+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Fish communities of Geyser and Zelee coral banks Western Indian Ocean Peuplement ichtyologique des bancs de Geyser et Zelee Ocean Indien Occidental

Cybium. 31 Mars; 261: 11-26
Fish communities of Geyser and Zelee coral banks Western Indian Ocean Peuplement ichtyologique des bancs de Geyser et Zelee Ocean Indien Occidental
The ichtyofauna of Geyser and Zelee coral banks (north of Mozambique canal) was investigated in 1996, this work being the first quantitative study on this area. Quantitative data were collected on 11 stations (mean depth 18 m) by visual observations along 50 m transect, widened to 2 m for small sedentary species, and to 5 m for commercial species with a large action range. The main descriptors of the fish communities (species richness, abundance per species) and the trophic structure (omnivorous, herbivorous, carnivorous, browsers of sessile invertebrates) were described and analysed. A total of 294 fish species, belonging to 43 families were recorded. The species richness varied from 45 to 83 species / station, and the abundance, from 292 to 1322 individuals / 100 m2, the lower values being recorded on the inner slope and the higher ones on the outer slope. In terms of number of individuals, diurnal planktivores were highly represented at all sites (mean 63.7%). Pomacentridae and Caesionidae were the most abundant families, damselfishes being mainly represented by Chromis ternatensis (mean 73 ind., max. 148 ind. / 100 m2), C. dimidiata (mean 33 ind., max. 151 ind. / 100 m2) and Dascyllus carneus (mean 38 ind., max. 92 ind. / 100 m2), and fusiliers by Pterocaesio chrysozona (mean 19 ind., max. 128 ind. / 100 m2), P. tile (mean 12 ind., max. 38 ind. / 100 m2) and Caesio teres (mean 6 ind., max. 32 ind. / 100 m2). The high values recorded showed that small and isolated coral banks can support relatively rich fish faunas and substantial populations of individuals. This result may be explained by different factors such as the oceanographic circulation favourable to a localised enrichment of nutrients from surface water, the low human impact, a good coral cover and a high degree of self-recruitment associated with regional recruitment. Nevertheless, the main commercial species such as Lutjanus bohar and Variola louti, observed at each station, were represented at a low density (mean 0.8 ind., max. 6 ind. / 100 m2 and mean 0.2 ind., max. 0.8 ind. / 100 m2 respectively). This result may be due to the exploitation of these coral banks between 1990 and 1992, which was interrupted following the fast decreasing output. Such an experience shows us the fragility of these small coral banks and the necessity to establish a rational management of the resource.

(PDF 0-2 workdays service: $29.90)

Accession: 038251483

Related references

Peuplement ichtyologique des bancs de Geyser et Zelee (Ocean Indien Occidental). Cybium 26(1): 11-26, 2002

Geomorphologie et origine des bancs du nord-est du canal de Mozambique-Ocean Indien occidental--Geomorphology and origin of the reef-banks of the northeastern Mozambique Channel-western Indian Ocean. Marine Geology 47(1-2): 37-55, 1982

Characterizing fish communities associated with drifting fish aggregating devices (FADs) in the Western Indian Ocean using underwater visual surveys FT Caracteristiques des communautes de poissons associees aux DCP (dispositifs de concentration de poissons) observes en plongee dans l'ouest de l'ocean Indien.. 2007

Study of fish populations in marine reserves the case of Mayotte Island, Western Indian Ocean Reponses des peuplements et populations de poissons aux reserves marines le cas de lile de Mayotte, Ocean Indien occidental. Ecoscience, 34: 442-450, 1996

La ciguatera dans l'ocean Indien: etude des poissons veneneux des bancs de l'archipel des Mascareignes et de la crete centrale de l'ocean Indien. Revue des Travaux de l'Institut des Peches Maritimes, 424: 325-345, 1978

Report on Fantail Geyser and Ouzel Geyser, Cascade Group, Upper Geyser Basin, Yellowstone National Park, Wyoming. GOSA Transactions - The Annual Journal of the Geyser Observation and Study Association 1: 155-177, 1989

How does your geyser grow? 3-D laser scanning and preliminary (super 14) C dating of Castle Geyser, upper Geyser Basin, Yellowstone National Park, Wyoming. Abstracts with Programs - Geological Society of America 36(4): 15, 2004

Coral reef fish communities of Mayotte (western Indian Ocean) two years after the impact of the 1998 bleaching event. Marine and Freshwater Research 53(2): 107-113, 2002

Effects of fisheries closure size, age, and history of compliance on coral reef fish communities in the western Indian Ocean. Marine Ecology Progress Series 396: 99-109, 2009

Building Castle Geyser; geologic and chronologic interpretation of the development of Castle Geyser, Upper Geyser Basin, Yellowstone National Park, Wyoming, USA. Abstracts with Programs - Geological Society of America 37(7): 332, 2005