Western Indian Ocean JOURNAL OF Marine Science Volume 17 | Issue 1 | Jan – Jun 2018 | ISSN: 0856-860X Chief Editor José Paula Western Indian Ocean JOURNAL OF Marine Science Chief Editor José Paula | Faculty of Sciences of University of Lisbon, Portugal Copy Editor Timothy Andrew Editorial Board Louis CELLIERS Blandina LUGENDO South Africa Tanzania Lena GIPPERTH Aviti MMOCHI Serge ANDREFOUËT Sweden Tanzania France Johan GROENEVELD Nyawira MUTHIGA Ranjeet BHAGOOLI South Africa Kenya Mauritius Issufo HALO Brent NEWMAN South Africa/Mozambique South Africa Salomão BANDEIRA Mozambique Christina HICKS Jan ROBINSON Australia/UK Seycheles Betsy Anne BEYMER-FARRIS Johnson KITHEKA Sérgio ROSENDO USA/Norway Kenya Portugal Jared BOSIRE Kassim KULINDWA Melita SAMOILYS Kenya Tanzania Kenya Atanásio BRITO Thierry LAVITRA Max TROELL Mozambique Madagascar Sweden Published biannually Aims and scope: The Western Indian Ocean Journal of Marine Science provides an avenue for the wide dissem- ination of high quality research generated in the Western Indian Ocean (WIO) region, in particular on the sustainable use of coastal and marine resources. This is central to the goal of supporting and promoting sustainable coastal development in the region, as well as contributing to the global base of marine science. The journal publishes original research articles dealing with all aspects of marine science and coastal manage- ment. Topics include, but are not limited to: theoretical studies, oceanography, marine biology and ecology, fisheries, recovery and restoration processes, legal and institutional frameworks, and interactions/relationships between humans and the coastal and marine environment. In addition, Western Indian Ocean Journal of Marine Science features state-of-the-art review articles and short communications. The journal will, from time to time, consist of special issues on major events or important thematic issues. Submitted articles are subjected to standard peer-review prior to publication. Manuscript submissions should be preferably made via the African Journals Online (AJOL) submission plat- form (http://www.ajol.info/index.php/wiojms/about/submissions). Any queries and further editorial corre- spondence should be sent by e-mail to the Chief Editor, [email protected]. Details concerning the preparation and submission of articles can be found in each issue and at http://www.wiomsa.org/wio-journal-of-marine- science/ and AJOL site. Disclaimer: Statements in the Journal reflect the views of the authors, and not necessarily those of WIOMSA, the editors or publisher. Copyright © 2018 —Western Indian Ocean Marine Science Association (WIOMSA) No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means without permission in writing from the copyright holder. ISSN 0856-860X Cover image: Maputo (© Jose Paula, 2010) Western Indian Ocean JOURNAL OF Marine Science Volume 17 | Issue 1 | Jan – Jun 2018 Table of Contents Metapenaeus dobsoni (Miers, 1878), an alien Penaeidae in Mozambican coastal waters: confirmation by mtDNA and morphology analyses Luisa Simbine, Carla G. Marques, Patrícia D. Freitas, Kélvin E. Samucidine, Jaquenline Gusmão, Carolina Tavares, Pedro G. Junior 1 Keys and bibliography for the identification of zoeal stages of brachyuran crabs from the Western Indian Ocean Marta Bento, José Paula 13 Navigating the sea space: the nature and significance of giriama indigenous knowledge on marine resources Khamati Shilabukha 53 Reef fishes of praia do Tofo and praia da Barra, Inhambane, Mozambique Alexander J. Fordyce 71 A feeding aggregation of Omura‘s whale, Balaenoptera omurai, off Nosy Be, Mozambique Channel Pierre Laboute, Philippe Borsa 93 Hand-held Sediment Corer for Use in Shallow, Turbulent Coastal Environments Stephanie V. Stainbank, Michael H. Schleyer 99 Seasonal variation in the length-weight relationship and condition factor of thirty fish species from the Shimoni artisanal fishery, Kenya Mary B. Ontomwa, Gladys M. Okemwa, Edward N. Kimani, Clay Obota 103 Marine Biodiversity of La Reunion Island: Echinoderms Chantal Conand , Sonia Ribes-Beaudemoulin , Florence Trentin , Thierry Mulochau , Emilie Boissin 111 Length-weight relationship of selected teleost fishes from Kilifi County, Kenya Obuya J. Akinyi , Dorcus. A.O. Sigana , Virginia Wang’ondu, Nina Wambiji , Harrisson Ong’anda , Boaz Orembo 125 Instructions for Authors WIO Journal of Marine Science 17 (1 ) 2018 1-12 Original Article 1 Metapenaeus dobsoni (Miers, 1878), an alien Penaeidae in Mozambican coastal waters: confirmation by mtDNA and morphology analyses Luisa Simbine 1,2*, Carla G. Marques 1, Patrícia D. Freitas 1, Kélvin E. Samucidine 2, Jaquenline Gusmão 3, Carolina Tavares 3, Pedro G. Junior 1 1 Universidade Federal de São