The Influence of Various Feeding and Pond Fertilization Strategies on Nile Tilapia (Oreochromis niloticus L.) Production and the Selectivity for Natural Versus Supplementary Diet in Semi‐Intensive Aquaculture Systems

Aquaculture Fish and Fisheries, Journal Year: 2025, Volume and Issue: 5(1)

Published: Jan. 8, 2025

ABSTRACT High feed costs constrain tilapia production, making exploring low‐cost feeding strategies important. We assessed the growth of over a period 6 months, fed 1%, 2%, or 4% body mass day −1 with and without fertilization in 18 liner ponds stocked fingerlings (5.1 ± 0.71 g). Growth was significantly better fertilized than unfertilized ponds. The best (320.7 8.5 g) where fish were achieving 45% larger weight gain group These results show that fertilization, can be reduced by half while still having In 4%, minimum nocturnal oxygen levels may have limited and, as result, their final (180.1 6.6 lower groups 2% Fish up to 60–90 g rely mainly on zooplankton source food, sizes ≥100 supplementary feed. Analysis gut content different suggested do not consume presented which instead ends an expensive form fertilizer. economic return 2%. It is concluded feed‐use production even further fertilizing restricting omitting < 100 only commence when reached around g. finding wider applicability developing countries pond culture common.

Language: Английский

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Morphology and Histology of the Digestive System of Japanese Mantis Shrimp (Oratosquilla oratoria)

Fishes, Journal Year: 2025, Volume and Issue: 10(2), P. 71 - 71

Published: Feb. 10, 2025

This study investigated the characteristics of digestive system in adult Japanese mantis shrimp (Oratosquilla oratoria), which is a species carnivorous crustacean, with focus on morphological and histological analysis. The O. oratoria includes mouthparts, esophagus, cardiac stomach, pyloric midgut, hindgut, anus hepatopancreas. structure each organ composed mucosal epithelial layer, submucous muscularis, outer membrane. Besides, foregut covered diverse chitinous layer. labrum densely populated minor salivary glands. mandibular-gastric mill apparatus evenly arranged bifurcated setae are observed stomach. secondary filter stomach subtly intricate, fine spicules seta plate. being longest segment tract accounting for 59.39% body length, has villi dense microvilli. hindgut also forms villi, but height (695.96 μm) 3.20 times that midgut (217.41 μm). hepatopancreas encircles entire hindgut. hepatosomatic index approximately 3.83%.

Language: Английский

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Rapid Egestion of Microplastics in Juvenile Barramundi: No Evidence of Gut Retention or Tissue Translocation

Environmental Pollution, Journal Year: 2025, Volume and Issue: unknown, P. 125884 - 125884

Published: Feb. 1, 2025

Language: Английский

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Nitrogen excretion and oxygen consumption under severe hypoxia in siluriform fishes from the Amazon

Journal of Fish Biology, Journal Year: 2025, Volume and Issue: unknown

Published: March 15, 2025

Abstract Siluriform fishes collected from the Rio Negro and Solimões proved to be highly resistant aquatic hypoxia. In all four species analysed in this study, oxygen consumption significantly decreased normoxic levels at water PO 2 values near 1 kPa. Air‐breathing activity was observed only Sturisoma sp. (Rio Negro). species, under severe hypoxia, uptake air dominated, but total lower than that conditions. Anadoras weddellii Solimões), surface respiration detected. However, other ( Tympanopleura atronasus three members of family Sternopygidae; Solimões) showed no attempt supplement uptake, even tested, neither ammonia nor urea‐N excretion affected by decreasing . At lowest levels, reduction face unchanged nitrogenous waste resulted extraordinary high nitrogen quotient (NQ) ratios. normoxia, NQ ratios ranged 0.16 0.34. Urea‐N contributed between 19% 28% appeared unrelated natural diet as indicated gut length‐to‐fork length ratio or plasma levels. Overall, our data underline quantitative importance for siluriform fishes.

