Vives, A., B.P., Ceballos-Vázquez, M.D., Herrero-Pérezrul, T., Rubilar & R., Civera Cerecedo (2023). Effect of formulated diets on the gonad quality of the sea urchin Tripneustes depressus. Aquaculture America 2023. New Orleans, Estados Unidos de América, febrero 23 - 26, 2023, 594.
Ailet Vives 1, Bertha Patricia Ceballos-Vázquez 2, María Dinorah Herrero-Pérezrul 2, Tamara Rubilar 3 y Roberto Civera Cerecedo 4
The sea urchinTripneustes depressus is a potential fishing resource on the coast ofBaja California Sur due to the quality of its gonads for human consumption. Analternative to increase gonadal quality in cultivation is to control thenutritional balance of the feed. The effect of different formulated diets onthe quality of T. depressus gonads was evaluated.
Three balancedfeeds were formulated and elaborated, two based on previously selected algae (Eiseniaarborea, Sargassum sinicola), and a mixed one combining both. Sixtyorganisms (8-11 cm in diameter) previously acclimatized without feeding (threereplicates of 20 organisms for each treatment) and three controls with eachtype of natural algae were placed in the laboratory. The organisms were fed adlibitum for three months. At the end of the experiment, the quality of thegonads was evaluated for each treatment, considering characteristics such asgonadal weight, color, texture, firmness, and flavor. Additionally, to know theinitial conditions, 20 wild organisms recently collected and 20 after theacclimatization period were sacrificed, as well as at the end of the experimentanother 20 wild organisms were sacrificed.
The highestgonadal weights were found in the wild organisms before and after theexperiment, as well as in the treatment with E. arborea, withsignificant differences being found between these and the rest of thetreatments (H=165.46; p<0.0001). When analyzing the quality characteristicsby treatment, we can observe the highest percentages of "excellent"and "very good" gonads in the organisms prior to and at the end ofthe experiment, as well as in the treatment with E. arborea, findingsignificant differences between these and the rest of the treatments (Color:H=105.93, p<0.0001; Texture: H=128.06, p<0.0001; Firmness: H=135.90,p<0.0001; Taste: H=78.37, p<0.0001). In particular, the color parametersshowed high values ??of L and low values ??of a in alltreatments, and higher values ??of b in the organisms before and afterthe experiment, as well as in the treatment with E. arborea. The ?Lab values ??were lower in the organisms before and after theexperiment, as well as in the treatment with E. arborea, whichcorresponds to gonads with better coloration, presenting significantdifferences between these and the rest of the treatments (L: H=34.85,p<0.0001, a: H=59.13, p<0.0001, b: H=123.10, p<0.0001, ?Lab: H=99.65, p <0.0001).
Apparently,the use of algae, specifically E. arborea, was favorable in theformulation of balanced food in T. depressus, obtaining good qualitygonads when using this species of algae naturally. The commercial quality ofthe gonads of this species could represent a viable alternative for thedevelopment of sea urchin aquaculture in Mexico.
Palabras clave: Uni; echinoderm
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