A report of the fisheries catch assessment survey in the Ugandan waters of Lake Victoria for the December 2006 survey

This catch assessment report provides the estimates of the quantities of fish landed in the riparian districts sharing the Ugandan waters of Lake Victoria; the monetary value of the fish catches; the contribution of different fish species to the total catches; and the trends of fish catch rates, total fish monthly catches for the sampled month since the beginning of the current catch assessment activities, i.e. July 2005 to December 2006.

Survey of past, present pollutants via sediment cores analysis in the coastal trend of Caspian Sea

This is especially well supported by down core variation Zn concentration. As Caspian Sea water intrudes into the Bay, it may be concluded that some part of pollution has sea origin. The geochemical index (Igeo) was reformulated for the area of study using chemical partitioning as well as Pb-210 results. The newly developed geochemical index is indicative of low to medium pollution intensity in the Bay of Gorgan. Thus, any additional pollution into the area of study may leave adverse effects on the aquatic ecology of Bay of Gorgan. Further, lithogenous and non-lithogenous inputs of metals into the Bay were assessed. For this purpose and through chemical partitioning, association of metals with different sedimentary phases was determined. The overall results show that about 114th total metal concentration have been added into the Bay of Gorgan through human activities.

Standing stock density estimates (kg/hectare) for fish from 1969 through 70 UNDP/FAO and 1976 EAFFRO trawl surveys in the Kenya waters of Lake Victoria

A statistical comparison of standing stock density estimates (Kg/hectare) from 26 UNDP/FAO 1%9 thru 70 and 63 EAFFRO 1976 bottom trawl surveys revealed the following; 1) Statistically significant differences between mean density values at 4 of 7 depths {4-9 to 30-39 m}. 2) The 1969 thru 70 UNDP/FAO Values were higher at the 4 levels. 3) No statistically significant menn density value differences at 3 depths (40-49 to 60-69 m), but decreased values for the 1976 EAFFRO survey at 40-49 and 50-59 m depth. It was concluded from these comparisons that no capital investment should be made into a trawler industry for fish meal production in the Kenya waters of Lake Victoria until further bottom trawl surveys can be conducted to either substantiate or disapprove these differences over the six year time span.

Final report of the fisheries catch assessment survey in the Ugandan waters of Lake Victoria for the May 2014 survey

This report presents findings of the CAS conducted in the Ugandan waters of Lake Victoria in December 2015. The results of the previous thirteen harmonized CASs conducted since July 2005 (July, August, September and November 2005; in March, August and December 2006; in March and August 2007; in February and December 2008; March 2010; May 2011 and May 2014) are included to show the emerging trends. The report also presents annual catch estimates for the Ugandan part of the lake from 2005 to 2015. This information together with other fish stock assessment and socio-economic monitoring survey data can now be utilized in the planning and management of the fisheries resources of Lake Victoria. The 2014 CAS results were very vital in the development of the Lake Victoria Fisheries Management Plan 2014.

Final report of the fisheries catch assessment survey conducted in December 2015 on the Ugandan waters of Lake Victoria

This CAS report provides estimates of the quantities of fish landed in the riparian districts sharing the Ugandan waters of Lake Victoria; the monetary value of the fish catches; the contribution of different fish species to the catches; and the trends in fish catch rates, and the monthly catches for the sampled month since the beginning of harmonized CAS activities in July 2005 to December 2015. The report also compares the annual catch and gross beach value of catch landings in 2005, 2006, 2007, 2010, 2014 and 2015. A total of 15 CASs have been undertaken in the Uganda sector of the lake with data gaps in 2009, 2012 and 2013 due to financial constraints. The annual catch estimates for the years 2010, 2011, 2014 and 2015 were based on one sampling covering the rainy season and may not capture changes that could occur in dry season. There is need to include dry season sampling in future surveys.

Survey on gill parasites of sturgeon fishes (Acipenseridae) in southern part of Caspian Sea with emphasis on Nitzschia sturionis Ablidgaard, 1794

Sturgeons are important because of producing the expensive caviar. With regard to decreasing of natural stocks of these fishes, cultured sturgeons farms are expanding, so infectious or non-infectious agents can cause problems in this industry. One of the most important infectious diseases, are parasitic diseases, like gill parasites. In this study from March 2007 to June 2008, gills of 122 sturgeons of south west of Caspian Sea, 44 samples of juveniles from freshwater farms and 25 samples of cultured fishes in freshwater were collected and examined. Parasites were separated and determination of species and prevalence of them were done. Nitzschia sturionis and Diclybothrium armatum (monogenea) with general prevalence 8.7% in Acipenser persicus and 25.6% in Acipenser stellatus from sea sturgeons and Trichodina (sp.1, sp.2) and Ichthyophthirius multifiliis from freshwater sturgeons, were separated. Statistical analysis was done according to species, sex, length and weight of fishes. Pathology, morphometric and morphological characters of Nitzschia sturionis were also studied. At the end, we have suggested ways for health management of farms for prevention of parasites entry.