Abstract

DAVID-RUALES, Carlos A. et al. Early-stage allometric relationships of the Brycon moorei Steindachner (Characidae) species, under controlled conditions. Actu Biol [online]. 2020, vol.42, n.113, e1.  Epub May 10, 2021. ISSN 0304-3584.  https://doi.org/10.17533/udea.acbi.v42n113a02.

For Brycon Moorei, morphometry data in early stages of development is non-existent. The objective was to establish the main allometric relationships in the early stages of B. moorei. 12 meristic variables were analyzed in an experimental time ranging from hatching to 15 days post-hatching. In the larval vitelline stage (LV), it was recorded on average: total length (TL) of 4.74 ± 0.05 mm; standard length (EL) of 4.21 ± 0.07 mm; snout length (SnL) 0.3 ± 0.01; eye diameter (ED) 0.37 ± 0.007 mm; head length (HL) 1.02 ± 0.04 mm; head height (HH) 0.88 ± 0.069 mm; body height (BH) 1.26 ± 0.01 mm; snout-pectoral fin length (SnPF) 1.35 ± 0.034; absence of pelvic, anal and dorsal fins and the weight was 1.8 ± 0.2 mg. In juvenile stage (J), the measures were: LT of 25.66 ± 0.64 mm; LE of 21.49 ± 0.63 mm; SnL of 1.69 ± 0.059 mm; 1.71 ± 0.048 mm ED; HL 6.33 ± 0.21 mm; HH of 4.89 ± 0.47 mm; BH of 6.13 ± 0.17 mm; SnPF of 6.48 ± 0.19 mm; SnPeF of 10.83 ± 0.28 mm; SnDF of 11.16 ± 0.33 mm; Sn-AF of 3.68 ± 0.34 mm; the weight was 221.6 ± 15.84 mg. For the LV, the number of pre-anal myomers was 28.65 ± 4.7; the post-anal was 23.85 ± 4.27, with a total of 52.47 ± 8.34; for J the myomers were not visible. This information is essential for ecological and productive purposes in B. moorei.

Keywords : allometry; larvae; ontogeny.

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