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Pomacanthus Imperator (Bloch, 1787) Along the Kenyan Coast

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Pomacanthus Imperator (Bloch, 1787) Along the Kenyan Coast Western Indian Ocean JOURNAL OF Marine Science Volume 15 | Issue 2 | Jul – Dec 2016 | 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 © 2016 —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: A seagrass meadow (Thalassia hemprichii) at Inhaca Island, Mozambique (© José Paula, 2017) WIO Journal of Marine Science 15 (2 ) 2016 19-30 Original Article 19 Reproductive biology and body condition of exploited populations of Emperor Angelfish, Pomacanthus imperator (Bloch, 1787) along the Kenyan Coast Clay O. Obota 1, 2*, Bernerd M. Fulanda 1, Gladys M. Okemwa 2, Edward N. Kimani 2 1 Department of Biological 2 Kenya Marine and Fisheries * Corresponding author: Sciences, Pwani University, Research Institute, P.O. Box [email protected], P.O. Box 195-80108, Kilifi, 81561-80100, Mombasa, [email protected] Kenya Kenya Abstract A substantial proportion (in terms of value and quantity) of the Pomacanthus imperator catch on the Kenyan coast are traded, and the species is also harvested as food in the artisanal fishery. However information on their repro- ductive biology is scanty. The overall sex ratio differed significantly from 1:1 according to chi-square testp< ( 0.05). Sizes at maturity (L50) were estimated to be 25cm and 28cm TL for females and males respectively. Fecundity was estimated to be in the range of 17,790-266,472 with a Mean ±SE of 79,353±11,747, and was linearly related to total length and ovary weight. March-April was the main period of reproductive activity based on gonad somatic indices and monthly proportion of mature individuals. The LWR indicated isometric growth both in males and females of P. imperator, as the allometric coefficient b values were not significantly different from the expected isometric value of 3 (Student’s t-test; p=0.12). Relative condition factor did not vary significantly between the months sampled. The reproductive parameters obtained from this study provide some baseline information for management of this spe- cies which has proven to be highly vulnerable to depletion due to overfishing. Keywords: Emperor Angelfish, Pomacanthus imperator, reproduction, body condition, Kenya. Introduction the Red sea and East Africa, to the Hawaiian, Line and Angelfishes of the genus Pomacanthus are among Tuamoto Islands. A second main area of abundance the most highly prized aquarium reef fishes traded has also been recognized from Southern Japan south worldwide, and are a favorite for divers and aquarists to the Great Barrier reef, the Austral Islands and New alike (Thresher, 1982; Nelson, 2006). The emperor Caledonia (Froese and Pauly, 2006). angelfish, P. imperator Bloch, 1787, is among the most spectacularly colored and broadly recognized spe- The exploitation patterns in the aquarium fisheries cies of coral reef-associated fishes. Globally, the fam- in Kenya focus on specific fishing grounds and par- ily comprises about 25% in volume of the estimated ticular species (Okemwa et al., 2016); which can lead 1472 aquarium species traded annually (Sadovy, 1992; to localized depletion, especially for high value spe- Wabnitz et. al., 2003). The genera Pomacanthus belong cies such as P. imperator. Little is known about the to the group of larger angelfishes (Hiroshi, 1994). reproduction of many of the populations of larger angelfish species including P. imperator, with the few In Kenya, the genus forms a substantial proportion studies that have been conducted focusing mainly of the aquarium fish trade in terms of value and on systematics, courtship and spawning, with some abundance (Okemwa et al., 2016). A large abundance attention on reproduction in other Pomacanthid of Pomacanthus angelfishes has been reported in the species (Konow et al., 2006; Aburto-Oropeza et al., western Indo-Pacific (Fricke, 1999; Pyle, 2001) from 2000; Thresher, 1982). 21 20 21 WIO Journal of Marine Science 15 (2 ) 2016 19-30 | C. Obota et al. Figure 1. A map of Kenya (inset) showing the location of study sites of Shimoni, Kanamai, Kuruwitu and Kilifi. Figure 1. Trade in marine angelfishes is almost entirely com- specific sizes may affect reproductive capacity and pop- prised of wild-caught specimens (Collier et al., 2003). ulation structure and thus reduce resilience to growth P. imperator is highly sort after and among the most val- and recruitment overfishing ( Jennings et al., 2001). ued (Okemwa et al., 2009). Chung and Woo (1999) affirm P. imperator was ranked as moderately vulnerable to that commercial exploitation of P. imperator has only over-exploitation by the aquarium fishery in a risk focused on the aquarium trade and therefore individu- assessment study using productivity and susceptibility als longer than 25cm (SL) are rarely exploited. P. imper- analysis (PSA) (Okemwa et al., 2016). The species has the ator is among the species that has been reported to have potential for localized depletion under the cumulative declined due to the aquarium trade globally (Schwerdt- pressures of both the aquarium and small-scale food ner and Dandava, 2014), and in Kenya (Okemwa et al., fish fisheries. Due to the lack of adequate information on 2006). A significant catch is taken along the Kenya coast stocks of P. imperator, the design of sound management by artisanal fishers even though the species is predomi- interventions and harvest strategies has been difficult. nantly targeted for the aquarium trade, and may there- This study presents the first investigation into the repro- fore be under heavy fishing pressure. Artisanal fishers ductive biology and body condition of P. imperator pop- targeting this species mostly use spear guns and hand ulations along the Kenyan coast, as a first step towards lines (Obota, pers. obs., 2014). Selective harvesting of evaluating their stock status. The aim of this study was to C. Obota et al. | WIO Journal of Marine Science 15 (2 ) 2016 19-30 21 provide baseline biological information as a contribu- Kanamai landing sites in Kilifi County, and at Shi- tion towards enhancing the management of key target moni village in Kwale County (Fig. 1). The sites were species exploited by the aquarium fishery in Kenya. purposely selected because they are among the most important fishing grounds for aquarium fish species Materials and Methods in terms of volume (Okemwa et al., 2016). Sampling sites The sampling sites for this study were located in Shi- Fish Sample collection and specimen processing moni on the south coast of Kenya (04° 38.9´ S; 39° 22.9´ Due to variability in the artisanal catch, samples were E), and Kilifi on the north coast (3° 38.3´ S; 39° 50.77´ only collected for the months of March through July E). Specimens were collected at Kilifi, Kuruwitu and 2014, and January through June 2015. Total length (TL) Table 1. Criteria used for determination of maturity stages of P. imperator (adapted from Murphy and Taylor [1999], West [1990], and Yamaguchi et. al. [2006]). (a) Ovarian maturity stage Macroscopic features Immature Ovary small, strand-like and transparent; Most advanced oocytes (eggs) are at peri-nucleus stage or yolk vesicle stage. The gonads present reduced dimension (6mm in length and 1.8cm width). Ovaries Maturing in color from pink to pale yellow. Most oocytes are in early vitellogenesis stage. Oocytes in late vitellogenesis stage can also be seen. Besides, brown bodies can also be observed. Ovaries are yellow in color. An increase in blood vessels, volume and size structure Ripening are recorded. Most oocytes are in the late vitellogenesis stage.
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