Table 2.
Microcystin concentrations in fish from all study sites.
| Name | Microcystin (μg/kg wet weight)
|
||
|---|---|---|---|
| n | mean ± s.d. | range | |
| Lake Albert | |||
| Lates niloticus (> 25 cm) | 5 | 6.7 ± 3.5 | 3.9–11.6 |
| Tilapia zilli | 5 | 4.0 ± 1.3 | 2.7–6.2 |
| Lake Edward | |||
| Bagrus docmac | 5 | 6.2 ± 3.0 | 2.1–9.3 |
| Barbus bynni | 5 | 5.5 ± 2.7 | 1.3–8.6 |
| Clarias gariepinus | 5 | 8.6 ± 7.5 | 2.0–21.3 |
| Haplochromis spp. | 5 | 10.0 ± 3.2 | 5.2–13.6 |
| Haplochromis squamipinnis | 5 | 8.6 ± 3.4 | 3.7–12.6 |
| Oreochromis leucostictus | 4 | 21.9 ± 30.7 | 2.9–67.7 |
| Oreochromis niloticus | 20 | 6.7 ± 4.5 | 1.1–16.7 |
| Protopterus aethiopicus | 5 | 5.3 ± 4.9 | 1.4–13.4 |
| Lake George | |||
| Bagrus docmac | 5 | 9.4 ± 6.9 | 4.4–21.2 |
| Clarias gariepinus | 5 | 6.9 ± 2.0 | 4.4–9.9 |
| Haplochromis spp. | 5 | 5.6 ± 4.7 | 2.6–13.7 |
| Haplochromis squamipinnis | 4 | 6.7 ± 3.5 | 2.9–9.9 |
| Haplochromis squamipinnis (whole) | 1 | 11.8 | ~ |
| Oreochromis esculentus | 4 | 13.8 ± 6.5 | 6.3–21.5 |
| Oreochromis leucostictus | 5 | 21.2 ± 32.3 | 0.9–78.4 |
| Oreochromis niloticus | 18 | 10.2 ± 8.6 | 1.7–33.9 |
| Protopterus aethiopicus | 5 | 2.4 ± 1.2 | 1.5–4.6 |
| Tilapia zilli | 1 | 2.0 | ~ |
| Lake Mburo | |||
| Bagrus docmac | 1 | 13.4 | ~ |
| Clarias gariepinus | 5 | 20.6 ± 19.5 | 3.0–51.3 |
| Haplochromis spp. | 4 | 6.4 ± 3.9 | 2.5–11.8 |
| Haplochromis spp. (whole) | 1 | 12.1 | ~ |
| Oreochromis esculentus | 6 | 23.9 ± 18.4 | 1.3–54.2 |
| Oreochromis leucostictus | 5 | 8.4 ± 6.7 | 2.2–16.2 |
| Oreochromis niloticus | 15 | 7.4 ± 7.6 | 1.3–23.6 |
| Protopterus aethiopicus | 5 | 2.3 ± 2.1 | 0.8–6.1 |
| Lake Nkuruba | |||
| Oreochromis leucostictus | 10 | 7.2 ± 5.1 | 1.6–17.2 |
| Poecelia reticulata (whole) | 2 | 38.9 ± 48.6 | 4.5–73.3 |
| Tilapia zilli | 9 | 10.0 ± 5.5 | 2.1–19.3 |
| Tilapia zilli (whole) | 3 | 49.2 ± 11.4 | 42.5–62.3 |
| Lake Saka | |||
| Astatoreochromis alluaudi | 4 | 56.1 ± 94.4 | 7.1–197.7 |
| Astatoreochromis alluaudi (whole) | 1 | 32.5 | ~ |
| Barbus neumayerii | 1 | 9.5 | ~ |
| Haplochromis spp. | 8 | 719.4 ± 800.3 | 9.5–1917 |
| Haplochromis spp. (whole) | 2 | 21.3–215.2 | ~ |
| Lates niloticus (> 25 cm) | 4 | 16.4 ± 18.3 | 4.1–43.7 |
| Oreochromis niloticus | 19 | 19.3 ± 19.4 | 0.8–63.4 |
| Lake Victoria (Murchison Bay) | |||
| Clarias gariepinus | 1 | 23.9 | ~ |
| Haplochromis spp. | 4 | 35.6 ± 36.3 | 9.0–88.9 |
| Haplochromis spp. (whole) | 1 | 19.9 | ~ |
