Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
AFLP assisted DNA-Barcoding of mullets (Mugilidae) used in East African aquaculture
Stockholm University, Faculty of Science, Department of Zoology, Animal Ecology. Södertörns högskola.ORCID iD: 0000-0002-1893-6320
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
Show others and affiliations
2012 (English)In: Western Indian Ocean Journal of Marine Science, ISSN 0856-860X, E-ISSN 2683-6416, Vol. 11, no 1, p. 41-54Article in journal (Refereed) Published
Abstract [en]

There is a growing demand for wild caught juvenile fish to supply the market for aquaculture. However, little is known about the genetic effects of juvenile collection from wild populations. There are a number of imminent threats to both aquaculture systems and wild fish populations. Juvenile collection from a single population can for example reduce population’s evolutionary potential as well as the disease resistance within an aquaculture pond. In this study, we investigated the local genetic structure of juvenile mullets collected from five sites around Bagamoyo (Tanzanian mainland) and Zanzibar Island, East Africa. Fish were caught in low tide using a seine net. The fish were morphologically identified, and then genetically identified using direct sequencing of the CO1 gene with cross referencing with the Barcode of Life Database (BOLD) systems.  Molecular variance analyses were used to infer genetic subdivision based on geographic sampling site as well as inferring population structure through the Bayesian assignment test implemented in STRUCTURE 2.3. Our results showed that samples morphologically identified as Mugil cephalus where in fact Valamugil buchanani and we also found evidence of an introgression genome event, where the gene flow from one species may have affected the general gene pool. The Bayesian analysis revealed a clear genetic population structure among the sampled fish; the main difference was the presence of a unique mainland cluster. Our findings may have important implications for management and conservation of mullet fishes in the region and elsewhere.

Place, publisher, year, edition, pages
2012. Vol. 11, no 1, p. 41-54
Keywords [en]
AFLP, aquaculture, CO1, mtDNA, Mullet, population genetic structure, Western Indian Ocean
National Category
Evolutionary Biology
Research subject
Animal Ecology
Identifiers
URN: urn:nbn:se:su:diva-92569OAI: oai:DiVA.org:su-92569DiVA, id: diva2:640113
Funder
Sida - Swedish International Development Cooperation AgencyAvailable from: 2013-08-12 Created: 2013-08-11 Last updated: 2022-12-09Bibliographically approved
In thesis
1. Genetic connectivity of fish in the Western Indian Ocean
Open this publication in new window or tab >>Genetic connectivity of fish in the Western Indian Ocean
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

An almost unbroken fringing reef runs along the east coast of Africa, the lagoon inside the reef is the foundation of almost all artisanal fisheries. It is a low-tech fishery conducted by many people. Some areas can have up to 19 fishermen per square kilometer. High fishing pressures, coupled with declining fish stocks has led to changes in mean size and reproductive age of many exploited species. There is a vital and urgent need for scientifically based management systems, including the utilization of genetic information to guide management practices.

This thesis aims to investigate the presence of genetic structures in the western Indian Ocean. In order to do that we first investigated the historical patterns of connectivity throughout the region (paper I). In papers II and III we focused on local scale connectivity in Kenya and Tanzania and finally in paper IV we investigate the large-scale contemporary gene flow throughout the Western Indian Ocean. In paper III we also investigate the temporal genetic variation at one site and compare it to the small-scale genetic variation along a stretch of the Kenyan coastline. Some overall conclusions that can be drawn from my body of work are: there are genetic structures present in the western Indian Ocean even though the apparent lack of physical barriers. Major oceanic currents aid evolutionary dispersal patterns. A single geographic site need not be genetically homogenous or temporally stable. Island sites are genetically more homogenous than mainland sites.

In conclusion, there are clear and distinct genetic structures present especially in Siganus sutor, the most targeted fish for the artisanal fishery in East Africa.

Place, publisher, year, edition, pages
Stockholm: Department of Zoology, Stockholm University, 2013. p. 43
Series
Södertörn doctoral dissertations, ISSN 1652-7399 ; 84
Keywords
population genetics, indian ocean, siganus sutor, valamugil buchanani, scarus ghobban, connectivity, aflp, mtDNA, d-loop, CO1
National Category
Zoology
Research subject
Animal Ecology
Identifiers
urn:nbn:se:su:diva-92598 (URN)978-91-7447-729-0 (ISBN)978-91-86069-74-2 (ISBN)
Public defence
2013-09-27, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 12, Stockholm, 13:00 (English)
Opponent
Supervisors
Funder
Sida - Swedish International Development Cooperation Agency
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Manuscript. Paper 4: Manuscript.

Available from: 2013-09-05 Created: 2013-08-12 Last updated: 2022-02-24Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Fri fulltext

Authority records

Henriksson, OskarGullström, Martin

Search in DiVA

By author/editor
Henriksson, OskarGullström, Martin
By organisation
Animal EcologyDepartment of Ecology, Environment and Plant Sciences
In the same journal
Western Indian Ocean Journal of Marine Science
Evolutionary Biology

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 192 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf