@article {475,
	title = {The anal fin complex in a weakly discharging electric fish, Gnathonemus petersii(Mormyridae)},
	journal = {Journal of Fish Biology},
	volume = {66},
	year = {2005},
	month = {Jan-01-2005},
	pages = {266 - 275},
	abstract = {<p>An examination of the permanent bony structures of the anal fin complex in the mormyrid fish, <em>Gnathonemus petersii</em>, revealed two new structural sexual dimorphisms: longer proximal pterygiophores and wider anal fin rays in males than in females. Both structures are thought to facilitate the male\&rsquo;s courtship-associated anal fin reflex. Adult male mormyrid fishes are characterized by a dorsally directed indentation of the posterior body wall (anal fin indentation). The expression of this indentation in males, presumably driven by anal fin musculature, was correlated with the fish\&rsquo;s gonadal state: large indentations were associated with high gonado-somatic indices and small indentations with low indices.</p>
},
	issn = {0022-1112},
	doi = {10.1111/jfb.2005.66.issue-110.1111/j.0022-1112.2005.00608.x},
	url = {http://www.blackwell-synergy.com/toc/jfb/66/1},
	author = {Greisman, L. and Moller, P.}
}
