Shrinkage of Prochilodus lineatus (Valenciennes, 1847) larvae preserved in either ethyl‐alcohol or formalin in relation to their developmental stage and feeding condition |
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| Authors: | M I Gómez S Sánchez C M Fuentes |
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| Affiliation: | 1. Dirección de Pesca Continental, Ministerio de Agricultura, Ganadería y Pesca, , Buenos Aires, Argentina;2. Facultad de Ciencias Veterinarias, Instituto de Ictiología del Nordeste, Universidad Nacional del Nordeste, , Corrientes, Argentina |
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| Abstract: | The effects of preservation in 95% ethyl‐alcohol and 5% formalin were analysed for 3 months on standard length of Prochilodus lineatus larvae from hatching to the end of the flexion process. Unyolked stages were raised under two feeding regimes: unfed and daily fed. All developmental stages that were preserved in formalin as well as the yolked and flexion‐postflexion larvae stored in alcohol shrank significantly (2–6%). In contrast, unyolked preflexion larvae showed a slight but significant enlargement after storage in alcohol (1%). Shrinkage of preflexion stages was 2.5% higher when stored in formalin, while both preservative agents caused similar shrinkage in flexion‐postflexion larvae (ca. 3%). Shrinkage levels after storage in alcohol were dependent on live length, decreasing or increasing with increasing length in yolked and flexion‐postflexion larvae, respectively. The feeding regime did not affect length changes after preservation in either preservative agent. |
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