Effects of stocking density on reared Siberian sturgeon (Acipenser baerii) larval growth, muscle development and fatty acids composition in a recirculating aquaculture system

This study evaluated the effects of rearing density on muscle growth and development in Siberian sturgeon (Acipenser baerii) larvae. Three different stocking densities were tested: low (LD, 30 larvae/l), mid (MD, 80 larvae/l) and high (HD, 150 larvae/l) in a recirculating aquaculture system. Larvae...

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Bibliographic Details
Published in:Aquaculture Research
Main Authors: Aidos, Lucia, Vasconi, Mauro, Abbate, Francesco, Valente, Luisa M. P., Lanfranchi, Marco, Di Giancamillo, Alessia
Other Authors: L. Aido, M. Vasconi, F. Abbate, L.M.P. Valente, M. Lanfranchi, A. Di Giancamillo
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2019
Subjects:
density
fatty acid
larvae
muscle structure
Siberian sturgeon
Settore VET/01 - Anatomia degli Animali Domestici
Settore AGR/19 - Zootecnica Speciale
Acipenser baerii
Online Access:https://hdl.handle.net/2434/609035
https://doi.org/10.1111/are.13936
Description
Summary:This study evaluated the effects of rearing density on muscle growth and development in Siberian sturgeon (Acipenser baerii) larvae. Three different stocking densities were tested: low (LD, 30 larvae/l), mid (MD, 80 larvae/l) and high (HD, 150 larvae/l) in a recirculating aquaculture system. Larvae were sampled at hatching (T0), schooling (T1) and complete yolk-sac absorption (T2) stage and were weighed and processed for muscle tissue histometrical analyses and for qualitative morphological study analyses; fatty acid profile was also determined by Gas Chromatography—Flame Ionization Detector analysis. Low-density larvae presented a higher weight than MD or HD at T2 (p < 0.05). Histometrical analysis revealed that total muscle area was similar at T1 and T2, but higher than T0, while it was lower at HD at schooling (p < 0.05). The fatty acid profile revealed no differences between densities while, during development, there was a selective consumption: sparing or increasing of essential fatty acids to the detriment of their precursors. Our study suggests that lower densities appear to be more suitable to rear Siberian sturgeon in this particular stage of development. Indeed, larvae reared at the lower density were heavier and longer while larvae reared at the higher density showed lower muscle proliferation rate. As a consequence, LD larvae may exert an increase of potential growth at a mid-long term.

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