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Fish feeding

J T Verba, M Lima de Oliveira Borges, M N Ferreira da Silva, L Costa Pinto, J G Rabello Neto
Two silver arowana, Osteoglossum bicirrhosum, one male (49.5 cm standard length, LS ) and one female (52.5 cm LS ) that had fed on small-eared colilargo or small-eared pygmy rice rat Oligoryzomys microtis, were sampled during the rising water period in the Brazilian Amazon. The identified prey were 6 and 8 cm long and occupied the entire stomachs of both individuals. This opportunistic feeding behaviour appears to be a strategy for this fish to acquire nutrients during times when its usual aquatic prey is dispersed throughout the flooded forest...
June 23, 2018: Journal of Fish Biology
Federica Camin, Matteo Perini, Luana Bontempo, Marco Galeotti, Emilio Tibaldi, Edi Piasentier
Multielement isotope ratio was assessed in fat and defatted (protein) fillet of 130 rainbow trout, reared with feed incorporating a high or low fish content in 20 Italian farms, focusing on two northern Italian regions (Friuli Venezia Giulia and Trentino). The aim was to investigate the ability of isotopic analysis to trace the geographical origin of trout, also according to the type of feed. The carbon, nitrogen and sulphur isotope ratios of feed and fillet were highly positively correlated both within each matrix (feed or fillet) and between the two matrices and negatively correlated with the δ2 H and δ18 O of feed and the δ2 Hfat ...
November 30, 2018: Food Chemistry
Joana F Monteiro, Sandra Martins, Matheus Farias, Telma Costa, Ana Catarina Certal
Zebrafish ( Danio rerio ) is one of the top model organisms used in biomedical research. Therefore, it is fundamental that zebrafish facilities continuously improve husbandry methods to provide fish with the best physiological and welfare conditions that suit each experimental purpose. Nutrition is a husbandry aspect that needs further optimization, as it greatly affects growth, reproduction, health and behaviour. Here, we have compared the impact of different feeding regimens on zebrafish survival, growth and reproductive performance...
June 21, 2018: Journal of Developmental Biology
Jianzhu Wang, Duane Chapman, Jun Xu, Yang Wang, Binhe Gu
[This corrects the article DOI: 10.1371/journal.pone.0197584.].
2018: PloS One
Ana Luísa Maulvault, Lúcia H M L M Santos, Carolina Camacho, Patrícia Anacleto, Vera Barbosa, Ricardo Alves, Pedro Pousão Ferreira, Albert Serra-Compte, Damià Barceló, Sara Rodriguez-Mozaz, Rui Rosa, Mário Diniz, António Marques
The presence of antidepressants, such as venlafaxine (VFX), in marine ecosystems is increasing, thus, potentially posing ecological and human health risks. The inherent mechanisms of VFX uptake and elimination still require further understanding, particularly accounting for the impact of climate change-related stressors, such as warming and acidification. Hence, the present work aimed to investigate, for the first time, the effects of increased seawater temperature (ΔT°C = +5 °C) and pCO2 levels (ΔpCO2 ∼1000 μatm, equivalent to ΔpH = -0...
June 2, 2018: Chemosphere
Won Je Jang, Jong Min Lee, Yu-Ri Kim, Md Tawheed Hasan, In-Soo Kong
Bacillus sp. SJ-10 (KCCM 90078, JCM 15709) is a halotolerant bacterium isolated from a traditional Korean food, i.e., salt-fermented fish (jeotgal). The bacterium can survive and engage in metabolism at high salt concentrations. Here, we reported complete genome sequence of Bacillus sp. SJ-10, which has a single circular chromosome of 4,041,649 base pairs with a guanine-cytosine content of 46.39%. Bacillus sp. SJ-10 encodes a subunit of poly-γ-glutamic acid (γ-PGA) with a molecular weight of approximately 400 kDa, which contains four γ-PGA synthases (pgsB, pgsC, pgsAA and pgsE) and one γ-PGA-releasing gene (pgsS)...
June 21, 2018: Current Microbiology
Paula Simó-Mirabet, Erick Perera, Josep A Calduch-Giner, Juan M Afonso, Jaume Pérez-Sánchez
Sirtuins (SIRTs) represent a conserved protein family of deacetylases that act as master regulators of metabolism, but little is known about their roles in fish and livestock animals in general. The present study aimed to assess the value of SIRTs for the metabolic phenotyping of fish by assessing their co-expression with a wide-representation of markers of energy and lipid metabolism and intestinal function and health in two genetically different gilthead sea bream strains with differences in growth performance...
