Energetic consequenses of an inducible morphological defence in crucian carp
Crucian carp (Carassius carassius) increases in body depth in response to chemical cues from piscivores and the deeper body constitutes a morphological defence against gape-limited piscivores. In the ®eld, deep-bodied individuals su€er a density-dependent cost when com- peting with shallow-bodied conspeci®cs. Here, we use hydrodynamic theory and swimming respirometry to investigate the proposed me