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Article: Low cholesterol is not always good: low cholesterol levels are associated with decreased serotonin and increased aggression in fish.

Aguiar, Ariane / Giaquinto, Percília Cardoso

2018 Volume 7, Issue 12

Abstract: The inverse relationship between serum cholesterol and levels of aggression led to the cholesterol-serotonin hypothesis. According to this hypothesis, low dietary cholesterol intake leads to depressed central serotonergic activity, which is associated ... ...

Abstract	The inverse relationship between serum cholesterol and levels of aggression led to the cholesterol-serotonin hypothesis. According to this hypothesis, low dietary cholesterol intake leads to depressed central serotonergic activity, which is associated with increased aggression. Here we present the hypothesis about the evolutionary origins of low cholesterol and aggressive behavior, investigating the relationship between low levels of plasma cholesterol and aggressive behavior in fish. We used Nile tilapia (
Language	English
Publishing date	2018-12-10
Publishing country	England
Document type	Journal Article
ZDB-ID	2632264-X
ISSN	2046-6390
ISSN	2046-6390
DOI	10.1242/bio.030981
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Differences in the Alcohol Preference Assessment of Shy and Bold Zebrafish.

Bellot, Marina Sanson / Guermandi, Isabela Inforzato / Camargo-Dos-Santos, Bruno / Giaquinto, Percília Cardoso

Frontiers in behavioral neuroscience

2022 Volume 16, Page(s) 810051

Abstract: Individuals differ in their preference for alcohol and propensity to develop alcoholism, where the behavioral profile, such as the bold-shy axis, plays an important role for such a difference. However, literature is limited and conflicting on the causes ... ...

Abstract	Individuals differ in their preference for alcohol and propensity to develop alcoholism, where the behavioral profile, such as the bold-shy axis, plays an important role for such a difference. However, literature is limited and conflicting on the causes and consequences of this relationship. Translational studies using animal models, such as zebrafish, can help identify behavioral traits that predispose individuals to drink alcohol compulsively. Here, the preference for alcohol was investigated in two distinct traits in zebrafish: shy and bold. For this purpose, fish were separated into shy and bold traits and then a conditioned place preference paradigm was used, a strategy that allows the rewarding effects from alcohol to be assessed by the ability to enhance the animal's preference for an environment that initially was not preferred. It was found that bold zebrafish actively searched for the environment that was paired to alcohol after one acute exposure, whereas, shy fish changed their place preference even without alcohol administration, showing that the conditioned place preference protocol, given the short amount time to assess place preference, is not ample enough for shy fish to choose. Our results show that behavioral profiles must be considered in further studies since differences between shy and bold individuals on preference behavior can strongly interfere in the assessment of drug preference, mainly when using the conditioned place preference paradigm.
Language	English
Publishing date	2022-02-24
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2452960-6
ISSN	1662-5153
ISSN	1662-5153
DOI	10.3389/fnbeh.2022.810051
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Article: The attraction trick: males in early stages of disease become more chemically attractive to Nile tilapia (Oreochromis niloticus) females

Rossi, Vanessa Stramantinoli / de Mello, Isabela Maria / Barki, Assaf / Giaquinto, Percilia Cardoso

Journal of fish biology. 2021 Nov., v. 99, no. 5

2021

Abstract: In aquatic systems, olfaction plays an important role in acquiring information about the social environment and influences important behaviours in various contexts, including predator avoidance, foraging, aggressive and reproductive behaviour and mate ... ...

