Laboratory spawning, larval development and metamorphosis of the marine snailNassarius reticulatus(L.) (Caenogastropoda, Nassariidae)

Abstract

The reproduction of Nassarius reticulatus (L.) (Mollusca, Gastropoda, Prosobranchia) was studied in the laboratory, and egg deposition and development through metamorphosis were recorded. Individuals were reared in aquaria to observe the deposition of egg capsules. Animals attached their triangular egg capsules to the glass of a small aquarium. All adult individuals laid several egg capsules in the same area, with the same orientation. Chemoreception may play an important role in the selection of spawning sites for various species of mud snails and our observations confirm this finding for N. reticulatus. Each egg capsule contained 100-120 lecithotrophic embryos, which developed until the veliger stage was reached. The effect of different diets was tested on swimming larvae development. Various phytoplanktonic foods were unsuccessful, as previously observed in other species of gastropods, since the availability of an effective larval food has limited the descriptions of gastropod development in the laboratory. However, a compound food, a liquid suspension for filter-feeder organisms, allowed us to observe complete larval development and metamorphosis in 35 days. All phases of the larval development were observed, along with their morphology (in light microscopy) and ultra-morphology (SEM). Settled juveniles were fed on commercial granulated food and observed over a period of 45 days.

Preliminary investigation on the use of artificial substrates to favor Tritia mutabilis (Linnaeus, 1758) spawning in Central Adriatic Sea: a possible contribution to stock maintenance

“…In particular, they were distinguished from the capsules of Nassarius reticulatus (D'ASARO, 1993;ZUPO & PATTI, 2009) by the presence of complex lateral ridges and spines and by the relatively low number of embryos per capsule. The percentage of available pyramid surface covered with egg capsules was estimated by analyzing the calibrated digital images using the ImageJ software (Research Services Branch, National Institute of Mental Health, Bethesda, Maryland, USA).…”

The performance of gold-mouth turban Turbo chrysostomus larvae in different temperature and salinity media

“…Larvae will enter the shell and spread in the base container (Peck et al, 2016). In the Nassarius reticulates, the feet are enlarged during the larval stadia, and the pigmented propodium appeared on the feet ventral proximal as becoming clearer in the metamorphosis stage (Zupo & Patti, 2009). The veliger larvae still consume yellow-egg (endogenous feeding), therefore the feed provided, namely, Navicula sp.…”

Desove y desarrollo intracapsular del caracol marino Hexaplex nigritus (Neogastropoda: Muricidae) en laboratorio

“…disminuye el tiempo experimental en laboratorio (González & Gallardo, 1999), no permite conocer la etología de los reproductores en cautiverio (Zupo & Patti, 2009) ni su capacidad reproductiva (Jagadis, Shunmugasundaram, Sathakkathulla, & Mohanraj, 2013). En el presente trabajo, el caracol H. nigritus exhibió una rápida adaptación fisiológica a las condiciones del sistema experimental, coincidiendo con las observaciones de trabajos previos con la misma especie (Góngora-Gómez et al, 2011; Camacho-Sánchez, 2012) e, inclusive, aumentando el tiempo de confinamiento a dos años, sin presentar mortalidad.…”