Publications

Here you will find publications from DTU Aqua:

Recent publications

2018
 

Effect of bait type and size on catch efficiency of narrow-barred Spanish mackerel (Scomberomorus commerson) in the Persian Gulf handline fisheries

Year: 2018

Effect of bait type and size on catch efficiency of narrow-barred Spanish mackerel (Scomberomorus commerson) in the Persian Gulf handline fisheries

Eighani, M., Paighambari, S. Y., Herrmann, B. & Feekings, J. 1 Mar 2018 In : Fisheries Research. 199, p. 32-35

Publication: Research - peer-reviewJournal article – Annual report year: 2017

In the Persian Gulf handline fishery, fishers mostly use Cutlassfish (Trichiurus lepturus) bait for targeting narrow-barred Spanish mackerel (Scomberomorus commerson) However, Cutlassfish are expensive compared to other baits and also a commercially important species that is typically exported to Asian countries. In order to conserve Cutlassfish resources and reduce costs of fishing, the effect of changing bait type and size on the catch efficiency and size structure of narrow-barred Spanish mackerel caught in the Persian Gulf handline fishery was investigated. The alternative baits investigated, Indian mackerel (Rastrelliger kanagurta) and artificial bait (lead lure), resulted in a lower overall catch efficiency and a shift in catch pattern towards smaller individuals. The two alternative baits had very similar overall catch efficiencies. The results obtained demonstrate that bait type and size affects both overall catch efficiency and size structure of narrow-barred Spanish mackerel caught in the Persian Gulf handline fishery. This implies that managing bait type and size might complement standard harvest regulations and facilitate changing exploitation pattern in the Persian Gulf handline fishery.

Original languageEnglish
JournalFisheries Research
Volume199
Pages (from-to)32-35
ISSN0165-7836
DOIs
StatePublished - 1 Mar 2018

 

Assessing stakeholder's experience and sensitivity on key issues for the economic growth of organic aquaculture production

Year: 2018

Assessing stakeholder's experience and sensitivity on key issues for the economic growth of organic aquaculture production

Lembo, G., Jokumsen, A., Spedicato, M. T., Facchini, M. T. & Bitetto, I. 2018 In : Marine Policy. 87, p. 84-93

Publication: Research - peer-reviewJournal article – Annual report year: 2017

Participatory management is widely recognised as a working method of paramount importance, based on the principles of knowledge sharing, accountability and legitimacy. Hence, it is broadly considered suitable for
addressing issues related to the sustainable development of the seafood industry, and specifically, of the aquaculture system. A survey focused on the current EU regulatory framework was carried out to elicit stakeholders’
preferences, knowledge and experience on key issues for the development of organic aquaculture, supported by science-based regulations. The survey was completed by 65 stakeholders belonging to several categories, and it was supported by the implementation of the Analytic Hierarchy Process method. Stakeholders’ preferences were elicited on organic production methods and control systems, the quality of the environment and organic products, fish health and welfare. The views expressed by the participants revealed both competence and awareness, despite the complexity of the subject. Several ideas and useful suggestions emerged regarding unresolved technical issues. In addition, the need for a targeted communication strategy on the quality of organic aquaculture products and the necessity of fostering European/national programs to support the production and marketing of organic aquaculture products were highlighted
Original languageEnglish
JournalMarine Policy
Volume87
Pages (from-to)84-93
ISSN0308-597X
DOIs
StatePublished - 2018

2017
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Food availability drives plastic self-repair response in a basal metazoan-case study on the ctenophore Mnemiopsis leidyi A. Agassiz

Year: 2017

Food availability drives plastic self-repair response in a basal metazoan-case study on the ctenophore Mnemiopsis leidyi A. Agassiz

Bading, K. T., Kaehlert, S., Chi, X., Jaspers, C., Martindale, M. Q. & Javidpour, J. 1 Dec 2017 In : Scientific Reports. 7, 1, 16419

Publication: Research - peer-reviewJournal article – Annual report year: 2017

Many marine invertebrates including ctenophores are capable of extensive body regeneration when injured. However, as for the invasive ctenophore Mnemiopsis leidyi, there is a constant subportion of individuals not undergoing whole body regeneration but forming functionally stable half-animals instead. Yet, the driving factors of this phenomenon have not been addressed so far. This study sheds new light on how differences in food availability affect self-repair choice and regeneration success in cydippid larvae of M. leidyi. As expected, high food availability favored whole-body regeneration. However, under low food conditions half-animals became the preferential self-repair mode. Remarkably, both regenerating and half-animals showed very similar survival chances under respective food quantities. As a consequence of impaired food uptake after injury, degeneration of the digestive system would often occur indicating limited energy storage capacities. Taken together, this indicates that half-animals may represent an alternative energy-saving trajectory which implies self-repair plasticity as an adaptive trade-off between high regeneration costs and low energy storage capacities. We conclude that self-repair plasticity could lead to higher population fitness of ctenophores under adverse conditions such as in ships' ballast water tanks which is postulated to be the major vector source for the species' spreading around the globe.