Abstract	In aquatic systems, olfaction plays an important role in acquiring information about the social environment and influences important behaviours in various contexts, including predator avoidance, foraging, aggressive and reproductive behaviour and mate selection. As the presence of diseases might modify individual odour, fish may use the variability in conspecifics’ odours as an indicator of the health status and infectious load of potential mates. Here, female Nile tilapia were tested for their ability to detect infected males and discriminate between bacterial infected and uninfected individuals by means of chemical cues. Females were allowed to choose between the odours of males infected by Aeromonas hydrophila bacteria and uninfected males. The findings show that female Nile tilapia initially showed a preference for infected males in terms of their first choice in a dichotomous choice test, but the total duration of time spent with the stimulus from infected males was not longer than that for the uninfected males. This may indicate that males at early stages of infection, i.e., without advanced clinical signs of infection, emit odours that allow them to enjoy the benefits of socialization when the infection is not yet detected by conspecifics. Thus, in the context of reproduction, males might attract female partners and have some chance of reproducing, before being avoided.
Keywords	Aeromonas hydrophila ; Oreochromis niloticus ; females ; fish ; health status ; mating behavior ; odors ; predator avoidance ; reproduction ; reproductive behavior ; smell ; social environment
Language	English
Dates of publication	2021-11
Size	p. 1632-1639.
Publishing place	Blackwell Publishing Ltd
Document type	Article
Note	JOURNAL ARTICLE
ZDB-ID	410564-3
ISSN	1095-8649 ; 0022-1112
ISSN (online)	1095-8649
ISSN	0022-1112
DOI	10.1111/jfb.14870
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: The attraction trick: males in early stages of disease become more chemically attractive to Nile tilapia (Oreochromis niloticus) females.

Rossi, Vanessa Stramantinoli / de Mello, Isabela Maria / Barki, Assaf / Giaquinto, Percilia Cardoso

Journal of fish biology

2021 Volume 99, Issue 5, Page(s) 1632–1639

Abstract	In aquatic systems, olfaction plays an important role in acquiring information about the social environment and influences important behaviours in various contexts, including predator avoidance, foraging, aggressive and reproductive behaviour and mate selection. As the presence of diseases might modify individual odour, fish may use the variability in conspecifics' odours as an indicator of the health status and infectious load of potential mates. Here, female Nile tilapia were tested for their ability to detect infected males and discriminate between bacterial infected and uninfected individuals by means of chemical cues. Females were allowed to choose between the odours of males infected by Aeromonas hydrophila bacteria and uninfected males. The findings show that female Nile tilapia initially showed a preference for infected males in terms of their first choice in a dichotomous choice test, but the total duration of time spent with the stimulus from infected males was not longer than that for the uninfected males. This may indicate that males at early stages of infection, i.e., without advanced clinical signs of infection, emit odours that allow them to enjoy the benefits of socialization when the infection is not yet detected by conspecifics. Thus, in the context of reproduction, males might attract female partners and have some chance of reproducing, before being avoided.
MeSH term(s)	Aeromonas hydrophila ; Animals ; Cichlids ; Female ; Fish Diseases ; Gram-Negative Bacterial Infections ; Male ; Reproduction
Language	English
Publishing date	2021-08-19
Publishing country	England
Document type	Journal Article
ZDB-ID	410564-3
ISSN	1095-8649 ; 0022-1112
ISSN (online)	1095-8649
ISSN	0022-1112
DOI	10.1111/jfb.14870
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Welfare in Nile Tilapia Production: Dorsal Fin Erection as a Visual Indicator for Insensibility.

Camargo-Dos-Santos, Bruno / Carlos, Clarissa Lerois / Favero-Neto, João / Alves, Nina Pacheco Capelini / Gonçalves, Bruno Bastos / Giaquinto, Percília Cardoso

Animals : an open access journal from MDPI

2021 Volume 11, Issue 10

Abstract: In aquaculture, to ensure animal welfare in pre-slaughter and slaughter stages, it is fundamental that fish are insensible. A method for evaluating fish insensibility is based on visual sensibility indicators (VSI) assessment (i.e., self-initiated ... ...

