碩士 / 國立中山大學 / 海洋生物研究所 / 84 / Sciaenids produce sound in the spawning season. By recording
the underwater sound of red drum (Sciaenops ocellatus,
Sciaenidae) and measuring some physical environmental factors,
the relationship between the environmental factors and sound
periodicity was studied. Results indicate that higher water
temperature and pH value correlated with decrease in, there
were less sound production. Red drums almost only continue
produced sounds from 19:00 to 22:00 during September and
December and this interval matched the spawning period of the
day. These sounds may be more connective to reproduction
because of this match. Male red drum did not produce any sound
when it was in the pond alone or with one female. When four
males were kept together, they produced sounds. It is clear
that the other males can affect a male to produce sounds and
this fact may help to understand the function of sounds. The
target of the sounds may be the males, not the females. But
this inference needs more studies to be proved. The sound
producing system of Sciaenidae is consisted mainly of extrinsic
sonic muscle and swimbladder. Because female red drum do not
have the sonic muscle, the sonic muscle of young red drum
appeared when they were three months old and they were male.
Young male red drum started to produce audiable sound at seven
months old. The weights of sonic muscles and swimbladders
increased with body weights. The male`s swimbladders increased
faster than weight the than females. Morphology of the
sciaenids can be grouped to two types. Type I including red
drum: the ratio of sonic muscle and body weights is smaller,
and the sonic
| Identifer | oai:union.ndltd.org:TW/084NSYSU270005 |
| Date | January 1996 |
| Creators | Tsai,MungPei, 蔡孟蓓 |
| Contributors | Mok,HinKiu;Su,MaoSen, 莫顯蕎,蘇茂森 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 42 |
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