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    Growth and Maturation of Plectropomus spp. in the Saudi Arabian Red Sea

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    Type
    Thesis
    Authors
    DesRosiers, Noah
    Advisors
    Berumen, Michael L. cc
    Committee members
    Choat, John
    Luyten, James
    Program
    Marine Science
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Date
    2011-05
    Permanent link to this record
    http://hdl.handle.net/10754/209394
    
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    Abstract
    Two species of plectropomid grouper (Plectropomus areolatus and P. pessuliferus) are found in the Red Sea. In Saudi Arabia these are the most valuable fishes by weight, averaging wholesale prices around US $$$15 per kilogram (personal observation). Over the past two decades, the number of fishing vessels in the Saudi Arabian Red Sea has tripled. Despite this increase in fishing effort Saudi Arabia has not implemented any marine resource management for Red Sea fisheries. Little biological data are currently available to inform managers. The research presented here addresses knowledge gaps on the growth pattern, longevity and sexual ontogeny of Plectropomus spp. in the Red Sea. Collections of each species were established by purchasing landed individuals from fishermen and fish markets distributed evenly between three latitudinal regions around the country. The total length of each fish was measured to the nearest millimeter. Age was estimated by enumerating annual bands visualized in transverse sections of sagittal otoliths. Sexual stage was determined via histological examination of gonadal tissue. Plots of total length versus age were fitted with reparameterized von Bertalanffy growth functions constrained to a size-at-settlement estimate of 20 mm. P. pessuliferus achieved a larger size (maximum 960 mm) and an older age (maximum 19 years) than P. areolatus (maximum size 570 mm, maximum age 9 years). While no regional patterns were found for P. pesuliferus, likelihood ratio tests revealed regional differences in growth pattern for P. areolatus, finding an increasing mean age, increasing mean length, and decreasing growth rate with decreasing latitude. In addition, males of P. areolatus were more abundant in the Southern region. These findings contradict existing theories about the effects of latitudinal temperature gradients on life history. It is hypothesized that the broader continental shelf in the Southern region may be providing a haven for these species in the form of reduced fishing pressure, increased habitat, and increased abundance of prey organisms due to greater regional productivity. Given all of this information, it is recommended that a comprehensive fisheries management regime be implemented, starting with an immediate return to previously-used spawning season closures and working towards spatial closures and size limits.
    Citation
    DesRosiers, N. (2011). Growth and Maturation of Plectropomus spp. in the Saudi Arabian Red Sea. KAUST Research Repository. https://doi.org/10.25781/KAUST-7AN55
    DOI
    10.25781/KAUST-7AN55
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-7AN55
    Scopus Count
    Collections
    Biological and Environmental Sciences and Engineering (BESE) Division; Marine Science Program; Theses

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