Skip to main content

Free Content Scaling and Sex-Related Differences in Toadfish (Opsanus Beta) Sonic Muscle Enzyme Activities

Download Article:
 Download
(PDF 523.7470703125 kb)
 
Male toadfishes (genus Opsanus) use a sonic muscle on the swimbladder to produce a mating call — the boatwhistle — for extended periods during the mating season. Previously, we noted significant differences in sonic muscle mass and activities of metabolic enzymes of the sonic muscles between male and female gulf toadfish, Opsanus beta, of a limited size range (12-130 grams). Notably, males had larger sonic muscles and elevated aerobic capacity, as indicated by higher mass-specific activities of citrate synthase (CS) and malate dehydrogenase (MDH). The present study examined the patterns of sonic muscle mass and activities of these enzymes (and lactate dehydrogenase) in sonic muscle and skeletal muscle as a function of a larger range of body size (7–400 grams) in an effort to determine the point of growth and development that these mate-female differences occur, and to shed light on the possible functional significances of these differences. Sonic muscle mass differences were apparent in the smallest toadfish, and identical rates of increase in sonic muscle mass in males and females maintained these differences throughout the size range examined. In contrast, mass-specific CS and MDH activities were similar in smaller toadfish and began to diverge when fish were about 25 g. While mass-specific MDH activity increased at different rates in males and females, mass-specific CS activity increased in males and decreased in females. The results are discussed in the context of possible control by steroid sex hormones, size at sexual maturity, and success in mate attraction.

18 References.

No Supplementary Data.
No Data/Media
No Metrics

Document Type: Research Article

Publication date: 1989-07-01

More about this publication?
  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Terms & Conditions
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more