Isolation, culture and evaluation of Chaetoceros muelleri from the Caribbean as food for the native scallops, Argopecten nucleus and Nodipecten nodosus

Abstract

The potential of the Caribbean strain Chaetoceros muelleri (CHA-C-04) to be produced and used as diet of two commercially important native scallops (Argopecten nucleus and Nodipecten nodosus) was assessed, using the non-indigenous Chaetoceros calcitrans strain, as a control. Growth and biomass of both diatoms were compared under different culture environments (indoor and outdoor) and culture media (F/2, organic fertilizer triple 15 and humus extract). In addition, their bromatological composition and effect on the physiological condition of the scallops fed with both diatoms were compared. The growth and biomass production of C. muelleri and C. calcitrans were higher under indoor conditions and using the F/2 media. Although the content of proteins, lipids and energy was higher in C. muelleri than in C. calcitrans, its size, organic content, growth and biomass values were not different. Scallops fed with both diatoms strains shows similar values for all of the physiological variables measured, including rates of absorption, oxygen consumption, ammonia excretion and scope for growth. Results suggest that the local strain C. muelleri can be successfully produced and used in the diet of A. nucleus and N. nodosus, but do not offer productive advantages.

Optimisation of Biomass Production and Nutritional Value of Two Marine Diatoms (Bacillariophyceae), Skeletonema costatum and Chaetoceros calcitrans

“…For C. calcitrans, the protein contents ranged between 15.3-16.9% DW. These results differed from what has been reported in the literature, where the total protein content ranged between 31.3-41.6% DW [22,23,41,64].…”

“…The carbohydrate content that was detected in this work for S. costatum was similar to what is found in the literature, where values ranged between 4.6-26.4% DW [22,23,25]. The same trend was observed for C. calcitrans, whose carbohydrate contents that were detected (23.4-26.1% DW), were consistent with what has been described in the literature where the values range between 6-37% DW [22,23,41,64]. Overall, the integration of growth data with proximal composition demonstrates two outcomes: altering the culture medium composition for S. costatum highly influenced both culture growth and the proximal composition of the cultures, and for C. calcitrans, this optimisation of the culture medium had only a more pronounced effect on culture growth itself (Figure 5).…”

“…The present work demonstrates the high nutrient storage capacity of diatoms, as well as an elevated rate of cell wall silicification, which could explain the elevated ash contents previously described in S. costatum cultures [59][60][61]. [22,23,41,64]. Overall, the integration of growth data with proximal composition demonstrates two outcomes: altering the culture medium composition for S. costatum highly influenced both culture growth and the proximal composition of the cultures, and for C. calcitrans, this optimisation of the culture medium had only a more pronounced effect on culture growth itself (Figure 5).…”

Perfil nutricional de cepas de microalgas peruanas de los géneros Chaetoceros y Skeletonema de la costa central del Perú como ingrediente potencial para acuicultura

“…Las cepas seleccionadas fueron obtenidas, identificadas y codificadas por el Banco de Germoplasma de Organismos Acuáticos (BGOA) presentando las siguientes características (Tabla 1): high protein content and EPA. Among the most prominent genera are Skeletonema, Phaeodactylum, Chaetoceros, and Thalassiosira (Hernández and Labbé, 2014;Velasco et al, 2016;Araújo et al, 2020).…”

“…Many research studies on aquaculture catalogue diatoms as suitable food for the cultivation of organisms of commercial interest, e.g., in bivalves, for the early larval stages of crustaceans, and in some fish species, given their organismos de interés comercial, por ejemplo, en bivalvos, para los primeros estadios larvales de crustáceos y algunas especies de peces, debido a su alto contenido proteico y EPA. Entre los géneros más destacados se encuentran Skeletonema, Phaeodactylum, Chaetoceros y Thalassiosira (Hernández y Labbé, 2014;Velasco et al, 2016;Araújo et al, 2020).…”