Carlos, 2 Instituto Nacional de Investigação 3 Universidade Estadual do Rio de Departamento de Genética e Evolução, Pesqueira, Av. Mao Tse Tung Nº 389, Janeiro (UERJ), Rua São Francisco Centro de Ciências Biológicas e da Maputo, Xavier, 524, Maracanã, Saúde, Via Washington Luís, Km. 235, Moçambique CEP: 20.550 – 900, Rio de Janeiro, Caixa Postal 676, CEP 13565-905, Brasil São Carlos, SP, Brasil * Corresponding author: [email protected] Abstract An alien shrimp species has been increasingly recorded in Maputo Bay, Mozambique, and its occurrence has been associated with a drastic reduction of a native and economically important Indian white shrimp, Fenneropenaeus indicus. Cytochrome c oxidase subunit I sequencing and body morphology analyses were used to identify this alien species. All results revealed its taxonomic identity as Metapenaeus dobsoni (Kadal shrimp), a native species from the eastern Indian Ocean, originally not recorded on the Mozambique coast. Maputo Bay is considered an important biodiversity hotspot and there are concerns regarding the presence of this alien species, which could weaken the bio- diversity of the Bay. Moreover, the increased contribution of this small-size shrimp within the fishery is of concern because of its potential negative impacts on fisheries and economic stability in the region. Keywords: Alien species; Molecular identification; COI; Biodiversity; Metapenaeus dobsoni Introduction natives (Dick & Platvoet, 2000). According to Shine Invasive species are generally associated with a num- et al. (2000), alien species are those occurring outside ber of negative impacts to native biodiversity. These their “natural distribution”, because they cannot reach impacts may affect the natural environment, the local this location by their own means, and some kind of economy and even human health (Leão et al., 2011). human action is involved in the introduction to the Invasive species may start competing or become pred- new location. If an alien species becomes established ators of native species (Hill & Lodge, 1999; Leão et al., in a new habitat, and is able to reproduce and generate 2011; Scannella et al., 2017), or even vectors of para- fertile descendants with a high probability of survival, sites and other pathogens (Torchin & Mitchell, 2004; it is then regarded as an alien invasive species (Shine Leão et al., 2011). Shrimps and other crustaceans can et al., 2000; Ciruna et al., 2004). host viral pathogens that are dangerous for other spe- cies inhabiting the same environment. A well-known The family Penaeidae contains several important com- example of dangerous viral diseases that affect shrimps mercial species that inhabit shallow coastal waters of is the White Spot Syndrome Virus (WSSV) (Hoa et al., tropical and subtropical regions (Dall et al., 1992; Chan, 2011; Bateman et al., 2012). In addition, exotic spe- 1998). Nine genera belonging to this family have been cies may hybridize with native species (Firmart et al., identified along the southeast coast of Africa, from the 2013) and reduce local biodiversity by eliminating the Rovuma River in northern Mozambique to the Kei 2 WIO Journal of Marine Science 17 (1 ) 2018 1-12 | L. Simbine et al. River in South Africa. Most of these shrimps inhabit In this paper, mitochondrial DNA (mtDNA) and body the continental shelf, between 5 and 70 m deep. morphology analyses were used to identify the species as Metapenaeus dobsoni, a native species from eastern In Mozambique, shrimp fishery is historycally Indian Ocean, and confirm that it is an alien species known as one of the pillars of economic growth, currently present in Maputo Bay, Mozambique. Sim- where Penaeus monodon (Giant tiger prawn), Melicer- bine (2016) reported the presence of this species on tus latisulcatus (Western king prawn), Metapenaeus the Mozambique coast for the first time. The pres- monoceros (Speckled shrimp), Metapenaeus stebbingi ent study confirms the occurrence of this species and (Peregrine shrimp), Marsupenaeus japonicus (Kuruma might provide information that will be useful in its prawn), Fenneropenaeus indicus (Indian white prawn), management, and protection and conservation of and Penaeus semisulcatus (Green tiger prawn) are the native species. most frequently captured species. Among these, F. indicus and M. monoceros are the most abundant Materials and methods species supporting commercial fisheries. Since 2007 Shrimp specimens were sampled from July 2010 to a new shrimp species has been recorded in Maputo June 2011 in Maputo Bay, Mozambique (Fig. 1a, 1b). Bay. This species had never been recorded in this A total of 26 individuals were collected: 5 M. monoceros, area, or along the Mozambican coastal waters. This 4 M. stebbingi, 5