Abstract	In aquaculture, to ensure animal welfare in pre-slaughter and slaughter stages, it is fundamental that fish are insensible. A method for evaluating fish insensibility is based on visual sensibility indicators (VSI) assessment (i.e., self-initiated behavior, responses to stimuli and reflexes). However, many stimuli used to assess fish responses are painful. Therefore, this study verifies whether the presence/absence of a dorsal fin erection (DFE) response can be used as a painless VSI in Nile tilapia (
Language	English
Publishing date	2021-10-19
Publishing country	Switzerland
Document type	Journal Article
ISSN	2076-2615
ISSN	2076-2615
DOI	10.3390/ani11103007
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Article: Welfare in Nile Tilapia Production: Dorsal Fin Erection as a Visual Indicator for Insensibility

Camargo-dos-Santos, Bruno / Carlos, Clarissa Lerois / Favero-Neto, João / Alves, Nina Pacheco Capelini / Gonçalves, Bruno Bastos / Giaquinto, Percília Cardoso

Animals. 2021 Oct. 19, v. 11, no. 10

2021

Abstract	In aquaculture, to ensure animal welfare in pre-slaughter and slaughter stages, it is fundamental that fish are insensible. A method for evaluating fish insensibility is based on visual sensibility indicators (VSI) assessment (i.e., self-initiated behavior, responses to stimuli and reflexes). However, many stimuli used to assess fish responses are painful. Therefore, this study verifies whether the presence/absence of a dorsal fin erection (DFE) response can be used as a painless VSI in Nile tilapia (Oreochromis niloticus). Three stunning protocols were applied to fish: benzocaine anesthesia (40 mg/L and 80 mg/L), ice water immersion (0–1, 2–3 and 5–6 °C) and CO₂ stunning. After these stunning methods were applied in fish, the time of loss and return of DFE was observed, along with the vestibulo-ocular reflex (VOR). All fish stunned using benzocaine and ice water immersion lose both VSIs, while 95% of fish stunned using CO₂ lose these VSIs. In all treatments, DFEs return quicker than VOR. Therefore, DFE can be used as a VSI in Nile tilapia, which is simple for producers to assess and does not require a painful stimulus. However, the DFE alone does not totally ensure fish insensibility and must be used together with other well-established VSIs at fish farms.
Keywords	Oreochromis niloticus ; anesthesia ; animal welfare ; aquaculture ; benzocaine ; carbon dioxide ; fins ; fish ; fish production ; ice ; slaughter
Language	English
Dates of publication	2021-1019
Publishing place	Multidisciplinary Digital Publishing Institute
Document type	Article
ZDB-ID	2606558-7
ISSN	2076-2615
ISSN	2076-2615
DOI	10.3390/ani11103007
Database	NAL-Catalogue (AGRICOLA)

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Article: Effects of clove oil on behavioral reactivity and motivation in Nile tilapia

da Silva, Dneson Ricardo / Arvigo, Alexandre Luiz / Giaquinto, Percília Cardoso / Delicio, Helton Carlos / Barcellos, Leonardo José Gil / Barreto, Rodrigo Egydio

Aquaculture. 2021 Feb. 15, v. 532

2021

Abstract: Essential oils have been used as potential substitutes for synthetic anesthetics in aquaculture. In this context, the oil extracted from parts of the clove plant (Eugenia caryophyllata) has been used as anesthetic. This oil has been considered effective, ...

