Development of free neuromasts in Engraulis ringens and Strangomera bentincki (Teleostei Clupeiformes) early larvae

Alejandra Llanos-Rivera


DOI: https://doi.org/10.3856/vol42-issue1-fulltext-22

Abstract


Neuromast morphology and distribution are characterized during early ontogeny of anchoveta (Engraulis ringens) and common sardine (Strangomera bentincki). Although both species share morphological features, they show several differences during their early ontogeny as size at hatching and yolk absorption.  Larvae were obtained from incubation (at 12°C) of planktonic eggs, collected during the spawning season 2001 (August – September) at Coliumo Bay.  The neuromasts were observed from hatching to 25 days and the pattern of neuromast appearance in newly hatched larva until yolk absorption was determined using Janus Green staining and scanning electronic microscope. The results show a similar pattern of neuromast development in both species. At hatching, 2 pairs of neuromasts are observed in the cephalic area and 8-9 in the rest of the body, which increase to 19 pairs and to 30-39 pairs at a larval size of 11mm, respectively. An average of 12 hair cells per neuromast were counted, with little variation among neuromasts. The polarity of these hair cells was closest to multiple polarity. Neuromast positioning for both species anchoveta and common sardine larvae are similar to those of Engraulis mordax and Clupea harengus, respectively. The similar development pattern of these species seems to be related to similar functional constraints and close taxonomic affinity.


Llanos-Rivera A. Development of free neuromasts in Engraulis ringens and Strangomera bentincki (Teleostei Clupeiformes) early larvae. Lat. Am. J. Aquat. Res.. 2017;42(1). Available from: doi:10.3856/vol42-issue1-fulltext-22 [Accessed 20 Jan. 2019].
Llanos-Rivera, A. (2017). Development of free neuromasts in Engraulis ringens and Strangomera bentincki (Teleostei Clupeiformes) early larvae. Latin American Journal of Aquatic Research, 42(1). doi:http://dx.doi.org/10.3856/vol42-issue1-fulltext-22