Growth rates of Haliotis rufescens and Haliotis discus hannai in tank culture systems in southern Chile (41.5ºS)

Abstract

ABSTRACT. The increased activity of aquaculture in Chile involves cultivation of salmonids, oysters mussels and other species such, and to a lesser extent species such as red abalone (Haliotis rufescens) and Japanese abalone (Haliotis discus hannai). The aim of this study was to evaluate the growth rate of Haliotis rufescens and Haliotis discus hannai fed with different pellet based diets with Macrocystis sp. and Ulva sp., grown in ponds for 13 months. The results for both species denoted that there was an increase in length and biomass during experimental period, existing low growth rates during the austral winter (July-September) and increase during the austral summer (December-January). Results are consistent with descriptions of literature that there is high rate of growth during the summer and using diet of brown algae. From the economic standpoint abalone farming would be an economically viable activity for local aquaculture, considering the water quality and food requirements. Keywords: abalone, Haliotis rufescens, Haliotis discus hannai, growth rate, aquaculture. Tasas de crecimiento de Haliotis rufescens y Haliotis discus hannai en cultivos en estanques en el sur de Chile (41,5°S)RESUMEN. El incremento de las actividades de acuicultura en Chile involucra principalmente cultivo de salmónidos, ostiones, algas, mitílidos y otras especies, y en menor escala especies como los abalones rojo (Haliotis rufescens) y japonés (Haliotis discus hannai). El objetivo del presente estudio fue evaluar el crecimiento de Haliotis rufescens y Haliotis discus hannai alimentados con diferentes dietas a base de pellet Macrocystis sp. y Ulva sp., cultivados en estanques durante 13 meses. Los resultados para ambas especies denotaron que hubo incremento en longitud y biomasa durante el periodo experimental, existiendo bajas tasas de crecimiento durante invierno austral (julio-septiembre) e incremento durante el verano austral (diciembreenero). Los resultados concuerdan con las descripciones de la literatura en que hay altas tasas de crecimiento durante el verano usando dieta a base de algas pardas. Desde el punto de vista económico el cultivo de abalones sería una actividad económicamente viable para la acuicultura local, si se considera los requerimientos de calidad de agua y alimentación.

Genotyping-by-Sequencing of the regional Pacific abalone (Haliotis discus) genomes reveals population structures and patterns of gene flow

“…rufescens can reach up to 31cm, making it the largest abalone species in the world, and the shell length of H . discus varies between 10cm to 15cm [ 74 ]. Also, H .…”

Scientific research on exotic and native mollusk farming in Mexico ac-cording to SCOPUS

“…It is important to note that not all exotic mollusks have negative effects, some introduced bivalves can even generate welfare to ecosystems by increasing water filtration capacity and decreasing the effects of eutrophication (Burlakova et al, 2023), as well as antiviral medicinal and commercial uses (Khan and Liu, 2019). There is equal populations (Mardones et al, 2013); such algae generate opportunities to meet other needs because the alginates produced in the processing of algae have nutraceutical properties and important industrial uses (Hernández-Carmona et al, 2012). However, the introduction of exotic species into new habitats should always be carefully evaluated and regulated to minimize potential negative impacts on local ecosystems and species (Gubiani et al, 2018).…”

Factors influencing half‐pearl (mabe) production and quality in the red abalone Haliotis rufescens

“…and cultivated at their facilities from August 2012 to April 2013 (251 days). These sizes were selected because more than 80% of the abalone cultured population in Chile is within 50-100 mm shell length (Flores-Aguilar, Gutierrez, Ellwanger, & Searcy-Bernay, 2007;Mardones, Augsburger, Vega, & de Los Ríos-Escalante, 2013) and determining if the meat and pearls could be harvested simultaneously was important for the industry. For both cohorts, abalone were maintained outdoors in 5,000 L raceways covered by 45% shade-cloth roofs and provided with constant flow of raw seawater at 42 L/min.…”