Abstract	Essential oils have been used as potential substitutes for synthetic anesthetics in aquaculture. In this context, the oil extracted from parts of the clove plant (Eugenia caryophyllata) has been used as anesthetic. This oil has been considered effective, since induces anesthesia quickly, reflex recovery is brief and has low mortality rate. However, it is unknown whether there are changes in stimuli reactivity and behavioral motivational in fish after anesthesia recovery. As the effects of anesthetics are on the central nervous system, it is plausible to assume such possibilities. Here we tested this hypothesis using Nile tilapia, a relevant species for aquaculture. Operationally, we measured elements of feeding and aggressive behaviors to infer effects on reactivity to stimuli and motivation. For this, using the bath exposure technique, we submitted the fish to 3 different conditions: 1) negative control (without anesthetic) and two alcoholic solutions of clove oil diluted in water 2) 50 mg/l and 3) 100 mg/l. Tilapia were anesthetized by bathe exposure into buckets until reach the classic stage II of anesthesia. After, they were introduced into test aquaria (1 fish per aquarium) for future observations. Control fish (0 mg/L) were exposed to the same procedures and remained into the buckets until the longest period for one of the fish in the batch to reach stage II of anesthesia. Tilapia were kept in the aquaria for 4 consecutive days and, while the feeding behavior was evaluated daily, the aggressive behavior was evaluated on the second and fourth days. Here, we provide evidences that clove oil did not affect reactivity to stimuli and motivation regarding these evaluated behaviors. Thus, we reinforce the safe use of clove oil in aquaculture practices that require anesthesia in fish.
Keywords	Oreochromis niloticus ; Syzygium aromaticum ; aggression ; anesthesia ; anesthetics ; aquaculture ; aquariums ; buckets ; central nervous system ; clove oil ; cloves ; feeding behavior ; fish ; mortality ; motivation ; oils
Language	English
Dates of publication	2021-0215
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	185380-6
ISSN	0044-8486 ; 0044-8516
ISSN	0044-8486 ; 0044-8516
DOI	10.1016/j.aquaculture.2020.736045
Database	NAL-Catalogue (AGRICOLA)

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Article: The effects of tryptophan supplementation on stress and aggression in Nile tilapia

Vieira, Bruna Renata Meletti / Guermandi, Isabela Inforzato / Bellot, Marina Sanson / Camargo‐dos‐Santos, Bruno / Favero‐Neto, João / Giaquinto, Percília Cardoso

Journal of applied ichthyology. 2021 Aug., v. 37, no. 4

2021

Abstract: Nile tilapia farmers must deal with production challenges, such as increased aggressiveness and high stress levels, which potentially diminishes fish welfare. Tryptophan supplementation is a strategy to cope with such problems. However, data is scarce on ...

Abstract	Nile tilapia farmers must deal with production challenges, such as increased aggressiveness and high stress levels, which potentially diminishes fish welfare. Tryptophan supplementation is a strategy to cope with such problems. However, data is scarce on how tryptophan affects the aggressiveness of this species and other aspects need to be understood on how it influences stress in fish. In this study, we investigate how a 1× (0.32%), 4× (1.28%) and 8× (2.56%) supplemented tryptophan diet affects aggressiveness and stress in Nile tilapia. Aggressiveness in fish was assessed after short‐term exposure (7 days) to a tryptophan supplemented diet while stress in fish was assessed after long‐term exposure (60 days). The 4x and 8x diets reduced aggressiveness in fish, while the 8x diet reduced aggressiveness more effectively than the 4x diet. Also, long‐term exposure to the 8x diet reduced stress in fish, before and after they were exposed to an acute stress. In conclusion, this study showed that a tryptophan supplemented diet can diminish aggressiveness and stress in Nile tilapia, thus demonstrating a potential to improve fish welfare.
Keywords	Oreochromis niloticus ; acute exposure ; animal welfare ; chronic exposure ; diet ; fish ; ichthyology ; tryptophan
Language	English
Dates of publication	2021-08
Size	p. 578-584.
Publishing place	John Wiley & Sons, Ltd
Document type	Article
Note	JOURNAL ARTICLE
ZDB-ID	283875-8
ISSN	0175-8659
ISSN	0175-8659
DOI	10.1111/jai.14186
Database	NAL-Catalogue (AGRICOLA)

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Article: The impact of catch-and-release on feeding responses and aggressive behavior in Nile tilapia (Oreochromis niloticus)

Camargo-dos-Santos, Bruno / Rossi, Vanessa Stramantinoli / Gonçalves, Bruno Bastos / Leutz, Juliane de Abreu Campos Machado / Giaquinto, Percilia Cardoso / Sabbadin Zanuzzo, Fábio

Marine and freshwater behaviour and physiology. 2021 May 04, v. 54, no. 3

2021

Abstract: Catch-and-Release (C&R) practice may result in post-release mortality in fish. Therefore, most C&R studies have focused on endangered or highly valued target species, and less attention has been given to introduced/abundant species, which indeed are ... ...

