Gastrointestinal emptying and daily patterns of activity of proteinolytic enzymes in Nile tilapia (Oreochromis niloticus)

Oliveira, Camila Gomes de; López‐Olmeda, José Fernando; Costa, Leandro Santos; Santo, Amanda Hastenreiter do Espirito; Santos, Fábio Aremil Costa dos; Luz, Ronald Kennedy; Ribeiro, Paula Adriane Pérez

doi:10.1016/j.aquaculture.2021.737338

Cited by 7 publications

(2 citation statements)

References 44 publications

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“…For example, the trypsin and chymotrypsin activities in foregut, midgut and hindgut of Nile tilapia showed significant daily rhythms. The enzyme activity in daytime was higher than that in night 24 . Moreover, the osmoregulatory role of the intestine is linked to acid–base balance in marine and euryhaline teleosts and its ability to effectively absorb fluid is essential to compensate for water loss in hypertonic environments 5 , 25 .…”

Section: Introductionmentioning

confidence: 71%

Intestinal ion regulation exhibits a daily rhythm in Gymnocypris przewalskii exposed to high saline and alkaline water

Wang

Zhu

Wei

et al. 2022

Sci Rep

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Naked carp (Gymnocypris przewalskii), endemic to the saline-alkaline Lake Qinghai, have the capacity to tolerate combinations of high salinity and alkalinity, but migrate to spawn in freshwater rivers each year. In this study, we measured the drinking rate over a 24 h period for naked carp exposed to saline-alkaline lake waters with salinities of 15 (L15) and 17 (L17). We also assessed the daily feed intakes of naked carp exposed to L15 and fresh water (FW). Additionally, we studied the daily expression of acid–base regulation and osmoregulation related genes and proteins in the intestine of naked carp exposed to saline-alkaline lake waters. Our results revealed that the drinking rate at night was significantly higher than in daytime when exposed to either L15 or L17, while feed intakes in daytime were significantly higher than at night. The relative expression of Na+/K+-ATPase α (NKA-α), solute carrier family members 26A6 (SLC26A6) and 4A4 (SLC4A4) in the intestine of naked carp exposed to L17 at night was higher than in daytime. Specifically, NKA-α mRNA expression at 4:00 was 7.22-fold and 5.63-fold higher than that at 10:00 and 16:00, respectively, and the expression at 22:00 was 11.29-fold and 8.80-fold higher than that at 10:00 and 16:00, respectively. Similarly, SLC26A6 mRNA expression was greatest at 22:00, exceeding that observed at 4:00, 10:00 and 16:00 by 3.59, 4.44 and 11.14-fold, respectively. Finally, the expression of NKA-α and SLC26A6 protein at the single cell level was also higher at night than during the day, which was 1.65-fold and 1.37-fold higher at 22:00 respectively compared to 16:00. Overall, the present findings revealed that naked carp drinks at night and feeds during the day, demonstrating that intestinal ion regulation exhibits a daily rhythm when exposed to high saline and alkaline lake water.

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Section: Introductionmentioning

confidence: 71%

Intestinal ion regulation exhibits a daily rhythm in Gymnocypris przewalskii exposed to high saline and alkaline water

Wang

Zhu

Wei

et al. 2022

Sci Rep

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“…Therefore, considerable BPs from tilapia processing plants can be available for autolytic hydrolysis if their maximal quality is preserved. Trypsin is one of the major serine proteases in tilapia intestine and viscera, showing MW of 22–28 kDa with optimal activity at a temperature of ∼50°C and pH of 8.0–9.0 (de Oliveira et al., 2022; Unajak et al., 2012; Zhou et al., 2013). Therefore, under optimal conditions for alkaline proteases and trypsin activities, tilapia BPs can be processed with endogenous proteases to yield peptides with increased digestibility.…”

Section: Application or Developed Technology For Production Of Hydrol...mentioning

confidence: 99%

Protein hydrolysates derived from aquaculture and marine byproducts through autolytic hydrolysis

Nikoo

Benjakul

Gavlighi

2022

Comp Rev Food Sci Food Safe

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Autolysis technology has shown potential for protein hydrolysates production from marine and aquaculture byproducts. Viscera are a source of cheap proteolytic enzymes for producing protein hydrolysates from the whole fish or processing byproducts of the most valuable commercial species by applying autolysis technology. The use of autolysis allows economical production of protein hydrolysate and provides an opportunity to valorize downstream fish and shellfish processing byproducts at a lower cost. As a result, production and application of marine byproduct autolysates is increasing in the global protein hydrolysates market. Nevertheless, several restrictions occur with autolysis, including lipid and protein oxidation mediated by the heterogeneous composition of byproducts. The generally poor storage and handling of byproducts may increase the formation of undesirable metabolites during autolysis, which can be harmful. The formation of nitrogenous compounds (i.e., biogenic amines), loss of freshness, and process of autolysis in the byproducts could increase the rate of quality and safety loss and lead to more significant concern about the use of autolysates for human food applications. The current review focuses on the autolysis process, which is applied for the hydrolysis of aquaculture and marine discards to obtain peptides as functional or nutritive ingredients. It further addresses the latest findings on the mechanisms and factors contributing the deterioration of byproducts and possible ways to control oxidation and other food quality and safety issues in raw materials and protein hydrolysates.

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Diet-habitat ecology of invasive tilapia and native fish in a tropical river catchment following a tilapia invasion

O’Mara,

Venarsky,

Marshall

et al. 2023

Biol Invasions

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Many species of tilapia (a collection of fish species from the cichlidae family) have biological traits that make them successful invaders. Widespread herbivory has been observed across tilapia species, however knowledge on habitat preferences and tilapia interactions with native fish food webs is limited. This study was conducted three years after spotted (Pelmatolapia mariae) and Mozambique (Oreochromis mossambicus) tilapia were detected in the Mitchell River catchment, northern Australia. Tilapia diet and habitat preferences and their trophic position in native fish food webs was determined using a combination of stomach content, stable isotope, and habitat assessment analyses. Plant material was the most abundant item in tilapia stomachs, and some stomachs also contained other items in small quantities, such as fish eggs, small shrimp, and bivalves. Some niche overlap occurred between P. mariae and native omnivore or herbivore fish species. Macrohabitat type (in-channel (no tilapia), floodplain (no tilapia), weir (tilapia present)) was related to native fish food web structure, with weir food webs showing similarities to floodplain food webs. Floodplain habitats including creeks and wetlands were also most similar to weir habitats and may therefore be most at risk of colonization as tilapia spread throughout the catchment. This study clearly demonstrated that the successful rapid invasion of these two tilapia species is linked to suitable habitat with abundant food that fuels growth and reproduction. These findings increase understanding of diet related habitat use during new tilapia invasions and trophic interactions with native species.

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Gastrointestinal emptying and daily patterns of activity of proteinolytic enzymes in Nile tilapia (Oreochromis niloticus)

Cited by 7 publications

References 44 publications

Intestinal ion regulation exhibits a daily rhythm in Gymnocypris przewalskii exposed to high saline and alkaline water

Intestinal ion regulation exhibits a daily rhythm in Gymnocypris przewalskii exposed to high saline and alkaline water

Protein hydrolysates derived from aquaculture and marine byproducts through autolytic hydrolysis

Diet-habitat ecology of invasive tilapia and native fish in a tropical river catchment following a tilapia invasion

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