| Lates niloticus (< 25 cm) | 7 | 21.2 ± 14.8 | 3.1–49.5 |
| Lates niloticus (> 25 cm) | 17 | 8.0 ± 6.8 | 1.3–25.0 |
| Oreochromis leucostictus | 5 | 30.3 ± 18.1 | 14.9–59.8 |
| Oreochromis niloticus | 28 | 12.8 ± 11.9 | 1.4–57.7 |
| Protopterus aethiopicus | 5 | 4.1 ± 2.4 | 1.7–7.7 |
| Rastrineobola argentea (whole) | 2 | 36.2–41.2 | ~ |
| Synodontis spp. | 10 | 22.8 ± 17.1 | 3.8–64.4 |
| Tilapia zilli | 5 | 15.4 ± 10.8 | 7.1–33.8 |
| Lake Victoria (Napoleon Gulf) | |||
| Astatoreochromis alluaudi | 1 | 6.2 | ~ |
| Bagrus docmac | 1 | 15.1 | ~ |
| Brycinus sadleri | 1 | 24.6 | ~ |
| Haplochromis spp. | 5 | 15.2 ± 8.0 | 2.8–24.2 |
| Lates niloticus (< 25 cm) | 6 | 12.4 ± 7.0 | 3.9–23.5 |
| Lates niloticus (> 25 cm) | 17 | 5.9 ± 4.9 | 0.5–16.7 |
| Mormyrus kannume | 5 | 21.1 ± 7.1 | 12.5–29.8 |
| Oreochromis leucostictus | 2 | 3.2–4.3 | ~ |
| Oreochromis niloticus | 24 | 9.7 ± 7.6 | 1.2–29.1 |
| Oreochromis variabilis | 5 | 30.1 ± 34.1 | 3.5–87.6 |
| Protopterus aethiopicus | 5 | 2.8 ± 1.3 | 1.1–4.5 |
| Rastrineobola argentea (whole) | 8 | 80.9 ± 36.0 | 39.0–128.5 |
| Synodontis spp. | 7 | 22.8 ± 15.0 | 8.2–44.9 |
| Tilapia zilli | 5 | 7.4 ± 4.0 | 3.4–14.1 |
| Lake Ontario (Bay of Quinte) | |||
| Alosa pseudoharengus (alewife) | 3 | 25.9 ± 10.1 | 20.0–37.5 |
| Ameiurus nebulosus (brown bullhead) | 6 | 4.4 ± 0.6 | 3.3–5.0 |
| Aplodinotus grunniens (freshwater drum) | 3 | 0.8 ± 0.3 | 0.5–1.1 |
| Esox lucius (northern pike) | 8 | 10.2 ± 7.6 | 1.6–25.8 |
| Lepomis gibbosus (pumpkinseed) | 4 | 1.9 ± 1.0 | 0.7–2.9 |
| Lepomis macrochirus (bluegill) | 1 | 4.8 | ~ |
| Morone americana (white perch) | 9 | 4.5 ± 4.1 | 0.7–14.8 |
| Perca flavescens (yellow perch) | 7 | 3.1 ± 2.0 | 0.5–5.6 |
| Pomoxis nigromaculatus (black crappie) | 2 | 1.7 ± 0.3 | 1.5–1.9 |
| Stizostedion vitreum (walleye) | 14 | 2.1 ± 1.6 | 0.5–6.1 |
| Lake Erie (Western Basin) | |||
| Aplodinotus grunniens (freshwater drum) | 2 | 2.4 ± 6.0 | 1.7–10.1 |
| Coregonus clupeaformis (whitefish) | 5 | 4.1 ± 1.0 | 2.9–5.4 |
| Micropterus dolomieu (smallmouth bass) | 5 | 13.4 ± 17.8 | 1.5–43.6 |
| Morone americana (white perch) | 6 | 5.6 ± 4.9 | 1.9–15.0 |
| Morone chrysops (white bass) | 5 | 18.3 ± 8.7 | 4.2–27.1 |
| Perca flavescens (yellow perch) | 4 | 5.0 ± 1.4 | 3.6–7.0 |
| Stizostedion vitreum (walleye) | 5 | 23.9 ± 17.2 | 5.3–41.2 |
Where samples represent fish that were analyzed whole, this has been indicated in parentheses after the species name. All other values in this table are for fish muscle tissue.