Abstract	Catch-and-Release (C&R) practice may result in post-release mortality in fish. Therefore, most C&R studies have focused on endangered or highly valued target species, and less attention has been given to introduced/abundant species, which indeed are important from an ecological point of view. Nile tilapia is considered an introduced species in many areas and is a commonly caught species in recreational fisheries; therefore, understanding the impacts of C&R on tilapia is also important from an animal welfare perspective. We investigated whether C&R impacts the aggressive behavior and feeding responses of Nile tilapia, characteristics that impair the welfare and the ability of an individual to have success in its ecosystem. Surprisingly, C&R did not affect these responses, and our results suggest that Nile tilapia may be relatively more resilient to C&R, and that C&R practices may act as an additional selective force towards the ecological success of Nile tilapia as introduced species.
Keywords	Oreochromis niloticus ; aggression ; animal welfare ; ecosystems ; fish ; freshwater ; introduced species ; mortality ; physiology
Language	English
Dates of publication	2021-0504
Size	p. 133-148.
Publishing place	Taylor & Francis
Document type	Article
ZDB-ID	2029547-9
ISSN	1029-0362 ; 1023-6244
ISSN (online)	1029-0362
ISSN	1023-6244
DOI	10.1080/10236244.2021.1953380
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Cannabidiol improves Nile tilapia cichlid fish welfare.

Camargo-Dos-Santos, Bruno / Bellot, Marina Sanson / Guermandi, Isabela Inforzato / Favero-Neto, João / da Silva Rodrigues, Maira / da Costa, Daniel Fernandes / Nóbrega, Rafael Henrique / Filev, Renato / Gonçalves-de-Freitas, Eliane / Giaquinto, Percília Cardoso

Scientific reports

2022 Volume 12, Issue 1, Page(s) 17650

Abstract: Cannabidiol (CBD) is a substance derived from Cannabis sativa, widely studied in medicine for controlling neural diseases in humans. Besides the positive effects on humans, it also presents anxiolytic proprieties and decreases aggressiveness and stress ... ...

Abstract	Cannabidiol (CBD) is a substance derived from Cannabis sativa, widely studied in medicine for controlling neural diseases in humans. Besides the positive effects on humans, it also presents anxiolytic proprieties and decreases aggressiveness and stress in mammals. Therefore, CBD has the potential to increase welfare in reared animals, as it seems to reduce negative states commonly experienced in artificial environments. Here, we tested the effect of different CBD doses (0, 1, 10 and 20 mg/kg) on aggressiveness, stress and reproductive development of the Nile tilapia (Oreochromis niloticus) a fish reared worldwide for farming and research purposes. CBD mixed with fish food was offered to isolated fish for 5 weeks. The 10 mg/kg dose decreased fish's aggressiveness over time, whereas 20 mg/kg attenuated non-social stress. Both doses decreased the baseline cortisol level of fish and increased the gonadosomatic index. However, CBD 1 and 10 mg/kg doses decreased the spermatozoa number. No CBD dose affected feeding ingestion and growth variables, showing that it is not harmful to meat production amount. Despite the effect on spermatozoa, CBD supplementation exhibits high potential to benefit animals' lives in artificial environments. Therefore, we showed for the first time that CBD could be used as a tool to increase non-mammal welfare, presenting a great potential to be explored in other husbandry and captivity species.
MeSH term(s)	Humans ; Male ; Animals ; Cichlids ; Cannabidiol/pharmacology ; Anti-Anxiety Agents ; Hydrocortisone ; Cannabis ; Mammals
Chemical Substances	Cannabidiol (19GBJ60SN5) ; Anti-Anxiety Agents ; Hydrocortisone (WI4X0X7BPJ)
Language	English
Publishing date	2022-10-21
Publishing country	England
Document type	Journal Article
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-022-21759-3
Database	MEDical Literature Analysis and Retrieval System OnLINE

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