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• W2227707807 abstract "This study investigated some of the variables that influence the fishery of Limnothrissamiodon (kapenta) in Lake Kariba, namely, biological (limnological factors, zooplanktoncomposition and densities) and economic (fishing effort and profitability in the industry). Thefindings were then assessed to identify relationships with kapenta catches.There were indications that the Lake had warmed up since limnological findings made inprevious studies. The mean depth profile temperature recorded for July 2011 of 22.9ÂoC was4.3ÂoC higher than the mean depth profile temperature recorded for the same month from1987-1999. The mean depth profile temperature value also represented a 5.1ÂoC increase overthe mean depth profile temperature recorded in 1967-1968. Thermoclines and oxyclines inthe open water stations were established at depths between 5 and 10 m during the cool dryseason and post-turnover period, which agrees with recent observations that the thermoclineis migrating upwards. The Annual Birgean Heat Budget was 18 869 cal. cm-2 year-1, anincrease of 4 800 cal. cm-2 year-1 from the data for 1967-68. It is clear the heat content of thelake has increased by about 25% in the last 45 years consistent with recent results on thepossible impact of global climate change on lake temperatures and heat content.The zooplankton composition and densities in the Sanyati Basin were assessed to validatewhether zooplankton densities had declined to the extent of limiting food availability ofLimnothrissa miodon. The composition and densities were compared with historical records.There were indications in this study that zooplankton densities have declined considerably inLake Kariba over the past 25 years. Bosmina longirostris, which recorded peak densities of16 ind./L and 11 ind./L during the turnover period in 1986 and 1987 respectively, onlyrecorded a density of almost 0.5 ind./L in July 2011.In 2011 the Sanyati Basin (Basin 5) was the most productive basin in Lake Kariba with over60% of the total annual catch recorded on the Zimbabwean side. However the catch per uniteffort (CPUE) slumped from 0.6 in 1997 to 0.13 in 2009. The extent of low catches wasexemplified by the total mean monthly catch recorded for Basin 4 of 47.0 tonnes, which waslower than the mean catch recorded for a single rig in 2000 (50.2 tonnes). A comparison ofMSY estimates with the trend in annual catches indicated that the MSY was surpassed in themid 1980s. The argument about the infinite resilience of L. miodon given the current fishingpressures needs to be revisited. The trend in catch per unit effort suggests that the lake iscurrently experiencing a high fishing pressure and there is need for measures to control this.An assessment of the profitability of the industry showed that the industry was viable despitechallenges of declining fish stocks. However, it was predicted that if this trend in decliningcatches continues small companies will shut down as it will not be economically viable.Consequently, the structure of the industry will revert to being inequitable as was the casepre-1990 and the whole diversification of the sector would have failed. From this study it isrecommended that the National Parks and Wildlife Authority addresses the problem of illegalfishing and thefts. There is also need to reduce and rationalise fishing effort in Lake Kariba.Further research is recommended to fully understand the food web dynamics in lake given thelimnological changes that have taken place." @default.
• W2227707807 created "2016-06-24" @default.
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• W2227707807 date "2014-07-17" @default.
• W2227707807 modified "2023-09-27" @default.
• W2227707807 title "A study of the biological and economic factors affecting the kapenta (Limnothrissa miodon) population and yield in Lake Kariba" @default.
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