The Anatomy of the Oesophagus, Stomach and Intestine in Common Wolffish (Anarhichas lupus L.): A Basis for Diagnostic Work and Research
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The alimentary canal of laboratory-reared common wolffish (Anarhichas lupus L.) was studied using light and electron microscopy. In the oesophagus, a simple columnar microvillous epithelium with transport characteristics was observed in addition to the main striated squamous epithelium. An osmoregulatory function is proposed for the simple columnar epithelium, which was supported by wide, thin-walled vessels. In the stomach, a separate type of neck cells was observed leading into the acinar gastric glands, which morphologically consist of one cell type: chief cells. The intestine was divided into a proximal and distal segment by an intestinal valve. Pyloric caeca were not present. We propose that shallow, crypt-like structures in the intestinal mucosa are the sites of epithelial-cell proliferation in juveniles and adults. The length of microvilli decreased from approximately 4 microns in the cranial part of the proximal intestine, to 1.5 microns in the distal intestine. In the distal intestine, rod-shaped bacteria were observed between microvilli. An extensive system of thin-walled vessels was observed in the submucosa of juvenile and adult wolffish stomach and intestine. Eosinophilic granular cells were numerous in the perivascular connective tissue in the gastric and intestinal submucosa of adults and juveniles, but were not observed in larvae.
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More PAS-positive granules were found in the distal intestine in the apical cytoplasm of epithelial cells, consistent with pinocytotic vacuoles believed to be involved in protein absorption.
“More periodic acid–Schiff (PAS)‐positive granules were found in the distal intestine in the apical cytoplasm of epithelial cells, which is consistent with pinocytotic vacuoles believed to be involved in protein absorption (Hellberg & Bjerkås, 2000).”
From Insights into thermal sensitivity: Effects of elevated temperature on growth, metabolic rate, and stress responses in Atlantic wolffish (<i>Anarhichas lupus</i>) (2025) · cites this paper as Hellberg & Bjerkås, 2000
Hellberg and Bjerkås (2000) observed major morphological differences between the anterior and posterior intestine of Atlantic wolffish.
“Hellberg and Bjerkås (2000) observed major morphological differences between the anterior and posterior intestine of Atlantic wolffish.”
From Insights into thermal sensitivity: Effects of elevated temperature on growth, metabolic rate, and stress responses in Atlantic wolffish (<i>Anarhichas lupus</i>) (2025) · cites this paper as Hellberg & Bjerkås, 2000
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- Authors
- Hellberg, H., & Bjerkås, I.
- Affiliations
- Norwegian University of Life Sciences (NO)
- Corresponding author
- Hellberg, H.
- ORCID
- Hellberg, H.
- Venue
- Acta Veterinaria Scandinavica
- Published
- 2000-09
- Volume
- 41
- Issue
- 3
- Pages
- 283-297
- ISSN
- 0044-605X (ISSN-L)
- 1751-0147
- PMC
- PMC7996408
- OpenAlex
- W187868141
- Cited by
- 37
- References
- 50
- Citations by year
- 2025: 1 · 2024: 1 · 2023: 2 · 2022: 2 · 2021: 1 · 2020: 3 · 2019: 1 · 2017: 1 · 2016: 5 · 2015: 3 · 2014: 3 · 2013: 2
- FWCI
- 1.27
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Acta veterinaria Scandinavica (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Urology › Comparative Animal Anatomy Studies
- Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Aquaculture Nutrition and Growth
- Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Fish Biology and Ecology Studies
- Keywords
- Anarhichas lupus, esophagus, stomach, intestine, columnar epithelium, chief cells, gastric glands, pyloric caeca, intestinal crypts, epithelial cell proliferation, microvilli, intestinal bacteria, thin-walled vessels, eosinophilic granular cells, osmoregulation, fish histology
- MeSH terms
- Animals, Esophagus, Intestines, Microscopy, Electron, Microscopy, Polarization, Perciformes, Stomach
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