Ontogenetic shift in the energy allocation strategy and physiological condition of larval plaice (Pleuronectes platessa)

English version

Autoři: Julien Di Pane ^aff001; Léa Joly ^aff001; Philippe Koubbi ^aff002; Carolina Giraldo ^aff001; Sébastien Monchy ^aff003; Eric Tavernier ^aff003; Paul Marchal ^aff001; Christophe Loots ^aff001
Působiště autorů: IFREMER, Channel and North Sea Fisheries Research Unit, Boulogne-sur-Mer, France ^aff001; UFR 918 « Terre, Environnement, Biodiversité », Sorbonne Université, Paris, France ^aff002; LOG—Laboratoire d’Océanologie et Géosciences, Wimereux, France ^aff003
Vyšlo v časopise: PLoS ONE 14(9)
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pone.0222261

Souhrn

Condition indices aim to evaluate the physiological status of fish larvae by estimating both the level of starvation and potential of survival. Histological indices reveal direct effects of starvation whereas biochemical indices such as lipid classes or RNA:DNA ratios are used as proxies of condition, giving information on the amount of energy reserves and growth rate, respectively. We combined these three indices to evaluate ontogenetic variations of growth performance, lipid dynamics and nutritional condition of plaice larvae caught in the field during winter 2017 in the eastern English Channel and the Southern Bight of the North Sea. RNA:DNA ratios showed that larvae at the beginning of metamorphosis (stage 4) had a lower growth rate than younger individuals (stages 2 and 3). A significant increase in the proportion of triglycerides also occurred at stage 4, indicating energy storage. Histological indices indicated that most of the larvae were in good condition, even younger ones with low lipid reserves. There was, however, an increase in the proportion of healthy individuals over ontogeny, especially with respect to liver vacuoles which were larger and more numerous for stage 4 larvae. Combined together, these condition indices revealed the ontogenetic shift in the energy allocation strategy of plaice larvae. Young larvae (stages 2 and 3) primarily allocate energy towards somatic growth. The decrease in growth performance for stage 4 was not related to poor condition, but linked to a higher proportion of energy stored as lipids. Since the quantity of lipid reserves is particularly important for plaice larvae to withstand starvation during metamorphosis, this could be considered as a second critical period after the one of exogenous feeding for larval survival and recruitment success.

Klíčová slova:

Biology and life sciences – Developmental biology – Life cycles – Larvae – Metamorphosis – Fish metamorphosis – Cell biology – Cellular structures and organelles – Vacuoles – Anatomy – Histology – Biochemistry – Lipids – Zoology – Fish biology – Fish physiology – Animal physiology – Vertebrate physiology – Nutrition – Malnutrition – Starvation – Medicine and health sciences

Zdroje

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Ontogenetic shift in the energy allocation strategy and physiological condition of larval plaice (Pleuronectes platessa)

Souhrn

Klíčová slova:

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