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  • 1
    Electronic Resource
    Electronic Resource
    Status and exploitation of the mangrove and associated fishery resources in Zanzibar (1992)
    Springer
    Hydrobiologia 247 (1992), S. 229-234 
    Details
    ISSN: 1573-5117
    Keywords: exploitation ; mangroves ; fishery resources ; Zanzibar
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The distribution and growth forms of the mangroves on Zanzibar island (Unguja and Pemba) were investigated. Pemba island, with approximately 12000 ha of mangroves, had nine species; and Unguja island, with 6 000 ha, had eight. Average cropping intensities in Pemba island varied between 350–1937 cut plants per ha while in Unguja these were between 777–3567 cut plants per ha. In Pemba, mangrove forests were relatively less heavily exploited compared to those in Unguja, where clear felling was common. Charcoal, lime and salt production are the major activities which involve heavy utilization of mangrove wood. The fishery resources (shellfish and finfish) associated with the mangrove vegetation were also investigated by examining the composition of fish catches at landing stations in mangrove as well as nonmangrove zones of fishing districts. A survey on the fauna associated with mangrove forests was also conducted. A number of the local commercial fish species were found to be associated with the mangrove vegetation. The fishes of the genusLethrinus and the rabbit fishSiganus were found to constitute the bulk of the fish caught from waters adjacent to mangroves using movable traps. The molluscPyrazus sp., which is commonly used by the local people for food and bait, was found only in the mangroves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00008223
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    Paper (German National Licenses)
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  • 2
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    Status and exploitation of the mangrove and associated fishery resources in Zanzibar (1992)
    Springer
    Details
    Publication Date: 1992-11-01
    Print ISSN: 0018-8158
    Electronic ISSN: 1573-5117
    Topics: Biology
    Published by Springer
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    PAPER CURRENT
  • 3
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    Biological variation in Eledone cirrhosa (Cephalopoda:Octopoda): simultaneous comparison of North Sea and Mediterranean populations (1988)
    Institute of Malacology
    In:  Malacologia, 29 (1). pp. 77-87.
    Details
    Publication Date: 2020-07-15
    Description: Reproductive maturity and morphometric characteristics were compared for two samples of the octopus Eledone cirrhosa from geographically widely separated sites, Aberdeen, Scotland (320) and Banyuls, France (285).At the two locations the collecting period was synchronized (13 months) and laboratory procedures standardized. In both samples the sex ratio was strongly biased to females, which were about twice the body size of the males. Both sexes were significantly larger in the northern population. Analysis of a limited selection of morphometric characters (mantle, arms, brain and body weight) showed significant differences, but these were insufficient to confirm any divergence in body shape between the two populations.
    Type: Article , PeerReviewed
    Format: text
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    PAPER (OCEANREP)
  • 4
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    Population variation and growth in Loligo forbesi (Cephalopoda: Loliginidae) from Scottish waters (1993)
    Tokai University press
    In:  In: Recent advances in cephalopod fisheries biology. Tokai University press, Tokyo, pp. 49-59.
    Details
    Publication Date: 2021-01-19
    Description: Samples of Loligo forbesi were obtained from commercial sources and research cruises in Scottish waters for the period May 1984 to October 1986. The sea areas sampled fell into ICES fishery statistical sub-dividons VIb Rockall, VIa west coast, IVa nothern North Sea and IVb central North Sea. Within this area there were sexual and spatial variations in size, length-weight and body component/DML relationships. Males have larger overall mean size (DML and weight) and for both sexes the mean size of L. forbesi from the north eastern Atlantic is larger than those from the North Sea. The length-weight relationship in females was significantly different from that of males, and in both sexes the length-weight relationship was significantly different between samples from the north eastern Atlantic and those from North Sea waters. Multivariate analyses of fifteen morphometrical characters have identified variation in the morphometrics of L. forbesi within this range of distribution in Scottish waters. Growth rates were estimated for males and females separately from monthly increments in modes of length frequency histograms. Fishery recruitment occured mainly during April/May of each year at ~130mm DML (males) and ~100mm DML (females) followed by maximum growth rates of 286mm DML/month and 17.5mm DML/month respectively. There was some evidence for a second, weaker recruitment in November which showed slower growth rates.
    Type: Book chapter , PeerReviewed
    Format: text
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  • 5
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    The challenges of integrating marine sciences with coastal management in the western Indian Ocean region. (2005)
    Details
    Publication Date: 2021-05-19
    Description: About 30% of the 100 million inhabitants of the western Indian Ocean (WIO) region reside in the coastal strip and are heavily dependent on goods and services provided by oceans and coasts. Coastal areas provide food and resources which support the economies of coastal states of the western Indian Ocean such as fisheries, shipping, petroleum exploitation, seabed mining, energy and tourism. Coastal and marine areas house a bounty of biodiversity and the oceans are also responsible for balancing the extremes of climate conditions. However, our efforts to effectively manage the use of coastal resources in a sustainable manner are constrained by inadequate knowledge in the ecosystems and inadequate capacities to generate the knowledge. This is compounded by the lack of prioritisation of issues and integration of coastal and marine management and marine science in most maritime states. This paper examines the challenges in integrating ecosystem-level coastal and marine science with integrated coastal and marine management, as well as the opportunities for bridging the gap between science and coastal management in the western Indian Ocean. The integration of ecosystem management and ecosystem science will ensure the sustainability of the marine and coastal resources.
    Description: Unpublished
    Keywords: Marine sciences ; Coastal zone management
    Repository Name: AquaDocs
    Type: Working Paper , Non-Refereed
    Format: 90493 bytes
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  • 6
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    Coral Reef Biodiversity Loss (2005)
    Details
    Publication Date: 2021-05-19
    Description: htpp://economics.iucn.org
    Description: Coral reef ecosystems are under increasing natural and anthropogenic pressures, despite their ecological significance and economic importance to mankind. The majority of land based activities and direct human use are borne by these shallow water areas, which interface between land masses and the open oceans. The objective of this paper is to give an overview of the value of coral reef ecosystems and the anthropogenic threats imposed on them, as well as to examine the interactions of coral reef ecological linkages to other coastal and marine habitats and the future of coral reef ecosystems. It is suggested that management measures for the preservation of reef systems must link coastal and marine systems, pay attention to socio-economic factors as well as institutional and legal ones, employ a cooperative approach, and be based on scientific advice.
    Description: Published
    Keywords: Coral reefs ; Biodiversity
    Repository Name: AquaDocs
    Type: Report , Non-Refereed
    Format: 46300 bytes
    Format: application/pdf
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    PAPER (OA)
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