Studies on the Diet, Feeding Mechanism and Alimentary Tract in Two Closely Related Teleosts, the FreshwaterCottus gobioL. and the MarineParenophrys bubalisEuphrasen

Abstract

The diet and feeding mechanism in Cottus gobio and Parenophrys bubalis are described, together with the morphology and histology of the alimentary tract. Both species are sluggish bottom dwelling, carnivorous fish, and are capable of catching and swallowing relatively large prey. The gut is fully differentiated into esophagus, stomach, intestine with pyloric ceca, and rectum. The liver is morphologically separate from the pancreas, and separate bile and pancreatic ducts open into the base of one of the pyloric ceca. The organisation of the gut is well suited to the fishes' mode of life, showing adaptations for taking large meals which may be at irregular intervals.

Effects of salinity and starvation on the alimentary canal anatomy of the rainbow trout Salmo gairdneri Richardson

“…But the initial increase in mucous cell number on entry into fresh water may be comparable with the effect observed in our study of rainbow trout. Western (1969) found, in the intestine, mucous cells were fewer in the marine species Enophrys bubalis than in the closely-related freshwater species Cottus gobio.…”

Ecosystem effects of invasive crayfish increase with crayfish density

“…Therefore, an a priori aggregation approach was used whereby source data (isotopic values) were plotted and similar sources forming clusters were grouped before analysis (Phillips et al, 2014). Potential food sources for bullhead include different families of macroinvertebrates, bullhead eggs, newly-hatched bullhead, and signal crayfish (Copp et al, 1994;Dahl, 1998;Western, 1969). Only different families of macroinvertebrates were considered during modelling as no smaller signal crayfish and bullhead eggs or larvae were recorded from enclosures during Surber sampling.…”

Observations on the pancreas of the marine lizard fish Saurida tumbil (Bloch)

“…Kamal Pasha (1 968) while describing the exocrine pancreas of some teleosts mentioned that in Megalops cyprinoides it invests the pyloric region. Studies by Bullock (1967) and Western (1969) describe the extremely variable nature in the distribution of the pancreas.…”