Language: Английский

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Variable phylosymbiosis and cophylogeny patterns in wild fish gut microbiota of a large subtropical river

mSphere, Journal Year: 2025, Volume and Issue: unknown

Published: March 28, 2025

ABSTRACT The persistence and specificity of fish host-microbial interaction during evolution is an important part exploring the symbiosis mechanism. However, it remains unclear how environmental host factors shape host-microbe symbiotic relationships in subtropical rivers with complex natural environments. Freshwater are consumers lakes considered keystone species maintaining stability food webs there. In this study, patterns mechanisms shaping gut microbiota community 42 from Pearl River, zone China, were investigated. results showed that a key driver diversification. Different taxonomic levels different degrees contribution to variation. Geographical location habitat type next most across fishes, followed by diet trait. Our emphasized stochastic processes (drift homogenizing dispersal) microbial assembly freshwater fishes middle lower reaches River. Phylosymbiosis evident at both global local levels, which jointly shaped including ecological or physiological filtration evolutionary processes. core co-evolutionary varying groups. We speculate genetic isolation variation facilitates heterogeneous selection (deterministic process), occurs host-core bacterium specificity. IMPORTANCE regarded as dominant lakes. Due their diverse feeding modes, significantly enhance trophic link nutrient recycling/retention aquatic habitats. For this, they often A significant nutrition essentially mediated microbiota, can tolerance fluctuations external resources improve efficiency nutrients extracted various sources. As bacterial symbionts have profound impact on development hosts, well overall fitness, critical answer question hosts maintain these benefits procuring inheriting vital symbionts, still largely unanswered, especially for fish. study provides new insights into relationship between wild microbiome, hidden diversity adaptation potential

Language: Английский

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Arsenic species in coastal marine fish species from the Southwest Atlantic Ocean: Human health risk implications

Marine Pollution Bulletin, Journal Year: 2025, Volume and Issue: 216, P. 117971 - 117971

Published: April 17, 2025

Language: Английский

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Quercetin Supplementation Improves Intestinal Digestive and Absorptive Functions and Microbiota in Rats Fed Protein-Oxidized Soybean Meal: Transcriptomics and Microbiomics Insights

Animals, Journal Year: 2024, Volume and Issue: 14(16), P. 2326 - 2326

Published: Aug. 12, 2024

To clarify the nutritional mechanisms of quercetin mitigation in digestive and absorptive functions rats fed protein-oxidized soybean meal, 48 three-week-old male SD were randomly allocated into a 2 × factorial design with two meal types (fresh or meal) levels (0 400 mg/kg) for 28-day feeding trial. The treatment decreased (p < 0.05) relative weights pancreas, stomach, cecum, duodenal villus height, pancreatic jejunal lipase activities, apparent ileal digestibility amino acids, total tract dry matter, crude protein, ether extract. supplementation diet reversed decreases length, activity, Transcriptomics revealed that “alanine transport” “lipid digestion absorption” pathways downregulated by compared fresh while “basic acid transmembrane transporter activity” upregulated supplementation. Microbiomics increased protein-degrading inflammation-triggering bacteria abundances beneficial elevated

Language: Английский

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Adaptive cellular evolution in the intestinal tracts of hyperdiverse African cichlid fishes

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 1, 2024

Adaptations related to how nutrients are acquired and processed play a central role in the colonization of novel ecological niches and, therefore, organismal diversification. While evolution feeding structures has been studied extensively this context, nature dietary adaptations digestive tract remains largely unexplored. Here, we investigate cellular molecular basis massive radiation cichlid fishes Lake Tanganyika using comprehensive single-cell transcriptomic data derived from intestines 24 endemic species with distinct habitats diets. We show that, at level, primarily driven by anterior enterocytes, that both relative abundance gene expression profiles these cells have evolved response rapid specializations. These rapidly evolving cell population-specific genes, suggesting alterations epithelial specification programs makeup promote

Language: Английский

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Does intestine length explain digesta retention times in birds and mammals?

Comparative Biochemistry and Physiology Part A Molecular & Integrative Physiology, Journal Year: 2024, Volume and Issue: 300, P. 111789 - 111789

Published: Dec. 9, 2024

Previous studies have indicated that across birds and mammals, body mass is a comparatively poor predictor of the time digesta retained in digestive tract (mean retention time, MRT). Rather, MRT might be determined by gastrointestinal anatomy, which can differ considerably within between trophic guilds. Here, we used two recent literature compilations on intestine length (n = 33 species) mammals 149) applied comparative statistical approaches to assess whether more closely correlated with than mass. Regardless model used, small species (< 120 g any larger bats) were included or not, assessed together separately, intestinal generally yielded better fit mass, supporting general concept. Nevertheless, data scatter was substantial, indicating length, though still limited explanatory factor for MRT. The length-MRT relationship an example direct assessment presumed form-function typically represented as narrative. In literature, such assessments are rare.

Language: Английский

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Effects of commercial feeds and frozen trash fish on growth and hematological parameters of juvenile silver arowana Osteoglossum bicirrhosum

Aquaculture International, Journal Year: 2024, Volume and Issue: 33(1)

Published: Nov. 15, 2024

Language: Английский

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