2018: Frontiers in Physiology
Christopher M Martinez, Matthew D McGee, Samuel R Borstein, Peter C Wainwright
The fish feeding apparatus is among the most diverse functional systems in vertebrates. While morphological and mechanical variation of feeding systems are well studied, we know far less about the diversity of the motions that they produce. We explored patterns of feeding movements in African cichlids from Lakes Malawi and Tanganyika, asking whether the degree of kinesis is associated with dietary habits of species. We used geometric morphometrics to measure feeding kinesis as trajectories of shape change, based on 326 high-speed videos in 56 species...
June 19, 2018: Evolution; International Journal of Organic Evolution
Min Xu, Shuji Sasa, Teruhisa Komatsu
Sargassum horneri C. Agardh is an important commercial edible seaweed species in east Asia. Benthic beds and floating rafts in coastal areas make excellent habitats for marine organisms to feed, hide, and spawn. Many commercially important fish species such as Japanese anchovy (Engraulis japonicus), yellowtail (Seriola quinqueradiata), and Japanese horse mackerel (Trachurus japonicus) live in seaweed beds. Chinese and Japanese fisherman rely on S. horneri beds as productive fish harvest areas. The Zhejiang government in China set a total allowable catch standard, to preserve the Ma'an Islands ecosystem, which is a marine protected area...
2018: PloS One
Manoj Kumar Das, M Rajesh Kumar Rao, A K Kulsreshtha
Background & objectives: Mosquitoes are responsible for transmitting several diseases, including malaria, dengue, chikungunya, filariasis, and yellow fever, etc. Release of larvivorous fishes is one of the cheapest method of vector management approach, with long suppression of mosquito population. The present study identifies the native larvivorous fishes and evaluates their potential larvivoracity for biological control of mosquito larvae in an endemic malarious region. Methods: During the year 2012-13, an ecological descriptive study was carried out in diverse aquatic habitats of fish species found in different areas of Ranchi district, in Jharkhand state of India...
January 2018: Journal of Vector Borne Diseases
Kristina M Mahan, Rosemary K Le, Tyrone Wells, Seth Anderson, Joshua S Yuan, Ryan J Stoklosa, Aditya Bhalla, David B Hodge, Arthur J Ragauskas
Livestock and fish farming are rapidly growing industries facing the simultaneous pressure of increasing production demands and limited protein required to produce feed. Bacteria that can convert low-value non-food waste streams into singe cell protein (SCP) present an intriguing route for rapid protein production. The oleaginous bacterium Rhodococcus opacus serves as a model organism for understanding microbial lipid production. SCP production has not been explored using an organism from this genus. In the present research, R...
June 18, 2018: Journal of Industrial Microbiology & Biotechnology
Kong Heng, Mathieu Chevalier, Sovan Lek, Pascal Laffaille
Tropical lakes and their associated floodplain habitats are dynamic habitat mosaics strongly influenced by seasonal variations in hydrologic conditions. In flood-pulse systems, water level oscillations directly influence the connectivity to floodplain habitats for fish. Here, we aimed to investigate whether seasonal changes in the water level of a flood-pulse system (the Tonle Sap Lake, Cambodia) differentially affect diet breadth and dietary overlap of three common and commercially important fish species (Anabas testudineus, Boesemania microplepis and Notopterus notopterus) presenting important differences in their life-cycle (e...
2018: PloS One
Matteo Zarantoniello, Leonardo Bruni, Basilio Randazzo, Arturo Vargas, Giorgia Gioacchini, Cristina Truzzi, Anna Annibaldi, Paola Riolo, Giuliana Parisi, Gloriana Cardinaletti, Francesca Tulli, Ike Olivotto
Due to minimal environmental impact, compared to most conventional feed commodities, insects deserve a growing attention as candidate ingredients for aquafeeds. This study tested, for the first time during zebrafish larval rearing, the effects of an increasing replacement (0%-25%-50%) of fish meal by black soldier fly (BSF) full-fat prepupae meal. All diets were formulated to be isonitrogenous and isolipidic. A multidisciplinary approach, including biometrics, histology, gas chromatography-mass spectrometry, and molecular analyses, was applied to better understand the biological responses of larval zebrafish to the different partial inclusions of BSF in the feed...
June 18, 2018: Zebrafish
Genciana Terova, Simona Rimoldi, Marisol Izquierdo, Cristina Pirrone, Wafa Ghrab, Giovanni Bernardini
Currently, the larviculture of many marine fish species with small-sized larvae depends for a short time after hatching, on the supply of high-quality live zooplankton to ensure high survival and growth rates. During the last few decades, the research community has made great efforts to develop artificial diets, which can completely substitute live prey. However, studies aimed at determining optimal levels of minerals in marine larvae compound feeds and the potential of novel delivery vectors for mineral acquisition has only very recently begun...
