Digestible protein levels and metabolic responses in juvenile piapara (Megaleporinus obtusidens)
The piapara (Megaleporinus obtusidens) is an omnivorous fish with great market potential. However, little is known about its dietary requirements. This study aimed to determine the effects of dietary protein on growth and physiological indicators in piapara. Three hundred piapara juveniles (24.0 ±...
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Instituto de Pesca
2023-05-01
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| Series: | Boletim do Instituto de Pesca |
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| Online Access: | https://institutodepesca.org/index.php/bip/article/view/1806 |
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| author | Viviane do Nascimento Santana de Almeida Gabriela Castellani Carli Thaise Mota Sátiro Thiago Matias Torres do Nascimento Leonardo Susumu Takahashi |
| author_facet | Viviane do Nascimento Santana de Almeida Gabriela Castellani Carli Thaise Mota Sátiro Thiago Matias Torres do Nascimento Leonardo Susumu Takahashi |
| author_sort | Viviane do Nascimento Santana de Almeida |
| collection | DOAJ |
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The piapara (Megaleporinus obtusidens) is an omnivorous fish with great market potential. However, little is known about its dietary requirements. This study aimed to determine the effects of dietary protein on growth and physiological indicators in piapara. Three hundred piapara juveniles (24.0 ± 1.3 g) were distributed in 20 tanks of 130-L (15 fish/tank) provided with continuous aeration and water. Five isoenergetic diets (14.0 MJ/kg) were formulated to contain increasing levels of digestible protein (21, 24, 27, 30, and 33% DP). After 77 days, weight gain and ammonia concentration in water were found to increase linearly with increasing digestible protein (DP) level (p<0.05). Protein productive value (PPV) reached a maximum at 28.4% DP. No relationship was found between DP level and serum ammonia, liver alanine aminotransferase (ALT) activity, hepatosomatic index (HSI), liver glycogen (GL) or liver lipid (LL) content (p>0.05). Mesenteric fat index (MFI) and liver malic enzyme (ME) activity followed a quadratic pattern (p<0.05) and reached a maximum at 25.8% and 27.1% DP, respectively. Muscle lipid (ML) content decreased linearly with increasing DP level (p<0.05), whereas liver glucose-6-phosphate dehydrogenase (G6PD) activity decreased linearly as DP level increased (p<0.05). Results showed that a diet containing 28.4% PD provides better crude protein retention efficiency and reduces amino acid deamination in M. obtusidens. Low protein diets increased energy retention efficiency, whereas fish fed high protein diets had higher ammonia excretion.
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| format | Article |
| id | doaj-art-7ab680974b7649e497e7e8b9100b45cc |
| institution | DOAJ |
| issn | 1678-2305 |
| language | English |
| publishDate | 2023-05-01 |
| publisher | Instituto de Pesca |
| record_format | Article |
| series | Boletim do Instituto de Pesca |
| spelling | doaj-art-7ab680974b7649e497e7e8b9100b45cc2025-08-20T03:06:52ZengInstituto de PescaBoletim do Instituto de Pesca1678-23052023-05-014910.20950/1678-2305/bip.2023.49.e754Digestible protein levels and metabolic responses in juvenile piapara (Megaleporinus obtusidens)Viviane do Nascimento Santana de Almeida0Gabriela Castellani Carli1Thaise Mota Sátiro2Thiago Matias Torres do Nascimento3Leonardo Susumu Takahashi4Universidade Estadual Paulista “Júlio de Mesquita Filho”, Faculdade de Ciências Agrárias e Tecnológicas – Dracena (SP), Brazil.Universidade Estadual Paulista “Júlio de Mesquita Filho” , Centro de Aquicultura – Jaboticabal (SP), Brazil.Universidade Estadual Paulista “Júlio de Mesquita Filho” , Centro de Aquicultura – Jaboticabal (SP), Brazil.Universidade Estadual Paulista “Júlio de Mesquita Filho”, Centro de Aquicultura – Jaboticabal (SP), Brazil.Universidade Estadual Paulista “Júlio de Mesquita Filho”, Faculdade de Ciências Agrárias e Tecnológicas – Dracena (SP), Brazil |Universidade Estadual Paulista “Júlio de Mesquita Filho”, Centro de Aquicultura – Jaboticabal (SP), Brazil. The piapara (Megaleporinus obtusidens) is an omnivorous fish with great market potential. However, little is known about its dietary requirements. This study aimed to determine the effects of dietary protein on growth and physiological indicators in piapara. Three hundred piapara juveniles (24.0 ± 1.3 g) were distributed in 20 tanks of 130-L (15 fish/tank) provided with continuous aeration and water. Five isoenergetic diets (14.0 MJ/kg) were formulated to contain increasing levels of digestible protein (21, 24, 27, 30, and 33% DP). After 77 days, weight gain and ammonia concentration in water were found to increase linearly with increasing digestible protein (DP) level (p<0.05). Protein productive value (PPV) reached a maximum at 28.4% DP. No relationship was found between DP level and serum ammonia, liver alanine aminotransferase (ALT) activity, hepatosomatic index (HSI), liver glycogen (GL) or liver lipid (LL) content (p>0.05). Mesenteric fat index (MFI) and liver malic enzyme (ME) activity followed a quadratic pattern (p<0.05) and reached a maximum at 25.8% and 27.1% DP, respectively. Muscle lipid (ML) content decreased linearly with increasing DP level (p<0.05), whereas liver glucose-6-phosphate dehydrogenase (G6PD) activity decreased linearly as DP level increased (p<0.05). Results showed that a diet containing 28.4% PD provides better crude protein retention efficiency and reduces amino acid deamination in M. obtusidens. Low protein diets increased energy retention efficiency, whereas fish fed high protein diets had higher ammonia excretion. https://institutodepesca.org/index.php/bip/article/view/1806PerformancePhysiological indicatorsOmnivorousEnergy retention |
| spellingShingle | Viviane do Nascimento Santana de Almeida Gabriela Castellani Carli Thaise Mota Sátiro Thiago Matias Torres do Nascimento Leonardo Susumu Takahashi Digestible protein levels and metabolic responses in juvenile piapara (Megaleporinus obtusidens) Boletim do Instituto de Pesca Performance Physiological indicators Omnivorous Energy retention |
| title | Digestible protein levels and metabolic responses in juvenile piapara (Megaleporinus obtusidens) |
| title_full | Digestible protein levels and metabolic responses in juvenile piapara (Megaleporinus obtusidens) |
| title_fullStr | Digestible protein levels and metabolic responses in juvenile piapara (Megaleporinus obtusidens) |
| title_full_unstemmed | Digestible protein levels and metabolic responses in juvenile piapara (Megaleporinus obtusidens) |
| title_short | Digestible protein levels and metabolic responses in juvenile piapara (Megaleporinus obtusidens) |
| title_sort | digestible protein levels and metabolic responses in juvenile piapara megaleporinus obtusidens |
| topic | Performance Physiological indicators Omnivorous Energy retention |
| url | https://institutodepesca.org/index.php/bip/article/view/1806 |
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