scholarly journals A MICROSPORIDIAN INFECTION OF THE DIGESTIVE TRACT OF THE WINTER FLOUNDER, PSEUDOPLEURONECTES AMERICANUS

1965 ◽  
Vol 129 (2) ◽  
pp. 371-387 ◽  
Author(s):  
HORACE W. STUNKARD ◽  
FRED E. LUX
Keyword(s):  
Digestive Tract ◽  
Winter Flounder ◽  
Pseudopleuronectes Americanus ◽  
Microsporidian Infection

Regulation of Zn2+ Uptake from the Gastrointestinal Tract of a Marine Teleost, the Winter Flounder (Pseudopleuronectes americanus)

1983 ◽  
Vol 40 (S2) ◽  
pp. s197-s205 ◽  
Author(s):  
M. A. Shears ◽  
G. L. Fletcher
Keyword(s):  
Digestive Tract ◽  
The Body ◽  
Winter Flounder ◽  
Marine Teleost ◽  
Absorption Process ◽  
Pseudopleuronectes Americanus ◽  
Intravenous Injections ◽  
Rapid Accumulation ◽  
Gastrointestinal Uptake

The gastrointestinal uptake of Zn2+ was studied in winter flounder (Pseudopleuronectes americanus) using an in situ technique. The entire digestive tract was capable of absorbing Zn2+, with the uppermost portion of the intestine having the highest and the stomach the lowest capacity. A seasonal study revealed that the capacity of the digestive tract to absorb Zn2+ was greatest during the summer months. At least two steps appeared to be involved in the absorption process, the first a rapid accumulation of Zn2+ by the tissue, and the second a slower transfer into the body. The amount of Zn2+ absorbed increased with increasing loads of Zn2+ in the lumen; the transfer mechanism(s) was not saturated at the highest Zn2+ loads tested. Zn2+ uptake was inhibited in the presence of Cu2+, Cd2+, Co2+, Cr2+, Ni2+, Fe3+, Mn2+, and Hg2+. The capacity of the digestive tract to absorb Zn2+ was not affected by feeding the flounder a high-Zn2+ diet or by increasing body Zn2+ loads by intravenous injections. It is suggested that elimination mechanisms may play a greater role in maintaining Zn2+ homeostasis than controlling gastrointestinal uptake.

The Winter Flounder (Pseudopleuronectes americanus) in Long Pond, Conception Bay, Newfoundland

1971 ◽  
Vol 28 (8) ◽  
pp. 1153-1165 ◽  
Author(s):  
V. S. Kennedy ◽  
D. H. Steele
Keyword(s):  
Food Intake ◽  
Growth Rates ◽  
Plant Material ◽  
Early Growth ◽  
Winter Flounder ◽  
Pseudopleuronectes Americanus ◽  
Food Items ◽  
Fish Remains ◽  
Males And Females ◽  
Conception Bay

Monthly samples of winter flounder taken in Long Pond from November 1962 to October 1963 indicated that the flounder moved into deeper water (7–10 m) during the summer and returned to shallow water (1–2 m) from September to June. These movements corresponded to the end of the spawning season and the ripening of the gonads respectively. Spawning occurred from March until early June, most of it in May and early June. Most males were mature at age 6 and most females at age 7. Fifty percent of the males and females were mature at 21 and 25 cm respectively. The growth rates of the males and females were similar until the age of 8, after which the females apparently outgrew the males. Early growth and fecundity were similar to those reported for other areas. No feeding took place in December or January but the flounder fed in March and continued to feed throughout the summer; food intake decreased in the fall. They were omnivorous and the type of food eaten varied with the locality. Polychaetes, plant material, and molluscs were the most common food items throughout the year. Capelin eggs and fish remains were found only during a few months of the year but were eaten in great quantities.

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