Sexual differences in spawning behaviour and catchability of plaice (Pleuronectes platessa) west of Iceland

2003 ◽  
Vol 61 (1-3) ◽  
pp. 57-71 ◽  
Author(s):  
Jon Solmundsson ◽  
Hjalti Karlsson ◽  
Jonbjorn Palsson
Author(s):  
G. R. Forster

On the evening of 20 February 1953, two plaice (Pleuronectes platessa L.) in the largest tank of the Aquarium were observed spawning. No information on the spawning behaviour of pleuronectids has been found in the literature; nevertheless, the observation may very well not be original, but is considered of sufficient interest to justify an account of it.


2021 ◽  
Author(s):  
Marco Milella ◽  
Daniel Franklin ◽  
Maria Giovanna Belcastro ◽  
Andrea Cardini

1972 ◽  
Vol 50 (9) ◽  
pp. 1183-1188 ◽  
Author(s):  
M. Chen ◽  
G. Power

In samples taken monthly throughout the year the percentage of American smelt in Lake Ontario and Lake Erie containing cysts of Glugea hertwigi was 5.2% and 62.7% respectively. Sexual differences in incidence were observed, the significance of which was uncertain as results from the two lakes were contradictory.In male fish infection was almost entirely restricted to the digestive tract with few cysts in the liver, skin, and testes. In female fish the digestive tract and ovaries were similarly infected.Seasonal fluctuations in Glugea infection were obvious and seemed correlated with the gonadal cycle. In both sexes the highest parasite load corresponded with the onset of maturation.A striking difference in fecundity between the two smelt populations was attributed to the Glugea infection. In females parasite cysts replaced ovarian tissue, causing a reduction in the number of maturing eggs.


Hypatia ◽  
2009 ◽  
Vol 24 (2) ◽  
pp. 54-76 ◽  
Author(s):  
Kelly Oliver

I challenge the age-old binary opposition between human and animal, not as philosophers sometimes do by claiming that humans are also animals, or that animals are capable of suffering or intelligence, but rather by questioning the very category of “the animal” itself. This category groups a nearly infinite variety of living beings into one concept measured in terms of humans—animals are those creatures that are not human. In addition, I argue that the binary opposition between human and animal is intimately linked to the binary opposition between man and woman. Furthermore, I suggest that thinking through animal differences or differences among various living creatures opens up the possibility of thinking beyond the dualist notion of sexual difference and enables thinking toward a multiplicity of sexual differences.


2012 ◽  
Vol 112 (2) ◽  
pp. 90-96 ◽  
Author(s):  
Andrea Raya Rey ◽  
Klemens Pütz ◽  
Gabriela Scioscia ◽  
Benno Lüthi ◽  
Adrián Schiavini

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