The relationship of temperature and hydrological factors to catch per unit effort, condition and size of the freshwater sardine, Limnothrissa miodon (Boulenger), in Lake Kariba

Chifamba, Portia Chiyedza

doi:10.1016/s0165-7836(99)00115-0

Cited by 27 publications

(18 citation statements)

References 21 publications

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“…Our results compliment several other studies that have linked gillnet CPUE to water temperature (Chifamba, 2000;Linløkken and Haugen, 2006). We estimated that maximum gillnet catchability occurs at 12.0 • C and that there is a 7-fold increase in catchability with variation in water temperature (once lake size has been accounted for).…”

Section: Discussionsupporting

confidence: 90%

“…This relationship likely occurs due to low levels of dissolved oxygen at low temperatures (Matthews and Berg, 1997) and cardiac stress at high temperatures (Farrell et al, 1996). Chifamba (2000) also found that a quadratic equation best described the relationship between CPUE and water temperature for freshwater sardin (Limnothrissa miodon) in Lake Kariba, Zimbabwe. Therefore, we assume that variation in temperature will directly affect activity rates, and thus the q parameter from Eq.…”

Section: Model Developmentmentioning

confidence: 86%

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Basin characteristics and temperature improve abundance estimates from standard index netting of rainbow trout (Oncorhynchus mykiss) in small lakes

et al. 2012

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Section: Discussionsupporting

confidence: 90%

Section: Model Developmentmentioning

confidence: 86%

Basin characteristics and temperature improve abundance estimates from standard index netting of rainbow trout (Oncorhynchus mykiss) in small lakes

et al. 2012

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“…Because of absence of long‐term lake water temperature data, air temperatures were used as surrogate temperatures. To obtain a time series of lake temperatures for the study period, the recorded lake temperatures were regressed against air temperatures, following the procedure of Chifamba (2000). Limnothrissa miodon catches were obtained from the Lake Kariba Fisheries Research Institute, which include data from the Zambian Department of Fisheries.…”

Section: Methodsmentioning

confidence: 99%

Indications of the effects of climate change on the pelagic fishery of Lake Kariba, Zambia–Zimbabwe

Magadza¹

2011

Lakes & Reservoirs

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The pelagic fishery of Lake Kariba comprises the introduced clupeid, Limnothrissa miodon, from Lake Tanganyika. The annual fishery catches grew logistically from 1974, when commercial fishing began. It peaked at 37 000 tonnes (estimated mean sustainable yield = 40 000 tonnes) around 1990 and declined steadily thereafter. A piecewise regression of Limnothrissa catches against time gives a breakpoint around 1987-1988. Regressions of Limnothrissa against air temperature and lake temperature gave breakpoints of 34.8 and 28.7°C, respectively. Other studies indicate that Lake Kariba has warmed by close to 2°C, with accompanying changes in thermal stratification. The lake phytoplankton is now dominated by Cyanophyceae, particularly Cylindrospermum raciborskii. The lake zooplankton population has greatly diminished. These data are similar to the results obtained for Lake Tanganyika (Nature 2003; 424, 766-8). In the Lake Tanganyika study, the declining pelagic fishery has been attributed to reduced food availability resulting from a reduced phototrophic zone depth, as well as epilimnion nutrient recharge from reduced mixing. The warming observed in Lake Kariba and its environs is consistent with the IPCC Fourth Assessment Report (AR4). While the effects of global warming have been observed in large natural lakes, this is the first study in which global warming has affected the ecosystem of a large impoundment.

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“…Thus, the collapse in catches occurred in the absence of any significant temperature change. Second, the epilimnetic temperatures had been projected beyond 1990 by means of a simple linear relationship between air temperature and the lake surface temperature, using data from Chifamba (2000). This projection might not be reliable, however, because the lake water temperature does not directly track the air temperature (Fig.…”

Section: The Pelagic Fisherymentioning

confidence: 99%

Climate change does not explain historical changes in the pelagic ecosystem of Lake Kariba (Zambia–Zimbabwe)

Marshall¹

2012

Lakes & Reservoirs

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Recent studies on the pelagic ecosystem of Lake Kariba identified a number of changes in its thermal regime, planktonic communities and fishery production, concluding they were the result of climate change, particularly warming. This study re‐examines these conclusions and suggests alternative explanations for these changes. Historical data suggest there was no warming of the lake until at least the 1990s. Furthermore, lack of recent data makes it difficult to conclude that the lake’s temperature has increased by 2 °C. It is also not clear that the pattern of thermal stratification has changed, or that the thermocline has risen and become more stable. Although one of the suggested effects of climate change was a decreased number of larger zooplankton, this change occurred in the 1970s, when there had been no change in the lake temperature. Rather, there is strong evidence that the zooplankton composition changed as a result of selective predation by the introduced clupeid, Limnothrissa miodon. Furthermore, the loss of large grazing zooplankton species could have affected the composition of the phytoplankton, although this phenomenon also has been attributed to climate change. Although the phytoplankton communities in the lake are not as well documented as the zooplankton communities, it is clear that many changes in the lake actually began in the 1970s. Finally, the decline in the pelagic fishery for Limnothrissa was also linked to temperature changes. However, because the fisheries on the Zambian and Zimbabwean sides exhibited very different behaviours, there is little evidence to support this conclusion. It is concluded that the impacts of climate change on Lake Kariba are likely to be complex and that possible over‐simplification in identifying these impacts will not facilitate our understanding of these complexities.

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The relationship of temperature and hydrological factors to catch per unit effort, condition and size of the freshwater sardine, Limnothrissa miodon (Boulenger), in Lake Kariba

Cited by 27 publications

References 21 publications

Basin characteristics and temperature improve abundance estimates from standard index netting of rainbow trout (Oncorhynchus mykiss) in small lakes

Basin characteristics and temperature improve abundance estimates from standard index netting of rainbow trout (Oncorhynchus mykiss) in small lakes

Indications of the effects of climate change on the pelagic fishery of Lake Kariba, Zambia–Zimbabwe

Climate change does not explain historical changes in the pelagic ecosystem of Lake Kariba (Zambia–Zimbabwe)

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