Parental fish change their cannibalistic behaviour in response to the cost-to-benefit ratio of parental care

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Sneaking from a female perspective (2007, background): “Similarly, simulated intrusions by sneaking males led to an increase in filial cannibalism and decrease in parental effort by guarder male scissortail sergeant, Abudefduf sexfasciatus (Manica 2004).”
Ventilation or nest defense—parental care trade-offs in a fish with male care (2006, background): “Three studies on parental care and filial cannibalism, one on common gobies and two on bluegill sunfish, all showed that small clutches were completely eaten more often than larger ones, regardless of parental body condition (Kvarnemo et al. 1998; Neff 2003; Manica 2004).”