Fish species abundance and distribution in The Gambia estuary

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Darboeencountered as far up as Papa Island. The distribution of S. gambiensis shrank byabout nine stations from around Bintang confluence to Tendaba while S. intermediusretreated from Tendaba to around Jurong and Devils points. On the whole, during thesurvey the highest recording of species occurrence was made in the lower estuarywith the exception of Banjul (station 2), and Lamin village (station 5). In this zone thehighest was recorded at Lamin point, Chitabong, Mandina bolong, Tabiere creek andMuta point and the bulk of the species that formed this included P. elongatus, I.afrcana, E. fimbriata, S. maderensis, species of the Ariidae family and the crabCallinectae latimanus. Climatically, the month of April is considered one of thehottest months in the Gambia with mean atmospheric temperatures reaching upto39.3°C. Results of the present study also characterised that month as a period ofweak freshwater discharge into the estuary (Figure 3). Fish samples taken from theestuary in April 2002 indicate ubiquitous distribution of some commercially importantspecies such as P. elongatus, P. notialis. E. fimbriata and Polydactylus quadrifili(POQ), Liza grandisquamis and L. Falcipinnis. It is during this survey that theconcentration of species throughout the estuary appears almost even with occurrencein the upper estuary almost equating with those of the lower and mid estuarine zones.UNU – Fisheries Training Programme 22
Darboe25201510501/12/200025202-12/6 /2001151050Number of species2520151050252016-25/9/20013-12/12/2001151050252015-24/4/2002151050135791113151719212325272931333537394143StationFigure 11: Number of species for each sampling station in the five surveys of theGambia estuary.UNU – Fisheries Training Programme 23
Page 3 and 4: DarboeLIST OF FIGURESFigure 1: Map
Page 5 and 6: DarboeShrimp harvests are purchased
Page 7 and 8: Darboe2 LITERATURE REVIEW2.1 Genera
Page 9 and 10: Darboe3 MATERIALS AND METHODS3.1 Or
Page 11 and 12: Darboe4 RESULTSThe area covered by
Page 13 and 14: Darboeand the lowest, 23.8 o C, at
Page 15 and 16: DarboeFigure 6: Distribution of Syn
Page 17 and 18: Dissoled oxygen (mgl-1)7,56,55,54,5
Page 19 and 20: DarboeStation0135791113151719212325
Page 21: Darboeother surveys), the zone of t
Page 25 and 26: DarboeFigure 14: Aggregated number
Page 27 and 28: Darboeexplanation for low oxygen co
Page 29 and 30: DarboeACKNOWLEDGEMENTSI express gra
Page 31 and 32: DarboeAPPENDIX : TABLES OF DATA REC
Page 33 and 34: DarboeTable 3: Records of environme
Page 35 and 36: DarboeTable 5: Species occurrence a
Page 37 and 38: DarboeTable 7: Species occurrence a
Page 39 and 40: DarboeTable 9: List of fish epecies

Fish species abundance and distribution in The Gambia estuary

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