Histological study of the gastrointestinal tract in longfin yellowtail (Seriola rivoliana) larvae

Abstract

This work contributes basic knowledge on larval development of Seriola rivoliana. A histological study describes the development of the digestive tract and accessory glands in S. rivoliana larvae reared under laboratory conditions at 24 °C from hatching to 30 days post-hatching (DPH). At hatching (2.6 ± 0.12 mm), larvae had an undifferentiated digestive tract with a closed straight tube and a large yolk sac with an oil globule. The liver and pancreas were observed at 1 and 2 days, and the mouth and anus opened at day 2. Enriched rotifers were visible in their digestive tract. At the beginning of the pre-flexion stage, a mixed nutritional period was observed. At day 3, exogenous feeding began; the digestive tract became differentiated into the buccopharynx, esophagus, an undifferentiated stomach, and the intestines. Zymogen granules were visible in the exocrine pancreas. At day 4, supranuclear vacuoles were present in the posterior intestine, indicating the beginning of intracellular digestion. At day 5, goblet cells were present in the esophagus and became functional at day 7 in the esophagus and intestine. The buccopharynx goblet cells developed at day 15. The presence of gastric glands and differentiation of the stomach in the fundic, cardiac, and pyloric regions during the post-flexion stage occurred at day 20. This was the onset of the juvenile period and the beginning of weaning; however, a long co-feeding phase is recommended. Pyloric caeca were observed at day 30 (13.6 ± 1.6 mm). These results provide valuable information on S. rivoliana larvae biology and digestive physiology, which should be useful to improve cultivation techniques and identify ecological features involved in ontogeny.

Development of the digestive system of Argentine hake, Merluccius hubbsi, larvae

“…The liver was distinct from hatching on and lipid vacuoles in hepatocytes could be observed in flexion and postflexion stages. These vacuoles, probably containing lipid, were also described in M. merluccius (Ortiz‐Delgado et al, 2012), Alosa sapidissima (Hong, Zhu, Chen, Pan, & Li, 2013) and Seriola rivoliana (Teles et al, 2017). The greater presence of lipids in hepatocytes in advanced stages could suggest higher lipid content in the diet of larger larvae, or a greater efficiency in digestion, absorption, and storage of lipids (Teles et al, 2017).…”

“…These vacuoles, probably containing lipid, were also described in M. merluccius (Ortiz‐Delgado et al, 2012), Alosa sapidissima (Hong, Zhu, Chen, Pan, & Li, 2013) and Seriola rivoliana (Teles et al, 2017). The greater presence of lipids in hepatocytes in advanced stages could suggest higher lipid content in the diet of larger larvae, or a greater efficiency in digestion, absorption, and storage of lipids (Teles et al, 2017). The exocrine pancreas of teleost fish is generally diffusely disseminated in the abdominal cavity within the fat and mesentery that connect the intestine, stomach, liver, and gallbladder (Nessi et al, 1998; Youson et al, 2006).…”

Immune and Antioxidant Enzyme Response of Longfin Yellowtail (Seriola rivoliana) Juveniles to Ultra-diluted Substances Derived from Phosphorus, Silica and Pathogenic Vibrio

“…In several countries, the Longfin yellowtail Seriola rivoliana (Carangidae) is considered as one of the fish with the greatest potential for intensive aquaculture because of its fast growth, high meat quality and adaptability to intensive farming con-ditions. 1,2 Studies have been performed in S. rivoliana on spawning and larviculture, digestive ontogeny, osseous development, feeding and management of broodstock, and embryo toxicology, among others. 1,[3][4][5][6][7] Nonetheless, little information is available related to the immune and antioxidant defense system, which could provide fundamental information for improving productivity and developing new cropping technologies.…”

“…1,2 Studies have been performed in S. rivoliana on spawning and larviculture, digestive ontogeny, osseous development, feeding and management of broodstock, and embryo toxicology, among others. 1,[3][4][5][6][7] Nonetheless, little information is available related to the immune and antioxidant defense system, which could provide fundamental information for improving productivity and developing new cropping technologies. Problems caused by bacteria, viruses and parasites have been reported as limiting factors in culture of several species including Seriola spp.…”

Ontogenetic development of digestive tract and digestive enzymatic activities inSqualiobarbus curriculuslarvae

“…Digestive ability is critical in fish metabolism and significantly affects the acquisition of nutrients from the diet. Besides, the efficiency of the whole digestive process mainly depends on type and function of digestive enzymes (Teles et al, ). The study of digestive enzymes reflects the adaptability of the changes in diet (Gisbert, Giménez, Fernández, Kotzamanis, & Estévez, ).…”