Monoaminergic substances in the teleost brain: Catecholamine levels in male and female winter flounder,Pseudopleuronectes americanus Walbaum, associated with gonadal recrudescence

1989 ◽  
Vol 7 (1-6) ◽  
pp. 95-100 ◽  
Author(s):  
Laurence W. Crim ◽  
Donna M. Evans ◽  
Kay Moreland
Keyword(s):  
Winter Flounder ◽  
Pseudopleuronectes Americanus ◽  
Male And Female ◽  
Teleost Brain ◽  
Gonadal Recrudescence ◽  
Catecholamine Levels

Seasonal dynamics of Cu2+, Zn2+, Ca2+, and Mg2+ in gonads and liver of winter flounder (Pseudopleuronectes americanus): evidence for summer storage of Zn2+ for winter gonad development in females

1978 ◽  
Vol 56 (2) ◽  
pp. 284-290 ◽  
Author(s):  
G. L. Fletcher ◽  
M. J. King
Keyword(s):  
Seasonal Dynamics ◽  
Seasonal Changes ◽  
Gonad Development ◽  
Winter Flounder ◽  
Feeding Period ◽  
Pseudopleuronectes Americanus ◽  
Male And Female ◽  
Ovary Weight ◽  
Ovarian Growth ◽  
Sexually Mature

The concentrations and total amounts of Zn2+, Cu2+, Mg2+, and Ca2+ were measured in the gonads and livers of sexually mature winter flounder caught at approximately monthly intervals in Chapel's Cove, Newfoundland.The winter flounder fed from April through to October each year. Male and female gonads initiated development in August and spawned in June. The maximum testes weight was observed in October corresponding to the end of the feeding period. The maximum ovary weight was not observed until February, indicating that considerable ovarian growth occurred after feeding had stopped.All four metals in the gonads and livers exhibited seasonal changes. The ovaries accumulated four to six times more Zn2+, Cu2+, and Ca2+ than did the testes. The testes accumulated more Mg2+ than did the ovaries during annual development. The ovaries continued to incorporate all four metals after the fish had stopped eating. Some of the ovaries postfeeding requirements for Zn2+ and Cu2+ could have been met by utilizing liver stores. However, most of the ovaries requirements for Zn2+ must have been obtained from other storage areas in the fish. The ovaries postfeeding requirements for Cu2+, Ca2+, and Mg2+ could have been obtained by the flounder absorbing these metals from the seawater.

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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