franja-sup-Home franja-sup-UV

EspañolEnglish

Rev. biol. mar. oceanogr. 50(3): 563-574

Article


Spatial and temporal variations of coastal fish larvae, ectoparasites and oceanographic conditions off central Chile

Mauricio F. Landaeta1, Francisca Zavala-Muñoz1, Pámela Palacios-Fuentes1,2, Claudia A. Bustos1, Mónica Alvarado-Niño3,4, Jaime Letelier3, Mario A. Cáceres5 and Gabriela Muñoz6

1Laboratorio de Ictioplancton (LABITI), Facultad de Ciencias del Mar y de Recursos Naturales, Universidad de Valparaíso, Avenida Borgoño 16344, Reñaca, Viña del Mar, Chile
2Programa de Doctorado en Ciencias Biológicas mención Ecología, Pontificia Universidad Católica de Chile, Avenida Portugal 49, Santiago de Chile, Chile
3Laboratorio de Oceanografía Física y Satelital (LOFISAT), Facultad de Ciencias del Mar y de Recursos Naturales, Universidad de Valparaíso, Avenida Borgoño 16344, Reñaca, Viña del Mar, Chile
4Programa de Magíster en Oceanografía, Universidad de Valparaíso, Facultad de Ciencias del Mar y de Recursos Naturales, Universidad de Valparaíso, Avenida Borgoño 16344, Reñaca, Viña del Mar, Chile
5Facultad de Ciencias del Mar y de Recursos Naturales, Universidad de Valparaíso, Avenida Borgoño 16344, Reñaca, Viña del Mar, Chile
6Laboratorio de Parasitología Marina, Facultad de Ciencias del Mar y de Recursos Naturales, Universidad de Valparaíso, Avenida Borgoño 16344, Reñaca, Viña del Mar, Chile

 emailButton mauricio.landaeta@uv.cl

 

The objective of this study is to determine the temporal variation of oceanographic conditions, ichthyoplankton and their ectoparasites in nearshore marine waters. From October 11th 2012 to June 5th 2014, 30 ichthyoplankton surveys were carried out along a cross-shelf transect from 0.25 km of the coastline to 4.50 km offshore off Montemar, Bahía Valparaíso, central Chile. We identified a total of 5,553 fish larvae, belonging to 37 taxa. The most abundant fish larvae with pelagic spawning were the common sardine Strangomera bentincki (relative abundance= 26.39%), the anchoveta Engraulis ringens (8.94%), and the lanternfish Hygophum bruuni (7.72%); whereas the most abundant species with benthic brooding were the blennies Scartichthys viridis (15.77%), Hypsoblennius sordidus (8.27%) and the clingfish Gobiesox marmoratus (7.06%). The most parasitized fish larvae were from benthic brooding origin, namely the clingfishes G. marmoratus (prevalence= 9.63%) and Sicyases sanguineus (0.54%), the kelpfish Auchenionchus variolosus (1.72%), and triplefin blenny Helcogrammoides cunninghami (3.28%). Only one species from pelagic spawning origin, the sandperch Prolatilus jugularis (0.57%), had ectoparasites. The abundance of some larval fish species with ectoparasite decreased with distance to the shore; S. bentincki, H. bruuni (pelagic spawning) or S. viridis (benthic brooding) were found to be more abundant at 2.0 km offshore. The ectoparasites were identified as Trifur spp. (Copepoda: Pennellidae) and Caligus spp. (Copepoda: Caligidae), with pennellids being the most frequent (1 to 3 parasites per larva). Ninety-four and 88% of pennellids and caligids, respectively, were collected in the nearshore station. During periods of high ectoparasite prevalence on fish larvae, seawater was vertically stratified with a cross-shelf deepening (late autumn) or shoaling (summer) of the pycnocline from offshore to nearshore. The results suggest that fish larvae with BB were more frequently parasitized and that physical conditions of the water column may contribute both to coastal retention of fish larvae as well as ectoparasite infestation in nearshore waters.

Key words:  Trifur sp., Caligus sp., clingfish, horizontal density gradients, central Chile, South America

pdficon-rbmo

 
atasehir evden eve nakliyat avcilar evden eve nakliyat umraniye evden eve nakliyat beylikduzu evden eve nakliyat sisli evden eve nakliyat bahcelievler evden eve nakliyat