Population genetics structure of juvenile Mugil cephalus around Zanzibar and Bagamoyo (Tanzania) reveals multiple genetic demes
(English)Manuscript (Other academic)
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 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 Mugil cephalus collected from six sites around Bagamoyo (Tanzanian mainland) and Zanzibar Island, East Africa. Fish were caught in low tide using a seine net. All fish collected were juveniles with a total length ranging between 7 and 14 cm (mean length of about 10 cm). Samples were analyzed using Amplified Fragment Length Polymorphism (AFLP), and the Bayesian assignment test implemented in the STRUCTURE 2.2 software was applied to detect if sites were composed of several genetic demes. Our results indicate that all sites contain several different genetic demes suggesting that juvenile collection from a single site may neither harm the genetic diversity of wild M. cephalus nor reduce its disease resistance within an aquaculture system. By collecting juvenile fish from a single site one will in effect harvest juveniles from several genetic lineages.
Mugil cephalus, Population genetic structure, deme, Western Indian Ocean, aquaculture
Fish and Aquacultural Science
Research subject Animal Ecology
IdentifiersURN: urn:nbn:se:su:diva-27397OAI: oai:DiVA.org:su-27397DiVA: diva2:214033
ProjectsSida-SAREC Marine Bilateral Programme between Sweden and Tanzania