Effects of feeding condition on the morphology, behaviour and nutritional status of Prochilodus lineatus early larvae during downstream drift: a laboratory experiment approach
Sabina Llamazares Vegh A B H , Ismael E. Lozano C , Marina V. Diaz D E , María I. Gómez F , Sebastián Sánchez G and Carlos M. Fuentes F HA Facultad de Ciencias Veterinarias, Universidad de Buenos Aires, Avenida Chorroarín 280, C1427CWO, Buenos Aires, Argentina.
B Instituto de Investigaciones en Producción Animal, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)–Universidad de Buenos Aires, Avenida Chorroarín 280, C1427CWO, Buenos Aires, Argentina.
C CONICET–Universidad de Buenos Aires, Instituto de Biodiversidad y Biología Experimental Aplicada, Ciudad Universitaria, Intendente Güiraldes 2160, Ciudad Autónoma de Buenos Aires C1428EGA, Buenos Aires, Argentina.
D CONICET, Instituto de Investigaciones Marinas y Costeras, Rodríguez Peña 4002-4100, B7602GSD, Mar del Plata, Buenos Aires, Argentina.
E Instituto Nacional de Investigación y Desarrollo Pesquero, Paseo Victoria Ocampo 1, Escollera Norte, B7602HSA, Mar del Plata, Buenos Aires, Argentina.
F Dirección de Planificación y Gestión de Pesquerías. Ministerio de Agricultura, Ganadería y Pesca, Avenida Paseo Colón 982, C1063ACJ, Ciudad Autónoma de Buenos Aires, Argentina.
G Facultad de Ciencias Veterinarias, Instituto de Ictiología del Nordeste, Universidad Nacional del Nordeste, Sargento Cabral 2139, 3400, Corrientes, Argentina.
H Corresponding authors. Email: sabinallamazares@gmail.com; carlosmarianofuentes@gmail.com
Marine and Freshwater Research 72(9) 1329-1339 https://doi.org/10.1071/MF20203
Submitted: 28 June 2020 Accepted: 28 February 2021 Published: 13 April 2021
Abstract
Early life stages of migratory fish in rivers rely on physical transport mechanisms to carry them from spawning sites to distant nursery areas where they find food and refuge conditions. Starvation after a prolonged downriver drift could severely affect the colonisation and predator evasion capabilities of the larvae. In this study we investigated differences in the external morphology, nutritional condition and swimming abilities of fed and unfed Prochilodus lineatus early larvae under experimental conditions. After yolk reabsorption on Day 6, larvae were either fed with nauplii of Artemia salina or left unfed for up to 10 days. Larvae from each feeding regime (i.e. fed and unfed) were sampled daily from three aquaria, and the morphometry and routine swimming activity were determined and analysed together with a previously published RNA/DNA ratio dataset. The results were in agreement with previous investigations that indicated that the larvae of this species have starvation endurance; however, prolonged food deprivation is associated with a smaller body, anal depth and head length, as well as lower RNA/DNA ratios and reduced swimming ability.
Keywords: larval biology, fish, dispersal, freshwater, flood plains, ecohydrology, recruitment.
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