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Accueil du site → Master → Afrique du Sud → 2010 → The taxonomy, life-history and population dynamics of blacktail, Diplodus Capensis (Perciformes : Sparidae), in southern Angola

Rhodes University (2010)

The taxonomy, life-history and population dynamics of blacktail, Diplodus Capensis (Perciformes : Sparidae), in southern Angola

Richardson, Timothy John

Titre : The taxonomy, life-history and population dynamics of blacktail, Diplodus Capensis (Perciformes : Sparidae), in southern Angola.

Auteur : Richardson, Timothy John

Université de soutenance : Rhodes University

Grade : Masters thesis 2010

Résumé
The blacktail, Diplodus capensis, is an inshore sparid fish distributed from Mozambique to Angola. This species forms an important component of coastal fisheries within its distribution, one being the subsistence handline fishery in southern Angola. With this fishery being critically important to the livelihoods of local communities, a biological study and stock assessment was conducted to provide information for the management of this species in southern Angola. However, with molecular evidence suggesting that the Benguela current may have separated the southern African populations of many inshore fish species over two million years ago, a morphological, taxonomic analysis was considered necessary to first investigate whether there was evidence for allopatry in this species.A total of 46 morphometric measurements and 18 counts were carried out on specimens collected from various locations in southern Angola and South Africa. Results were analysed using multi-dimensional scaling (MDS) and the significance of clusters was tested using analysis of similarities (ANOSIM). Biological samples of D. capensis were collected monthly from an unexploited area from April 2008 to March 2009. Additional biological samples were collected from the subsistence fishers in an exploited area during May, June and December 2009. Standard biological laboratory techniques were employed for the lifehistory comparison between the exploited and unexploited area. A per-recruit analys

Mots clés : Diplodus, Angola, Perciformes, Sparidae, Fish populations, Classification of fishes, Fisheries

Présentation

Page publiée le 24 novembre 2011, mise à jour le 1er avril 2020