Fisheries in the Southern Border Zone of Takamanda - Impact ...

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146 Migrating Labeo spp. make up 10% of all recorded catches. This level is probably much higher when one includes catches during annual migrations. The commercial importance of these fish presents a case for controlling the fishing effort during their migration in November. Within the forest streams, large breeding migrations of four species were recorded between October and December. The most common was migration of Labeo batesii, Hemigrammopetersius brevidorsalis, and Barbus sp. Similar migration of L. batesii have been reported in streams of nearby Okwangwo Division of Cross River National Park at the villages of Bemi, Okwa I, Okwa II, and Kanyang (King 1997). Large-scale fish migrations of Labeo coubie were also reported by Simon (1998) for the same area of the national park. 4.7 Fish Species Caught About 40% of the adult populations (above 15 years in age) in the villages fish, mostly for home consumption. Fish that are sold are either fresh (50%) or smoked (50%). Figure 2 shows the main fish groups harvested using various fishing gear. Fishermen stated that cichlids dominate in their catch followed by predatory Hydrocynus sp. and Hepsetus sp. The Clariidae—for example, Clarias, Mochokidae, and Bagridae—are also abundant. Popular fish for consumption in the area are Tilapia, Crow–crow nose, Mbanga, Mudfish, Dog fish, and Snake fish (see Appendix 1 for common and specific names). It is interesting that predators such as Hydrocynus vittatus, Hydrocynus brevis, and Hepsetus odoe figure behind prey fish such as cichlids in the catch. This may indicate an abundance of prey species and perhaps a healthy fishery. The presence of flooded forest banks undoubtedly assists predators, providing “lay in wait and stealth” habitat for effective predation. Snake fish (Mastacembelidae) are also high on the list of species captured, possibly because they are easy to catch and therefore frequently mentioned. Not surprisingly, the Siluriformes (Clarias sp. and Barbus sp.), ideally suited to the riverine/stream environment Takamanda: the Biodiversity of an African Rainforest and able to withstand low levels of oxygen in flooded areas, were also on the list, in fourth and fifth places. Bagridae and Mochokidae were also represented. 4.8 Estimate of Fish Production Extrapolating the sample to the total number of fisherfolk in the survey area and multiplying by the CpUE recorded from Bache and Kajifu villages and activity data from the individual questionnaire survey resulted in a yield estimate of 106.3 tons for November (Table 3). The methodology used here is a standard practice for determination of fish yields in African rivers (Welcome 1976). It is likely that annual yields may differ from that obtained through simple multiplication by 12 months, given the varying levels of activity and CpUE expected during the dry season. Levels of monthly activity obtained from the questionnaire survey were multiplied by the November CpUE (assumed constant) to more accurately project the annual yield and to give an idea of the expected monthly variation (Figure 3). The result was an estimated annual yield of 1,056 ton, worth approximately FCFA 400 million, or about $700,000. 4.9 Fish Biodiversity Mdaihli et al. In the southern sector of TFR along the Munaya River, some 54 fish species belonging to 22 families have been recorded to date (Appendix 1). While not exhaustive, this list compares favorably with that of the Okwangwo Division of the Cross River National Park, whose tributaries also partly drain the greater portion of the study area. For the Okwangwo Division, King (1997) recorded 31 species representing 6 orders and 9 families. Several of the 90 species from the upper Cross River (Reid 1989) were confirmed as endemics, including Tetraodon pustulatus, Gobiocichla trewavasae, Afromastacembelus sexdecimspinus, and a new species of Leptocypris. Literature on the fishery in the region is almost solely centered on checklists and descriptions of fish species, with little emphasis on the overall fishery (Moses 1981, 1987; Reid 1989; Schliewen 1996; King 1997; Simon 1998). Teugels et al. (1992) provides the most
Fisheries Surveys Eleotridae sp. Mormy rids Citharinidae/Dishicho Mochokidae Bagridae Lates/Poly centropsis Clarias sp. Barbus/Alestes Mastacembelidae Hy rocy nus/Hepsetus Tilapia Labeo sp. Eleotridae sp. Citharinidae/Dishicho Bagridae Lates/Polycentropsis Mormyrids Clarias sp. Mastacembelidae Barbus/Alestes Hyrocynus/Hepsetus Labeo sp. Tilapia Raiamas sp. Eleotridae sp. Lates/Polycentropsis Clarias sp. Labeo sp. Barbus/Alestes Mastacembelidae Hyrocynus/Hepsetu Tilapia Raiamas sp. Bagridae Eleotridae sp. Labeo sp. Turtle Barbus/Alestes Lates/Polycentropsis Tilapia Hyrocynus/Hepsetus Mastacembelidae Clarias sp. 0 5 10 15 20 Percentage frequency Gill Net Sample size: 1,335 0 5 10 15 20 Percentage frequency Cast net Sample size = 791 0 5 10 15 20 Percentage frequency Hand net Sample size: 186 No 1 Hook Sample no: 635 0 5 10 15 20 25 Percentage frequency Figure 2. Frequency of species groups caught in the border zones south of Takamanda Forest Reserve, Cameroon. 147 SI/MAB Series #8, 2003
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Smithsonian Institution SI/MAB Biod
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ii 10. Fisheries in the Southern Bo
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Mercy Abwe Dione Dept. of Biology,
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The Smithsonian Institution has lon
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The editors of this publication ext
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18 Takamanda: the Biodiversity of a
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20 Sunderland et al. preliminary la
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24 Sunderland et al. Table 2. Summa
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26 Sunderland et al. lowland forest
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28 Sunderland et al. impressive cat
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38 Sunderland et al. monitoring pro
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40 Sunderland et al. Letouzey, R. 1
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42 Sunderland et al. Appendix 1. Pl
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44 Sunderland et al. Agelaea pentag
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46 Sunderland et al. Afzelia pachyl
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48 Sunderland et al. Rhabdophyllum
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50 Sunderland et al. Aningeria robu
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52 Sunderland et al. Nervilia sp. P
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56 O’Kah f22 y2@w—˜A g—22@IE
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58 O’Kah Table 3. Species found i
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60 O’Kah Table 6. Indicators of s
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62 O’Kah Larsen, T. B. 1997. Butt
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64 O’Kah Appendix 1 (cont.). Chec
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66 O’Kah Appendix 1 (cont.). Chec
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68 O’Kah Species distribution Tak
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70 O’Kah Species distribution Tak
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72 Takamanda: the Biodiversity of a
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74 h—2@y——A 2 IE2— y2@w—
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76 The sites which have been survey
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78 species from a phylogenetic poin
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82 Family / Species Notes Locations
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84 LeBreton et al. 3 Methods A team
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92 LeBreton et al. Appendix 1 (cont
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94 LeBreton et al. Appendix 1 (cont
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