Original languageEnglish
Article number16419
JournalScientific Reports
Volume7
Issue number1
ISSN2045-2322
DOIs
StatePublished - 1 Dec 2017

 

Hvordan undervandsdroner og robotter kan hjælpe med at monitere det arktiske marine miljø

Year: 2017

Hvordan undervandsdroner og robotter kan hjælpe med at monitere det arktiske marine miljø

Edelvang, K. 2017 In : Tidsskriftet Grønland. 3, p. 254-264

Publication: ResearchJournal article – Annual report year: 2017

Original languageDanish
JournalTidsskriftet Grønland
Issue number3
Pages (from-to)254-264
ISSN0017-4556
StatePublished - 2017

 

Sæler og fisk som naturlige måleplatforme

Year: 2017

Sæler og fisk som naturlige måleplatforme

Boje, J. 2017 In : Tidsskriftet Grønland. 3, p. 270-276

Publication: ResearchJournal article – Annual report year: 2017

Original languageDanish
JournalTidsskriftet Grønland
Issue number3
Pages (from-to)270-276
ISSN0017-4556
StatePublished - 2017

 

Periodic bacterial control with peracetic acid in a recirculating aquaculture system and its long-term beneficial effect on fish health

Year: 2017

Periodic bacterial control with peracetic acid in a recirculating aquaculture system and its long-term beneficial effect on fish health

Liu, D., Straus, D. L., Pedersen, L-F. & Meinelt, T. 2017 In : Aquaculture. 485, p. 154-159

Publication: Research - peer-reviewJournal article – Annual report year: 2017

Fish in a recirculating aquaculture system (RAS) live with abundant microorganisms. These can become a health threat when the fish immune system cannot counterbalance the pathogenic microbial colonization. Therefore, microbial control in a RAS can potentially reduce the risk of infections and hence improve fish health. In the present study, a periodic microbial control was performed in a RAS with 16 tanks stocked with mirror carp (Cyprinus carpio) for 3months. Half of the fish culture tanks were treated with 1mgL−1 peracetic acid (PAA) twice per week, while the other half remained untreated. The water circulation was interrupted immediately before each PAA-treatment, and resumed after 3h. The total aerobic bacterial density was similar in all culture tanks, except during the PAA-treatments and the concurrent circulation interruptions. During these periods, the bacterial density decreased up to 90% in PAA-treated water, while a 6-fold bacterial increase was observed in untreated water. In the first 2months of treatment, PAA-exposed fish showed lower plasma cortisol concentration than the unexposed fish. Subsequently, the trunk kidney leukocytes of PAA-exposed fish showed stronger respiratory burst than the unexposed fish. By the end of the experiment, the PAA-exposed fish had better gill morphology, compared to the unexposed fish. The present study indicates that periodic disinfection of culture water in a RAS with PAA could transiently reduce the suspended bacteria density, modulate the fish stress response, and have an overall beneficial effect on fish health in the long term.
Original languageEnglish
JournalAquaculture
Volume485
Pages (from-to)154-159
ISSN0044-8486
DOIs
StatePublished - 2017

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Acute and semi-chronic toxicity of vanadium tested on copepods of the species Temora longicornis

Year: 2017

Acute and semi-chronic toxicity of vanadium tested on copepods of the species Temora longicornis

Kristiansen, M. H., Iversen, N. H., Koski, M. & Trapp, S. 2017 Book of Abstracts Sustain 2017. Kgs. Lyngby, Denmark: Technical University of Denmark (DTU), 1 p. Sustain Abstract A-10

Publication: Research - peer-reviewConference abstract in proceedings – Annual report year: 2017


Original languageEnglish
Title of host publicationBook of Abstracts Sustain 2017
Number of pages1
Place of PublicationKgs. Lyngby, Denmark
PublisherTechnical University of Denmark (DTU)
Publication date2017
Article numberSustain Abstract A-10
StatePublished - 2017
EventSustain 2017 - Kgs. Lyngby, Denmark

Conference

ConferenceSustain 2017
LocationTechnical University of Denmark
CountryDenmark
CityKgs. Lyngby
Period06/12/201706/12/2017

 

Skræmmeliner giver renere jomfruhummerfangst

Year: 2017

Skræmmeliner giver renere jomfruhummerfangst

Melli, V., Frandsen, R., Krag, L. A. & Feekings, J. P. 2017 24, 47, Fiskeri Tidende

Publication: CommunicationNewspaper article – Annual report year: 2017

Original languageDanish
JournalFiskeri Tidende
Volume24
Issue number47
Pages (from-to)9-10
ISSN0909-7325
StatePublished - 2017

 

Newton step methods for AD of an objective defined using implicit functions

Year: 2017

Newton step methods for AD of an objective defined using implicit functions

Bell, B. M. & Kristensen, K. 2017 In : Optimization Methods and Software. p. 1-17

Publication: Research - peer-reviewJournal article – Annual report year: 2017

Original languageEnglish
JournalOptimization Methods and Software
Pages (from-to)1-17
ISSN1055-6788
DOIs
StatePublished - 2017


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