State of the Bay Report 2011-Final.pdf - Anchor Environmental

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State of Saldanha Bay & Langebaan Lagoon 2011 Fish samples collected during all other years were statistically similar, indicating no consistent change in the Big Bay surf zone fish community over time. Transform: Fourth root Resemblance: S17 Bray Curtis similarity 2D Stress: 0.19 year 1994 2005 2007 2008 2009 2010 2011 Figure 9.9. Multidimensional scaling plot showing similarities between the fish communities sampled at seven Big Bay sites during 1994, 2005, 2007, 2008, 2009, 2010 and 2011 sampling events. An MDS plot of Langebaan Lagoon fish samples shows some evidence of separation between sampling years with samples collected during 1994, 2007, 2010 and 2011 mostly grouping on the bottom and right of the MDS plot (Figure 9.10). The mixed model PERMANOVA test did indicate significant differences between sites (Pseudo F = 17.9, P< 0.001), between sampling events (Pseudo F = 4.2, P< 0.001) and a significant interaction effect (Pseudo F = 3.1, P< 0.001). Pairwise testing showed that fish samples collected during 1994, 2008 and 2011 were significantly different to those sampled during other years, but these were not consistent (Table 9.5). The 2011 lagoon samples were significantly different from four (all except 2007 and 2010 samples) of the previous six annual sampling events. SIMPER identified the high densities of harders, white stumpnose and Caffrogobius sp (goby species) and relatively lower densities of Psammogobius sp in the lagoon samples collected during 2011 as been the primary contributors (~80%) to the dissimilarity in samples between the 2011 and the significantly different 1994, 2005, 2008 and 2009 samples. The 2011 samples were most similar to the 2007 and 2010 samples when higher than average overall fish abundance was recorded, and as the dissimilarity to the other years is largely a result of increased abundance of the common species (as opposed to decreases or the absence of species) it appears that the near shore fish community within the lagoon is in an overall healthy state. 210 ANCHOR e n v i r o n m en t a l
State of Saldanha Bay & Langebaan Lagoon 2011 Fish Transform: Fourth root Resemblance: S17 Bray Curtis similarity 2D Stress: 0.24 year 1994 2005 2007 2008 2009 2010 2011 Figure 9.10. Multidimensional scaling plots showing similarities between the fish communities sampled at six Lagoon sites during 1994, 2005, 2007, 2008, 2009, 2010 and 2011 sampling events. Table 9.5. Results of the multivariate PERMANOVA pairwise tests between Langebaan lagoon fish samples collected in different years. NS: not significant, *: P < 0/05, **: P < 0.01 1994 2005 2007 2008 2009 2010 1994 2005 * 2007 NS NS 2008 NS NS * 2009 NS NS NS * 2010 * NS NS * NS 2011 ** * NS ** * NS 9.3.5 Status of the commercial and recreational white stumpnose fishery White stumpnose are the most important and recreational and commercial fish species landed within the Saldanha Bay- Langebaan lagoon system. Recreational boat and shore based angling for this species is arguably one of the largest draw cards for visitors and residents of Langebaan, whilst white stumpnose are a mainstay of the small commercial handline fishery that operates within the Bay. Data from access point (at slipways and harbours) and roving creel (along the shore line) surveys conducted over the period 2006- 2007 provided a valuable snapshot of this fishery (Naesje et al. 2008) and the results were reported on in the 2008 State of the Bay report. 211 ANCHOR e n v i r o n m en t a l
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