LISTSERV mailing list manager LISTSERV 15.5

Help for FISH-SCI Archives

FISH-SCI Archives

FISH-SCI Archives


Next Message | Previous Message
Next in Topic | Previous in Topic
Next by Same Author | Previous by Same Author
Chronologically | Most Recent First
Proportional Font | Monospaced Font


Join or Leave FISH-SCI
Reply | Post New Message
Search Archives

Subject: Gaidropsarus D1 oscillating wave
From: Richard Lord <[log in to unmask]>
Reply-To:Scientific forum on fish and fisheries <[log in to unmask]>
Date:Thu, 15 Jun 2000 09:39:16 +0100

text/plain (19 lines)

A commercial fisherman brought me a shore rockling, Gaidropsarus mediterraneus, and a three bearded rockling, Gaidropsarus vulgaris, last night for a school class I am teaching.  The Gaidropsarus rocklings, and possibly others, have a low first dorsal fin that constantly oscillates rapidly in a wave along its length.  The first dorsal fin is so low that it is difficult to see so the fin gives the impression that it is a pulsing 'light' travelling down the back of a fish.  Has someone studied this phenomenon? Does this fin serve a useful function for the fish?  Do other subfamilies of fishes also display this characteristic?

The fisherman told me that at certain times of year he noticed that some three bearded rocklings have a bright orange spot on their body. He wonders if this is a sexual character and whether the species can be sexed using this character.

Yours sincerely,
Richard Lord
Guernsey GY1 1BQ
Great Britain

Email:  [log in to unmask]
Tel: +44 (0)1481 700688
Fax: +44 (0)1481 700699

><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>
       To leave the Fish-Sci list, Send blank message to:
        mailto:[log in to unmask]
Vacation? send SET FISH-SCI NOMAIL to [log in to unmask]
><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>

Back to: Top of Message | Previous Page | Main FISH-SCI Page



CataList Email List Search Powered by the LISTSERV Email List Manager