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- Calling activity and calls' temporal features inform about fish reproductive condition and spawning in three cultured Sciaenidae speciesPublication . Bolgan, Marta; Crucianelli, A.; Mylonas, C.C.; Henry, S.; Falguière, J.C.; Parmentier, E.; Mollo, ErnestoAlthough many fish species are vocal, the use of fish sounds for aquaculture management and wild population protection has not received much attention. In this study, sound production of three members of the Sciaenidae family was monitored before and during spawning in aquaculture facilities. The species examined include the meagre Argyrosomus regius, the shi dum Umbrina cirrosa and red drum Sciaenops ocellatus. Red drum reproduces spontaneously in captivity, whereas shi drum and meagre often require hormonal stimulation using gonadotropin releasing hormone agonist (GnRHa) for the induction of oocyte maturation, ovulation and spawning. In all three species, a clear increase in calling activity was detected during spawning nights, when longer sounds with a higher number of faster repeated pulses were emitted. Changes of call temporal features could be related to histological changes in the sonic muscles. After GnRHa treatment and during spawning, meagre sonic fibres were wider and the ratio of sarcoplasmic reticulum to myofibril cross-sectional area was higher. The correlation of calling activity with spawning events opens up the possibility of using the monitoring of calling activity and of call temporal features as tools for evaluating the reproductive state of different sciaenid species, both in the wild and captivity.
- Effect of the algal alkaloid caulerpin on neuropeptide Y (NPY) expression in the central nervous system (CNS) of Diplodus sargusPublication . Magliozzi, Laura; Maselli, Valeria; Almada, Frederico José Oliveira de; Di Cosmo, Anna; Mollo, Ernesto; Polese, GianlucaRecent studies have suggested that Mediterranean indigenous fish species are affected by bioactive metabolites coming from marine invasive species via food web interactions. In particular, both physiological and behavioural changes in the white sea bream Diplodus sargus were related to caulerpin (CAU), a bisindolic alkaloid particularly abundant in the invasive alga Caulerpa cylindracea, on which the fish actively feed. Dietary administration of CAU decreased aggressiveness in D. sargus, suggesting an anxiolytic-like effect of CAU possibly mediated by endogenous anxiolytic agents. This hypothesis is supported here by the finding of a significant increase of NPY transcriptional expression in the brain of fish fed with CAU enriched food, shedding more light on the neural mechanisms behind the altered behaviour of D. sargus.