Soto Andrade, I., J.L., Ortiz Galindo & M.O., Rosales Velázquez (2022). Morphological development in cultured barred sand bass Paralabrax nebulifer larvae. World Aquaculture 2021. Mérida, Yucatán, México, mayo 24 - 27, 2022, 1.
Imelda Soto Andrade 1, José Luis Ortiz Galindo 2 y Martín Oscar Rosales Velázquez 2
The study of the early life phases of marine fish, allows us to know the morphological changes that occur throughout development and make it possible to improve biotechnologies for the culture of species of interest. The barred sand bass Paralabrax nebulifer is the most important small-scale commercial fisheries along the Pacific coast of Baja California, Mexico, therefore, it is considered a species with aquacultural potential. The aim of the work is to contribute to the recognition of the main morphological changes during larval development until transformation of juvenile of barred sand bass,through the description of morphometry, meristics, pigmentation and squamation pattern.
During culture, the larvae were fed for 32 days on three diets (rotifers, Artemia nauplii, and microdiets). For the morphometric description, the phases of ontogenetic development were divided intoapterolarva, pterolarva and juvenile, based on the criteria of saltatory ontogeny. The conventionalmeasurements were taken from 219 specimens, corresponding to 112 apterolarva phase, 88 pterolarvaphase, and 19 juveniles. To detect allometric growth, the morphometric relationships of eachdevelopmental phase were used with the geometric mean regression line. A series of development wasrevealed for the study of meristics. The meristic pattern was outlined. The pigmentation pattern wasoutlined, as well as the squamation pattern. As results, the following development phases wereobserved: apterolarva phase, from 1.82-3.79 mm notochordal length (NL) (3-19 Days Post HatchingDPH; pterolarva phase (10-25 DPH), with the presence of fin primordia from 3.80-8.05 mm NL;juveniles (23-30 DPH)., with full finray complement from 8.06-11.27 mm standard length (SL).According to the analysis of the functional relationships of the morphometry, the growth during theapterolarva, pterolarva and juvenile phases, is presented isometrically. In the meristic study, it wasobserved that from the pterolarva phase, the presence of the fin elements is detected, starting at 5.05mm NL with the spine of the anal fin, together with the vertebral centers; later the rest of the fins, untilcompleting the count at 8.06 mm SL in the juvenile phase. In addition, the pigmentation and squamationpattern are described until transformation to juvenile. Finally, a feeding schedule from larvaldevelopment to juvenile of barred sand bass based on their morphological changes is proposed (Figure1).
Palabras clave: laboratory; larval development; morphometry; meristics; squamation pattern; pigmentation
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