Search USGS⌕ Search

Geology topics

K. Fynn-Aikins

Publications and source records attributed to K. Fynn-Aikins.

9 recordsLinked to original sources
USGS1998

Growth and survival of lake sturgeon larvae fed formulated diets

We conducted a 60‐d experiment to ascertain diet‐related differences in survival and growth of larval lake sturgeon Acipenser fulvescens. We offered formulated diets to larval lake sturgeon 2 weeks after first‐feeding to find a suitable formulated diet. The five formulated diets were fed to larvae in combination with live brine shrimp Artemia sp., which served as a control. There was no diet effect ( P ≤ 0.05) on mean survival, which ranged from 67.4% to 58.3%. Lake sturgeon fed only brine shrimp were significantly greater in mean length (60.4 mm) at 68 d of age than all other treatments, and BioKyowa produced the lowest (44.2 mm) mean length. Mean weight of fish provided brine shrimp (0.74 g) was significantly greater than the weights of those fed the Tunison, Biodiet, or BioKyowa diets. There was no indication that larval lake sturgeon had consumed the formulated feeds; rather, it is likely they may have become imprinted on brine shrimp during the 2 weeks immediately following the onset of exogenous feeding.

Progressive Fish-Culturist↗
USGS1998

Effect of dietary amprolium on tissue thiamand Cayuga syndrome Atlantic salmon

Broodfish of Atlantic salmon Salmo salar were fed either thiamin-deficient diets fortified with 0.05% and 0.1% amprolium chloride (Amp, a thiamin antagonist) or thiamin-sufficient diets (0% Amp and ASD2-30, a U.S. Fish and Wildlife Service open-formula feed) for 6 months before spawning. We observed Cayuga syndrome (CS) only in the fry produced from broodfish fed the amprolium diets. The percent fry mortality due to CS was less than 1% in the 0.05% Amp group and was more than 3% in the 0.1% Amp group. Free thiamin was the predominant form of thiamin in the eggs of all broodfish; concentrations were two orders of magnitude greater than that of thiamin pyrophosphate (TPP) and thiamin monophosphate (TMP). Free thiamin was greatest in eggs of broodfish fed the thiamin-sufficient diets. Total thiamin and TMP in red blood cells (RBCs) of broodfish fed the thiamin-deficient diets were reduced to the initial levels by the end of the study. Levels of free thiamin in RBCs were similar in all treatment groups at spawning, as were levels of TPP. Amprolium feeding significantly reduced total thiamin levels in heart, liver, and muscle but not in kidney. Except for thiamin found in eggs, TPP was the predominant form of thiamin in all the other tissues, whereas free thiamin was the least predominant. The data support the hypothesis that thiamin deficiency may cause Cayuga syndrome in Atlantic salmon sac fry. The low incidence of the syndrome in this study may be due to the short duration of the feeding trial or to the low levels of amprolium added to the diets.

Transactions of the American Fisheries Society↗
USGS1996

Feeding trials with juvenile Atlantic sturgeons propagated from wild broodstock

Juvenile Atlantic sturgeons Acipenser oxyrinchus produced by hormone‐induced spawning of wild broodstock from the Hudson River, New York, were used in a diet study. Fish fed live Artemia sp. as first‐feeding fry for 35 d were observed to convert readily to formulated diets. At 79 d posthatch, four formulated feeds were offered: sturgeon starter 9304, Biokyowa, Zeigler esocid diet, and Tunison sturgeon starter. At the end of 60 d, fish fed Biokyowa had the greatest growth and best feed conversion ( P ≤ 0.05). Feed conversions were significantly different between all treatments, indicating wide variability in growth response to the diets tested. Proximate analyses of diets showed Biokyowa highest in protein (59.43%) and dry matter (97.28%).

Progressive Fish-Culturist↗
USGS1995

Protein retention and liver aminotransferase activities in Atlantic salmon fed diets containing different energy sources

Atlantic salmon ( Salmo salar ) fingerlings (14.4 g) were fed diets containing either glucose, dextrin, raw corn starch and lipid, or a high protein U.S. Fish and Wildlife Service open-formula diet (ASD2-30) for 12 weeks. Significant differences in weight gain and feed: gain ratio were not observed among salmon fed the diets containing glucose, dextrin or ASD2-30. Diets containing dextrin and glucose supported greater protein retention and reduction in alanine aminotransferase activity than the other diets. Activity of aspartate aminotransferase was not affected by the dietary treatment. Protein retention correlated highly with alanine aminotransferase activity.

Comparative Biochemistry and Physiology, Part A: P↗
USGS1993

Effects of feeding a high level of D-glucose on liver function juvenile white sturgeon (Acipenser transmontanus)

Juvenile white sturgeon ( Acipenser transmontanus ) were fed three isonitrogenous and isoenergetic diets containing either 35% D-glucose (HC), a mixture of 20% dextrin and 10% cellulose (MC), or 23% cellulose (LC), to investigate the effects of dietary carbohydrate on liver function. After 8-week feeding, body weight gain of fish fed the HC diet was consistently higher than that of fish fed the MC and LC diets, but was not significantly different from the MC-fed fish. Fish fed the HC diet had significantly (p < 0.05) higher feed efficiencies and liver glycogen concentrations than fish fed the MC and LC diets. Sturgeon were injected intravenously with 10 mg kg -1 body weight of sulfobromophthalein (BSP) and post-injection blood taken from the caudal vein at 15, 30, 60, and 120 min. No significant differences in plasma BSP concentrations were found among the treatments at these times. Plasma hemoglobin and activities of aspartate and alanine aminotransferase were not affected by the diets. This study suggests that the HC diet does not adversely affect liver function or weight gain. Inclusion of high dietary levels of digestible and inexpensive carbohydrates in commercial sturgeon feeds seems promising, but long-term feeding trials should be conducted to confirm this assertion.

Fish Physiology and Biochemistry↗