isolated from marine dinoflagellate Gambierdiscus toxicus.

properties: antifungal agent

Natural products

Dunaliella – beta carotene

Natural products

Haematococcus pluvialis - astaxanthin

Natural products

Natural products

Spirulina – gamma linoleic acid (C18)

Nutrition of microalgae

Nutrition of microalgae

Nutrition of microalgae

Nutrition of microalgae

Nutrition of microalgae

Microalgae for aquaculture

Food source for aquatic animal larvae Food source for abalone and bivalve Nutritional enrichment

Microalgae for aquaculture

Microalgae for aquaculture

Microalgae for aquaculture

Microalgae for aquaculture

Microalgae for aquaculture

Microalgae for aquaculture

Microalgae for aquaculture

Microalgae for aquaculture

Microalgae for aquaculture

Microalgae for aquaculture

Constraints on algae production Not grow in highly selective environment The climate often not optimal for growth Requires expertise Growth mainly in batch culture Culture systems not inefficient Cost production strongly affected by economics of

scale

Microalgae for aquaculture

Opportunities Computer control/automation Streamlining of scale-up Reduction of the number of culture units Continuous culture Use of pre-mixed nutrients