Notes on some fishes associated with the Antarctic krill. III. Antopterus pharao ZUGMAYER (Family Anotopteridae)

Morphological and ecological studies are given for a total of twelve specimens of Anotopterus pharao ZUGMAYER caught along with the Antarctic krill. Among over fifty fish species recorded as a by-catch in krill fisheries in the Antarctic Ocean, A. pharao is known as one of the rarest species and its...

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Bibliographic Details
Main Authors: Tetsuo Iwami, Masanori Takahashi
Format: Report
Language:English
Published: Laboratory of Biology, Tokyo Kasei Gakuin University/ Japan Marine Fishery Resource Research Center 1992
Subjects:
Antarctic
The Antarctic
Scotia Sea
Pacific
Antarctic Ocean
Antarc*
Antarctic Krill
North Atlantic
Polar Biology
Proceedings of the NIPR Symposium on Polar Biology
Online Access:https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=5156
http://id.nii.ac.jp/1291/00005156/
https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=5156&item_no=1&attribute_id=18&file_no=1
Description
Summary:Morphological and ecological studies are given for a total of twelve specimens of Anotopterus pharao ZUGMAYER caught along with the Antarctic krill. Among over fifty fish species recorded as a by-catch in krill fisheries in the Antarctic Ocean, A. pharao is known as one of the rarest species and its ecology and biology are still obscure. Morphometric and meristic data, except for the number of vertebrae, of the present specimens mostly agree with those of fishes collected from the Northern Hemisphere. A. pharao from the Antarctic waters has greater number of vertebrae (usually more than 83) than those from the North Atlantic and North Pacific (usually less than 81). The condition of hermaphroditism is histologically confirmed for the first time. All specimens histologically examined are not fully matured. Developmental stage of oocytes varies among individuals even of nearly the same size. Stomachs are mostly vacant in nine specimens, and those of the other three contain the Antarctic krill. One of the three also contains one specimen of Notolepis coatsi DOLLO of partly digested. The distribution pattern of the Antarctic A. pharao seems to be circumpolar. A. pharao is found in more than 10% of the net hauls of the Antarctic krill fisheries in the Scotia Sea region.

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