Blue diatoms as a potential for sustainable shellfish aquaculture

Fiddy S. Prasetiya1,2,3, Jean-Luc Mouget 1, Priscilla Decottignies4, Michèle Morançais4, Luc A. Comeau6, François Turcotte5, Romain Gastineau1, Iskandar2, Toto Subroto3, Christophe Stavrakakis7, Réjean Tremblay5, and Bruno Cognie4

 

1 FR CNRS 3473 IUML, Mer-Molécules-Santé (MMS), Le Man Université, Avenue O. Messiaen, 72085 Le Mans cedex 9, France;

2 Marine Sciences Department, Faculty of Fisheries and Marine Sciences, Universitas Padjadjaran, Jl. Raya Bandung Sumedang KM 21, Jatinangor 40600, Indonesia;

3 Research Centre of Biotechnology and Bioinformatics, Universitas Padjadjaran, Jl. Raya Bandung Sumedang KM 21, Jatinangor 40600, Indonesia;

4 FR CNRS 3473 IUML, Mer-Molécules-Santé (MMS), Université de Nantes, 2 rue de la Houssinière 44322 Nantes cedex 3, France;

5 Institut des sciences de la mer de Rimouski, Université du Québec à Rimouski, 310 des Ursulines, Rimouski, Québec, Canada, G5L 3A1;

6 Fisheries and Oceans Canada, Gulf Fisheries Centre, Science Branch, 343 Université Av., Moncton, New Brunswick E1C 9B6, Canada;

7 IFREMER, Laboratoire Sécurisation des Productions en Conchyliculture (LSPC), Polder du Daim, 85230 Bouin, France 

 

Keywords: blue diatom, bivalve, Haslea ostrearia, marennine, sustainable shellfish aquaculture

 

Abstract

Microalgae have been considered as a promising alternative not only to substitute animal-derived proteins but also because they have prophylactic and antibacterial properties that may contribute to sustainable aquaculture. Among microalgae species, the blue diatom that refers to Haslea ostrearia, is a marine diatom known for its particularity in producing a water-soluble blue pigment, marennine, responsible for the greening of oyster gills. In the French’ Atlantic Coast, this phenomenon has a significant economic impact in oyster aquaculture. Moreover, recent studies revealed that pigments produced by other species of the genus Haslea (marennine-like pigment) have comparable characteristics and biological activities, such as prophylactic and antimicrobial agent against shellfish pathogens that are responsible for mass mortality events. The present work is part of the H2020 GHaNA program, which aims to highlight the assessment on potential utilization of this diatom to support sustainability of molluscan shellfish industry. The interaction of Haslea and its pigment with commercially important bivalve species is also discussed. We found that marennine can alter the functional responses of the bivalve at certain concentrations. It also appeared that the effect of this pigment was species and age dependent. Therefore, further studies are required to enhance our understanding between the upside and downside effects of marennine as prophylactic agent to reinforce sustainable shellfish aquaculture.