Visual Sufficiency in food detection and initiation of feeding behaviour in the Antarctic fish Trematomus newnesi Boulenger
In order to improve the understanding of food detection mechanisms in the Antarctic nototheniid fish Trematomus newnesi BOULENGER, visual stimulation was tested. During the Antarctic summer of 1997/98,42 individuals, 21 belonging to each of two size classes, were obtained in Admiralty Bay (King Geor...
Main Authors: | , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
National Institute of Polar Research
1999
|
Subjects: | |
Online Access: | https://doi.org/10.15094/00009080 https://doaj.org/article/412181eadb10469086780f9c45ff7000 |
id |
fttriple:oai:gotriple.eu:oai:doaj.org/article:412181eadb10469086780f9c45ff7000 |
---|---|
record_format |
openpolar |
spelling |
fttriple:oai:gotriple.eu:oai:doaj.org/article:412181eadb10469086780f9c45ff7000 2023-05-15T14:03:53+02:00 Visual Sufficiency in food detection and initiation of feeding behaviour in the Antarctic fish Trematomus newnesi Boulenger Edith Fanta Lucelia Donatti Sandra Freiberger 1999-07-01 https://doi.org/10.15094/00009080 https://doaj.org/article/412181eadb10469086780f9c45ff7000 en other eng National Institute of Polar Research doi:10.15094/00009080 0085-7289 2432-079X https://doaj.org/article/412181eadb10469086780f9c45ff7000 undefined Antarctic Record, Vol 43, Iss 2, Pp 221-236 (1999) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 1999 fttriple https://doi.org/10.15094/00009080 2023-01-22T17:53:16Z In order to improve the understanding of food detection mechanisms in the Antarctic nototheniid fish Trematomus newnesi BOULENGER, visual stimulation was tested. During the Antarctic summer of 1997/98,42 individuals, 21 belonging to each of two size classes, were obtained in Admiralty Bay (King George Island, South Shetlands). Fish tests were undertaken in aquaria maintained under controlled environmental conditions and a photoperiod of 22 hours light and 2 hours darkness. For the evaluation of visual stimulation, two species of amphipods, Gondogeneia antarctica and Waldeckia obesa, and the krill Euphausia superba, were offered as prey inside a transparent container in each aquarium. No contact was established between the water with prey and the water with predators, to avoid chemical stimulation. In each test 42.3% of the individuals reacted to the stimulation. Amphipods were detected from a distance of 18cm and krill from 22.5cm. The time lapse between food offer and the first reaction after visual stimulation was 17.7s and the stimulation lasted for 51.5% of the experimental time (30 min). During 30min of observation a mean of 20.9 attacks and 9.0 persecutions were performed against amphipods and 28.3 attacks and 12.6 persecutions against krill. The highest values were always obtained within the first 10 min of the test. The duration of the state of stimulation was significantly higher in the first half of the daylight period. A sequence of attitudes that result from positive visual stimulation was defined. The retina of T. newnesi is a complex matrix with neurones and four types of photoreceptors cells allowing accurate vision, which is an important tool for food detection, being sufficient to elicit feeding behaviour even in the absence of chemical and mechanical stimulation. Article in Journal/Newspaper Antarc* Antarctic Antarctica Euphausia superba King George Island Unknown Admiralty Bay Antarctic King George Island The Antarctic |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
envir geo |
spellingShingle |
envir geo Edith Fanta Lucelia Donatti Sandra Freiberger Visual Sufficiency in food detection and initiation of feeding behaviour in the Antarctic fish Trematomus newnesi Boulenger |
topic_facet |
envir geo |
description |
In order to improve the understanding of food detection mechanisms in the Antarctic nototheniid fish Trematomus newnesi BOULENGER, visual stimulation was tested. During the Antarctic summer of 1997/98,42 individuals, 21 belonging to each of two size classes, were obtained in Admiralty Bay (King George Island, South Shetlands). Fish tests were undertaken in aquaria maintained under controlled environmental conditions and a photoperiod of 22 hours light and 2 hours darkness. For the evaluation of visual stimulation, two species of amphipods, Gondogeneia antarctica and Waldeckia obesa, and the krill Euphausia superba, were offered as prey inside a transparent container in each aquarium. No contact was established between the water with prey and the water with predators, to avoid chemical stimulation. In each test 42.3% of the individuals reacted to the stimulation. Amphipods were detected from a distance of 18cm and krill from 22.5cm. The time lapse between food offer and the first reaction after visual stimulation was 17.7s and the stimulation lasted for 51.5% of the experimental time (30 min). During 30min of observation a mean of 20.9 attacks and 9.0 persecutions were performed against amphipods and 28.3 attacks and 12.6 persecutions against krill. The highest values were always obtained within the first 10 min of the test. The duration of the state of stimulation was significantly higher in the first half of the daylight period. A sequence of attitudes that result from positive visual stimulation was defined. The retina of T. newnesi is a complex matrix with neurones and four types of photoreceptors cells allowing accurate vision, which is an important tool for food detection, being sufficient to elicit feeding behaviour even in the absence of chemical and mechanical stimulation. |
format |
Article in Journal/Newspaper |
author |
Edith Fanta Lucelia Donatti Sandra Freiberger |
author_facet |
Edith Fanta Lucelia Donatti Sandra Freiberger |
author_sort |
Edith Fanta |
title |
Visual Sufficiency in food detection and initiation of feeding behaviour in the Antarctic fish Trematomus newnesi Boulenger |
title_short |
Visual Sufficiency in food detection and initiation of feeding behaviour in the Antarctic fish Trematomus newnesi Boulenger |
title_full |
Visual Sufficiency in food detection and initiation of feeding behaviour in the Antarctic fish Trematomus newnesi Boulenger |
title_fullStr |
Visual Sufficiency in food detection and initiation of feeding behaviour in the Antarctic fish Trematomus newnesi Boulenger |
title_full_unstemmed |
Visual Sufficiency in food detection and initiation of feeding behaviour in the Antarctic fish Trematomus newnesi Boulenger |
title_sort |
visual sufficiency in food detection and initiation of feeding behaviour in the antarctic fish trematomus newnesi boulenger |
publisher |
National Institute of Polar Research |
publishDate |
1999 |
url |
https://doi.org/10.15094/00009080 https://doaj.org/article/412181eadb10469086780f9c45ff7000 |
geographic |
Admiralty Bay Antarctic King George Island The Antarctic |
geographic_facet |
Admiralty Bay Antarctic King George Island The Antarctic |
genre |
Antarc* Antarctic Antarctica Euphausia superba King George Island |
genre_facet |
Antarc* Antarctic Antarctica Euphausia superba King George Island |
op_source |
Antarctic Record, Vol 43, Iss 2, Pp 221-236 (1999) |
op_relation |
doi:10.15094/00009080 0085-7289 2432-079X https://doaj.org/article/412181eadb10469086780f9c45ff7000 |
op_rights |
undefined |
op_doi |
https://doi.org/10.15094/00009080 |
_version_ |
1766274747457339392 |