We consider the potential for using prices as leading indicators of changes in stocks and yields in the freshwater capture fishery in Lake Victoria. Fertilizer run-off from agricultural land is a major cause of nutrient loading, along with soil erosion, atmospheric deposition, and point pollution from industrial and domestic affluent. The interactions between fertilizer applications, water qual...

The population size of fish stock is affected by the variability of its environment, both biologic and economic. The classical logistic growth equation is applied to simulate fish population dynamics. Environmental variation was included in the optimization of harvest to obtain a relation in which the maximum sustainable yield and biomass varied as the environment varied. The fluctuating enviro...

The nominal fish harvest of 100 X 10” t reported for 1993, while exceeding many early predictions of “potential yield” remains well below some other, more optimistic predictions. The key elements of a sample of prediction of marine fish potentials are reviewed, enabling identification of their shared features. One of these is the tendency for initial guesses (e.g. of the relations between optim...

Bacteriocins are ribosomally produced peptides useful for food biopreservation. An improved adsorption-desorption process is proposed for the partial purification of the bacteriocin produced by the fish isolate Carnobacterium maltaromaticum C2. Analyzis of extract by SDS-PAGE indicated this method may offer an alternative to improve the yield of purification of bacteriocins.

Piscirickettsia salmonis was grown in established insect, frog, and fish tissue culture cells. The yield of P. salmonis in Sf21 cells was up to 100 times that obtained in CHSE-214 cells, and virulence for Atlantic salmon was retained. The ceiling temperature for growth of P. salmonis in Sf21 cells was 24 degrees C.

With the purpose of determining the principal food resources responsible for maintaining the fishery yield in a section of the São Francisco River, 6 sampling of the fish fauna were made downstream from the Três Marias Dam, from September 1996 to July 1997. A total of 1,127 individuals of 35 species were captured, using gillnets with mesh sizes varying from 3 to 16 cm. The stomach contents of 3...

In this paper, we synthesize available information on the links between changes in ecosystem loading of inorganic mercury (Hg) and levels of methylmercury (MeHg) in fish. Although it is widely hypothesized that increased Hg load to aquatic ecosystems leads to increases in MeHg in fish, there is limited quantitative data to test this hypothesis. Here we examine the available evidence from a rang...

During a controlled 6-month study using six replicated water recirculation aquaculture systems (WRASs), it was observed that Rainbow Trout Oncorhynchus mykiss in all WRASs exhibited a higher-than-normal prevalence of side swimming (i.e., controlled, forward swimming but with misaligned orientation such that the fish's sagittal axis is approximately parallel to the horizontal plane). To further ...

The present investigation has been designed to prepare the organic fertilizer from fish waste and study efficacy of on growth yield plants Amaranthus dubius (amaranthus) Trigonella foenum- graecum (coriander). Fish wastes collected slaughter house converted into nutrient quality in terms protein, carbohydrate, nitrogen, phosphorous potassium contents were tested using standard procedures. For a...