Summary: Allometric growth of the sulcus in Cynoscion spp.
W. E. AGUIRRE
Department of Ecology and Evolution, State University of New York 650 Life Sciences
Building, Stony Brook, NY 117945245, U.S.A.
(Received 24 April 2003, Accepted 18 August 2003)
The sulcus of Cynoscion spp. exhibited strong positive allometric growth relative to the medial
surface of the otolith, and the ratio between the area of the sulcus and the otolith (S:O)
increased dramatically with size. The S:O ratios of larger specimens are the highest that have
so far been reported. # 2003 The Fisheries Society of the British Isles
Key words: allometry; Cynoscion; otoliths; Sciaenidae; S:O ratio; sulcus.
Recently, the relationship between the area of the sagitta (saccular otolith or
otolith) and the area of the sulcus has received attention because of its potential
influence on fish hearing (Gauldie, 1988; Lombarte, 1992; Arellano et al., 1995;
Aguirre & Lombarte, 1999). The sulcus is a depression on the medial surface of
the otolith that forms where the maculus or sensory tissue comes into contact
with the otolith. The relative size of the sulcus is typically described as a ratio of
the area of the sulcus (S) to the area of the medial surface of the otolith (O), the
S:O ratio (Gauldie, 1988). Gauldie (1988) presented a model according to which
fishes with a relatively large sulcus (as a proxy for the maculus) are more