Cranial osteological development and abnormalities in northern palm ruff,Seriolella violacea (Guichenot, 1848), larvae and juveniles |
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| Authors: | Milton Bohórquez‐Cruz Wilfrido Argüello‐Guevara Alfonso Silva |
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| Affiliation: | 1. Magíster en Acuicultura, Departamento de Acuicultura, Facultad de Ciencias del Mar, Universidad Católica del Norte, Larrondo, Coquimbo, Chile;2. Doctorado en Acuicultura, Departamento de Acuicultura, Facultad de Ciencias del Mar, Universidad Católica del Norte, Larrondo, Coquimbo, Chile;3. Departamento de Acuicultura, Facultad de Ciencias del Mar, Universidad Católica del Norte, Larrondo, Coquimbo, Chile |
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| Abstract: | Seriolella violacea, a new species to be potentially farmed in Chile and Peru, has shown cranial malformations during farming that could adversely affect its commercial development. This study seeks to generate early knowledge of the osteological development and type of cranial abnormalities that this species presents under culture conditions. Larvae from wild caught broodstock were reared from 1 to 60 days post hatching (DPH) (4.8 ± 0.1 mm TL and 11.8 ± 1.0 mm TL respectively). Larvae samples were collected throughout the experimental trial for recording cranial osteological development and abnormalities in cartilage and bone. At 5.7 ± 0.1 mm TL, coraco‐scapular, sclerotic, ethmoid plate and quadrate cartilages were present. At 8.0 ± 0.6 mm TL, early ossification was observed in the jaw, premaxilla and maxilla. At 11.8 ± 1.0 mm TL, the branchiostegal rays, jaw, maxilla and opercular complex were ossified. The first cartilaginous structures observed were the Meckel's cartilage, the branchial arches and the suspensory ligament. The first cranial malformations were detected at 5.7 ± 0.1 mm TL, coinciding with mouth opening. The most frequent malformations were a curvature of the lower jaw (23.1%), abnormal separation between branchial arches and the Meckel's cartilage (19.4%) and bulging jaws (15.7%). |
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| Keywords: | abnormalities cartilage bone ossification
Seriolella violacea
larvae |
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