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The effect of storage temperatures on the microbiological quality of fish feeds

100%

Zmyslowska I., Lewandowska D.

Polish Journal of Environmental Studies

2000

tom 09

nr 3

Temperature is a factor which affects microbiological quality of feeds during their storage. Three storage temperatures of the feeds for fish were taken into account in this study: -11°C, 5°C and 20°C. Analyses comprised the survival of proteolytic, ammonifying, psychrophilic and mesophilic bacteria as well as fungi. It was found that after 72-day storage of fish feed at the three temperatures, fungi showed the highest survival (56% - 80%). As regards the four physiological groups of bacteria, the highest survival was observed for mesophilic bacteria (6.25% - 9.58%), followed by psychrophilic ones (2.5 - 3.25%) and ammonifiers (0.07 - 0.11%), while proteolytic bacteria showed the lowest survival (0%). No live cells of the latter bacteria were observed after 64-day storage of the feed at -11 and 5°C, and after 72-day storage at 20°C.

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What is the diet of Palaemon elegans Rathke, 1837 (Crustacea, Decapoda), a non-indigenous species in the Gulf of Gdańsk (Southern Baltic Sea)?

61%

Janas U., Baranska A.

Oceanologia

2008

tom 50

nr 2

221-237

Palaemon elegans, a new component of the Gulf of Gdańsk macrozoobenthos, colonised the southern Baltic coastal zone in the late 20th and early 21st century. Analysis of the stomach contents of P. elegans revealed 16 plant and animal taxa that these prawns had fed on. The principal dietary component was detritus, with a mean frequency of occurrence in stomachs of > 80%. The most frequently occurring plant components in the diet were algae from the genus Cladophora and the family Ectocarpaceae, while the most significant animal components were Harpacticoida, Chironomidae, Ostracoda and Gammarus spp. The results of the study show that the dietary composition of P. elegans differed significantly between stations and months. The foraging area consisted of two distinctive regions – the Inner Puck Bay, and the Outer Puck Bay together with the Dead Vistula River; two of the stations – Gdynia and Sopot – were distinct from all the others. However, no obvious seasonality in the food composition could be demonstrated.

Ograniczanie wyników

1 Oceanologia

1 Polish Journal of Environmental Studies

1 Baranska A.

1 Janas U.

1 Lewandowska D.

1 Zmyslowska I.

1 2008

1 2000

Wyniki wyszukiwania

The effect of storage temperatures on the microbiological quality of fish feeds

What is the diet of Palaemon elegans Rathke, 1837 (Crustacea, Decapoda), a non-indigenous species in the Gulf of Gdańsk (Southern Baltic Sea)?