June 17, 2018: Fish Physiology and Biochemistry
Arjan P Palstra, Jeroen Kals, Ainhoa Blanco Garcia, Ron P Dirks, Marnix Poelman
Seaweeds may represent immuno-stimulants that could be used as health-promoting fish feed components. This study was performed to gain insights into the immunomodulatory effects of dietary seaweeds in Atlantic salmon. Specifically tested were 10% inclusion levels of Laminaria digitata (SW1) and a commercial blend of seaweeds (Oceanfeed® ) (SW2) against a fishmeal based control diet (FMC). Differences between groups were assessed in growth, feed conversion ratio and blood parameters hematocrit and hemoglobin...
2018: Frontiers in Physiology
Rafael P Leitão, Jansen Zuanon, David Mouillot, Cecília G Leal, Robert M Hughes, Philip R Kaufmann, Sébastien Villéger, Paulo S Pompeu, Daniele Kasper, Felipe R de Paula, Silvio F B Ferraz, Toby A Gardner
Agricultural land use is a primary driver of environmental impacts on streams. However, the causal processes that shape these impacts operate through multiple pathways and at several spatial scales. This complexity undermines the development of more effective management approaches, and illustrates the need for more in-depth studies to assess the mechanisms that determine changes in stream biodiversity. Here we present results of the most comprehensive multi-scale assessment of the biological condition of streams in the Amazon to date, examining functional responses of fish assemblages to land use...
January 1, 2018: Ecography
Naghmeh Jafari, Bahram Falahatkar, Mir Masoud Sajjadi
The effect of various feeding strategies was evaluated on growth performance and biochemical parameters in two sizes of Siberian sturgeon (465.75 ± 11.18 and 250.40 ± 12 g) during 45 days. Fish were distributed into six experimental treatments including large fish with satiation feeding (LA), small fish with satiation feeding (SA), large fish with 50% satiation feeding (LR), small fish with 50% satiation feeding (SR), large starved fish (LS), and small starved fish (SS). Differences in final weight between LA and LR treatments were not noticeable, whereas SA and SR treatments showed significant differences...
June 16, 2018: Fish Physiology and Biochemistry
Simona Bussotti, Antonio Di Franco, Carlo Nike Bianchi, Pierre Chevaldonné, Lea Egea, Emanuela Fanelli, Christophe Lejeusne, Luigi Musco, Carlos Navarro-Barranco, Alexis Pey, Serge Planes, Jean Vincent Vieux-Ingrassia, Paolo Guidetti
Dark marine habitats are often characterized by a food-limited condition. Peculiar dark habitats include marine caves, characterized by the absence of light and limited water flow, which lead to reduced fluxes of organic matter for cave-dwelling organisms. We investigated whether the most abundant and common cave-dwelling fish Apogon imberbis has the potential to play the role of trophic vector in Mediterranean marine caves. We first analysed stomach contents to check whether repletion changes according to a nycthemeral cycle...
June 15, 2018: Scientific Reports
Fatemeh Jafari, Naser Agh, Farzaneh Noori, Amir Tokmechi, Enric Gisbert
An eleven weeks feeding trial was conducted to determine the effects of different levels of dietary soybean lecithin (SBL) on growth performance, blood chemistry and immunity in juvenile stellate sturgeon (Acipenser stellatus). Fish were fed seven isoproteic (44% crude protein) and isolipidic (17% crude fat) diets containing graded levels of SBL: 0 (control), 1, 2, 4, 6, 8 and 10%. Results showed that dietary SBL supplementation significantly improved the final body weight (BW) and weight gain (WG). Fish fed 6% SBL showed the highest BW and WG values in comparison to fish fed the control diet (P < 0...
June 12, 2018: Fish & Shellfish Immunology
Chen Huang, Pei Wu, Wei-Dan Jiang, Yang Liu, Yun-Yun Zeng, Jun Jiang, Sheng-Yao Kuang, Ling Tang, Yong-An Zhang, Xiao-Qiu Zhou, Lin Feng
Deoxynivalenol (DON) is one of the most common mycotoxin contaminants of animal feed worldwide and brings significant threats to the animal production. However, studies concerning the effect of DON on fish intestine are scarce. This study explored the effects of DON on intestinal physical barrier in juvenile grass carp (Ctenopharyngodon idella). A total of 1440 juvenile grass carp (12.17 ± 0.01 g) were fed six diets containing graded levels of DON (27, 318, 636, 922, 1243 and 1515 μg/kg diet) for 60 days...
June 12, 2018: Fish & Shellfish Immunology
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