Palmaria palmata (Dulse) cultivation in Denmark – new strategies for hatchery optimization

Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review

Abstract

Interest in Palmaria palmata for human consumption has increased in Europe lately, indicated by high market prices reaching 245 € per dry kg. As demands go up, focus on cultivation rather than wild harvest is important to avoid diminishment of wild populations and to secure a sustainable production. However, low spore-to-seedling efficiency, imposing a high requirement of sori for seeding in large-scale cultivation, points to a need for developing current hatchery techniques. In a step-wise approach focusing on spore release, spore seeding, and seedling development, we have developed new protocols to optimize cultivation practice for P. palmata. In a line of setups, we have investigated the effect of parameters, such as substrate type and water agitation, on the spore release rate, the spore settlement and the seedling development. Also, in a new approach using released spore aggregates as inoculum, we have tested the ability of these to re-attach using high agitation seeding as an alternative to the normally used gravity-based seeding method. Finally, a first attempts to seed on nets in a high-agitated flow-through system has been carried out. The level of water agitation had a strong positive effect on the settlement and dispersal of spores and seedlings in general, with a further implication for the ability of macerated spore aggregates to re-attach. Aggregates germinating into a mixture of spores and sporelings during 30 days showed an ability of discoid re-attachment and growth after maceration pretreatment, and applying high water agitation resulted in 39% survival of seedlings which is to be considered high for this species. Based on this study, we suggest new versatile strategies for P. palmata cultivation including the use of germinated spore aggregates showing the ability of discoid re-attachment on twine, and high-agitated seeding systems for improved spore use and spore dispersal on cultivation lines

Original languageEnglish
Publication date2019
Publication statusPublished - 2019
Event23rd International Seaweed Symposium - Jesu, Korea, Democratic People's Republic of
Duration: 28 Apr 20193 May 2019

Conference

Conference23rd International Seaweed Symposium
CountryKorea, Democratic People's Republic of
CityJesu
Period28/04/201903/05/2019

Cite this

Nielsen, M. M., & Schmedes, P. S. (2019). Palmaria palmata (Dulse) cultivation in Denmark – new strategies for hatchery optimization. Abstract from 23rd International Seaweed Symposium , Jesu, Korea, Democratic People's Republic of.
Nielsen, Mette Møller ; Schmedes, Peter Søndergaard. / Palmaria palmata (Dulse) cultivation in Denmark – new strategies for hatchery optimization. Abstract from 23rd International Seaweed Symposium , Jesu, Korea, Democratic People's Republic of.
@conference{0dc70410742e401da527555c63f731a4,
title = "Palmaria palmata (Dulse) cultivation in Denmark – new strategies for hatchery optimization",
abstract = "Interest in Palmaria palmata for human consumption has increased in Europe lately, indicated by high market prices reaching 245 € per dry kg. As demands go up, focus on cultivation rather than wild harvest is important to avoid diminishment of wild populations and to secure a sustainable production. However, low spore-to-seedling efficiency, imposing a high requirement of sori for seeding in large-scale cultivation, points to a need for developing current hatchery techniques. In a step-wise approach focusing on spore release, spore seeding, and seedling development, we have developed new protocols to optimize cultivation practice for P. palmata. In a line of setups, we have investigated the effect of parameters, such as substrate type and water agitation, on the spore release rate, the spore settlement and the seedling development. Also, in a new approach using released spore aggregates as inoculum, we have tested the ability of these to re-attach using high agitation seeding as an alternative to the normally used gravity-based seeding method. Finally, a first attempts to seed on nets in a high-agitated flow-through system has been carried out. The level of water agitation had a strong positive effect on the settlement and dispersal of spores and seedlings in general, with a further implication for the ability of macerated spore aggregates to re-attach. Aggregates germinating into a mixture of spores and sporelings during 30 days showed an ability of discoid re-attachment and growth after maceration pretreatment, and applying high water agitation resulted in 39{\%} survival of seedlings which is to be considered high for this species. Based on this study, we suggest new versatile strategies for P. palmata cultivation including the use of germinated spore aggregates showing the ability of discoid re-attachment on twine, and high-agitated seeding systems for improved spore use and spore dispersal on cultivation lines",
author = "Nielsen, {Mette M{\o}ller} and Schmedes, {Peter S{\o}ndergaard}",
year = "2019",
language = "English",
note = "23rd International Seaweed Symposium ; Conference date: 28-04-2019 Through 03-05-2019",

}

Nielsen, MM & Schmedes, PS 2019, 'Palmaria palmata (Dulse) cultivation in Denmark – new strategies for hatchery optimization' 23rd International Seaweed Symposium , Jesu, Korea, Democratic People's Republic of, 28/04/2019 - 03/05/2019, .

