alexa Effect of Different Filter Methods on Seawater Quality
ISSN: 2155-9546

Journal of Aquaculture Research & Development
Open Access

Like us on:
OMICS International organises 3000+ Global Conferenceseries Events every year across USA, Europe & Asia with support from 1000 more scientific Societies and Publishes 700+ Open Access Journals which contains over 50000 eminent personalities, reputed scientists as editorial board members.

Open Access Journals gaining more Readers and Citations

700 Journals and 15,000,000 Readers Each Journal is getting 25,000+ Readers

This Readership is 10 times more when compared to other Subscription Journals (Source: Google Analytics)

Research Article

Effect of Different Filter Methods on Seawater Quality at a Marine Scallop Hatchery

Thorolf Magnesen1*, Anita Jacobsen2 and Malebo Hellen Moepi1
1Department of Biology, University of Bergen, PO Box 7803, N-5020 Bergen, Norway
2Institute of Marine Research, PO Box 1870 Nordnes, N-5817 Bergen, Norway
Corresponding Author : Thorolf Magnesen
Department of Biology
University of Bergen
P.O Box-7803, N-5020 Bergen, Norway
E-mail: [email protected]
Received October 01, 2012; Accepted December 18, 2012; Published December 28, 2012
Citation: Magnesen T, Jacobsen A, Moepi MH (2013) Effect of Different Filter Methods on Seawater Quality at a Marine Scallop Hatchery. J Aquac Res Development 4:168 doi:10.4172/2155-9546.1000168
Copyright: © 2013 Magnesen T, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Related article at
DownloadPubmed DownloadScholar Google


The effect of using two different filtering methods in the main seawater inlet to a scallop (Pecten maximus) hatchery in Norway was tested. Seawater was filtered through active filter media (AFM) and a protein skimmer, or through a drum filter and a protein skimmer. Seawater quality was characterized and tested on algal growth rate, egg development and larval activity. Tests were performed under winter and spring conditions (March, April and May 2009). Both seawater treatments reduced the dissolved organic carbon concentrations in the inlet seawater. The total bacterial number was stable in both seawater treatments, except for an increase in the drum filter in March. The bacterial community showed seasonal development: Actinobacteria and Alphaproteobacteria dominated in March, while Gammaproteobacteria dominated in April and May. In a cluster analysis, samples from both seawater treatments showed high similarity on similar sampling dates. Vibrio spp. occurred, but was never observed in seawater coming from the skimmer after the drum filter. This sampling point was often clustered as most similar to the incoming seawater. The fraction of scallop eggs that developed into veliger larvae increased from 10% to 50% during the sampling period, and no significant differences were found between the two seawater treatments. The fraction of 8 day old active larvae was lowest in March, in experiments with both undiluted and diluted (1:10, 1:100) seawater from both treatments. No significant difference in activity was found between the treatments, except for undiluted (April) and 100-fold dilution (April and May) from the drum filter, when the larval activity was significantly higher. The effect of both seawater treatments was tested by growing the diatom Chaetoceros muelleri in small volumes for 4-5 days. Daily growth rates (μ) varied between 0.75 and 1.15, and were highest in May. No significant difference in cell concentration was found between the treatments. The results showed that the skimmer attached to the drum filter had the best performance overall in reducing dissolved organic carbon and potentially lethal bacteria. These findings have important implications for hatchery seawater management protocols.

Share This Page

Additional Info

Loading Please wait..
Peer Reviewed Journals
Make the best use of Scientific Research and information from our 700 + peer reviewed, Open Access Journals
International Conferences 2017-18
Meet Inspiring Speakers and Experts at our 3000+ Global Annual Meetings

Contact Us

© 2008-2017 OMICS International - Open Access Publisher. Best viewed in Mozilla Firefox | Google Chrome | Above IE 7.0 version