Palmaria palmata (Dulse) cultivation in Denmark – new strategies for hatchery optimization. / Nielsen, Mette Møller; Schmedes, Peter Søndergaard.

2019. Abstract from 23rd International Seaweed Symposium , Jesu, Korea, Democratic People's Republic of.

Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review

TY - ABST

T1 - Palmaria palmata (Dulse) cultivation in Denmark – new strategies for hatchery optimization

AU - Nielsen, Mette Møller

AU - Schmedes, Peter Søndergaard

PY - 2019

Y1 - 2019

N2 - Interest in Palmaria palmata for human consumption has increased in Europe lately, indicated by high market prices reaching 245 € per dry kg. As demands go up, focus on cultivation rather than wild harvest is important to avoid diminishment of wild populations and to secure a sustainable production. However, low spore-to-seedling efficiency, imposing a high requirement of sori for seeding in large-scale cultivation, points to a need for developing current hatchery techniques. In a step-wise approach focusing on spore release, spore seeding, and seedling development, we have developed new protocols to optimize cultivation practice for P. palmata. In a line of setups, we have investigated the effect of parameters, such as substrate type and water agitation, on the spore release rate, the spore settlement and the seedling development. Also, in a new approach using released spore aggregates as inoculum, we have tested the ability of these to re-attach using high agitation seeding as an alternative to the normally used gravity-based seeding method. Finally, a first attempts to seed on nets in a high-agitated flow-through system has been carried out. The level of water agitation had a strong positive effect on the settlement and dispersal of spores and seedlings in general, with a further implication for the ability of macerated spore aggregates to re-attach. Aggregates germinating into a mixture of spores and sporelings during 30 days showed an ability of discoid re-attachment and growth after maceration pretreatment, and applying high water agitation resulted in 39% survival of seedlings which is to be considered high for this species. Based on this study, we suggest new versatile strategies for P. palmata cultivation including the use of germinated spore aggregates showing the ability of discoid re-attachment on twine, and high-agitated seeding systems for improved spore use and spore dispersal on cultivation lines

AB - Interest in Palmaria palmata for human consumption has increased in Europe lately, indicated by high market prices reaching 245 € per dry kg. As demands go up, focus on cultivation rather than wild harvest is important to avoid diminishment of wild populations and to secure a sustainable production. However, low spore-to-seedling efficiency, imposing a high requirement of sori for seeding in large-scale cultivation, points to a need for developing current hatchery techniques. In a step-wise approach focusing on spore release, spore seeding, and seedling development, we have developed new protocols to optimize cultivation practice for P. palmata. In a line of setups, we have investigated the effect of parameters, such as substrate type and water agitation, on the spore release rate, the spore settlement and the seedling development. Also, in a new approach using released spore aggregates as inoculum, we have tested the ability of these to re-attach using high agitation seeding as an alternative to the normally used gravity-based seeding method. Finally, a first attempts to seed on nets in a high-agitated flow-through system has been carried out. The level of water agitation had a strong positive effect on the settlement and dispersal of spores and seedlings in general, with a further implication for the ability of macerated spore aggregates to re-attach. Aggregates germinating into a mixture of spores and sporelings during 30 days showed an ability of discoid re-attachment and growth after maceration pretreatment, and applying high water agitation resulted in 39% survival of seedlings which is to be considered high for this species. Based on this study, we suggest new versatile strategies for P. palmata cultivation including the use of germinated spore aggregates showing the ability of discoid re-attachment on twine, and high-agitated seeding systems for improved spore use and spore dispersal on cultivation lines

M3 - Conference abstract for conference

ER -

Nielsen MM, Schmedes PS. Palmaria palmata (Dulse) cultivation in Denmark – new strategies for hatchery optimization. 2019. Abstract from 23rd International Seaweed Symposium , Jesu, Korea, Democratic People's Republic of.