Mixed Chromatophoroma (benign irido‐melanocytoma) in a male Siamese fighting fish, <i>Betta splendens</i>, Regan

Shivley, Jacob M; Brookshire, W. Cooper; Baumgartner, Wes

doi:10.1111/jfd.13303

Cited by 8 publications

(6 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Specifically, in males, a slightly dark region was observed in the epithelium of the lower jaw (Figure 2B Bright field). Since iridophores have birefringent properties under polarized illumination 21,22 , we observed tissue sections under polarized illumination. The dark region observed in the bright field was bright white-green under polarized illumination (Figure 2B, The observed region is illustrated in Figure S3).…”

Section: Male Spotnape Cardinalfish Have Whiter Lower Jawsmentioning

confidence: 99%

Inconspicuous breeding coloration to conceal eggs during mouthbrooding in male cardinalfish

Ishihara,

Kanda

2024

Preprint

View full text Add to dashboard Cite

The body coloration of animals has various functions, such as camouflage coloration for hiding their existence from other organisms and conspicuous coloration for appealing to their potential mates. Since the breeding colorations of males are widely considered to attract females, most previous studies on breeding coloration have mostly focused on conspicuous breeding coloration, which may have prevented the discovery of possible functions other than appealing. Here, based on a speculation that such breeding coloration might occur in species with weak sexual selection in males, we focused on Apogoninae whose sex role is considered to be reversed due to their characteristic parental behavior, paternal mouthbrooding. Through detailed morphological observations, we found that males exhibit non-conspicuous white structures, consisting of iridophores, in the lower jaw during the breeding season. Artificial implantation of eggs inside the mouth in both sexes showed that the white structure in the lower jaws, which specifically exists in males, drastically reduces the visibility of eggs during mouthbrooding. This suggested that this coloration may serve to conceal the conspicuous coloration of eggs during mouthbrooding. In addition, in vivo and in vitro hormone treatment experiments revealed that iridophore development in the lower jaw is induced by androgen through the Alkal-Ltk pathway. These results suggest that androgen-dependent breeding colorations in males, which have been considered to attract females, may serve the opposite function in these species, "inconspicuous coloration", to increase the fitness of their specialized behavior, mouthbrooding.

show abstract

Section: Male Spotnape Cardinalfish Have Whiter Lower Jawsmentioning

confidence: 99%

Inconspicuous breeding coloration to conceal eggs during mouthbrooding in male cardinalfish

Ishihara,

Kanda

2024

Preprint

View full text Add to dashboard Cite

show abstract

“…Todos esses achados permitiram a conclusão do diagnóstico de melanoma maligno. As neoplasias em peixes ainda não são completamente entendidas, acredita-se se que a etiologia seja semelhante à das neoplasias em mamíferos podendo estar associada a infecções virais, agentes químicos, físicos e hormonais (SHIVLEY et al, 2021). Fatores ambientais como a poluição aquática tem sido incriminado com causador de neoplasias em peixes de vida livre (ROMANO; PEDROSA, 2020).…”

Section: Relato De Casounclassified

“…Outro fator que influenciou na escolha do propofol como parte do protocolo anestésico desse peixe foi a alta disponibilidade do produto que é facilmente encontrado no mercado brasileiro e amplamente utilizado para anestesia de pequenos e grandes animais. O mecanismo de ação do propofol é por modulação positiva, agonista no receptor GABA A, com função inibitória sob o neurotransmissor ácido gama-aminobutírico, causando perda de consciência, uma vez que estes receptores se localizam no sistema nervoso central (TRAPANI et al, 2000).…”

Section: Relato De Casounclassified

See 1 more Smart Citation

Melanoma maligno em peixe beta “Betta splendens”: relato de caso

Garcia Lopes,

Alves Bartolomeu,

Neves Teodoro

et al. 2023

PRW

View full text Add to dashboard Cite

As neoplasias em peixes são pouco conhecidas, mas sabe-se que esses animais manifestam tumores muito semelhantes aos que afetam os mamíferos. A etiologia varia entre fatores físicos, químicos, ambientais, virais, biológicos e hormonais, e frequentemente está relacionada à poluição aquática. O objetivo do trabalho foi descrever um caso atípico de melanoma maligno em peixe beta. Um indivíduo da espécie “Beta splendens” macho, foi atendido com uma massa irregular de crescimento rápido e progressivo, na região caudodorsal ao olho direito. Para o diagnóstico foi realizada biópsia e amostras foram enviadas para cultura bacteriana e fúngica e para exame histopatológico. O peixe foi anestesiado em imersão com propofol e cetamina, a massa foi excisada e o peixe alocado em um aquário destinado a recuperação anestésica. Minutos depois o animal veio a óbito. Não houve crescimento em ambas as culturas. Os achados microscópicos mostraram proliferação neoplásica mesenquimal com células neoplásicas infiltradas na musculatura adjacente e guelras, levando ao diagnóstico de melanoma maligno. Conclui-se que o melanoma deve ser incluído na lista de diagnósticos diferenciais para nódulo cutâneo em peixes.

show abstract

“…The high prevalence of tumours in bettas is common knowledge among fanciers. There are more reports of neoplasia than any other betta health problem in the scientific literature, including a primary chromatophoroma, mixed chromatophoroma (irido‐melanocytoma), malignant iridophoroma and melanoma/angiolipoma (Ciambrone et al., 2019; Rahmati‐Holasoo et al., 2015; Rahmati‐Holasoo et al., 2019; Shivley et al., 2020). All these tumours were pigment‐cell based.…”

Section: Clinical Relevancementioning

confidence: 99%

Pigmentary keratitis and mixed chromatophoroma in a betta fish (Betta splendens)

McLaughlin

Emanuele

Hadfield

et al. 2022

Aquaculture Fish & Fisheries

View full text Add to dashboard Cite

Betta fish (Betta splendens) are common pets selectively bred for many different anatomic morphologies and colourations. Fish fanciers on hobbyist forums have linked certain phenotypic traits to the development of eye disease and neoplasia in this species. An 8-month-old male giant koi dragonscale plakat betta fish presented for ocular abnormalities and a mass on the tail. Clinical signs continued to progress, and the patient was euthanized due to declining quality of life 10 weeks after initial presentation. Pigmentary keratitis, anterior uveitis, and a mixed chromatophoroma were identified histologically. A review of the anecdotal and available scientific literature revealed that both the neoplastic disease and ocular disease may have had a genetic cause in this particular colour morph. Genetic disease should remain a differential for the cause of ocular and skin pathology in bettas. Combining genetic lines of fish may result in the development of multiple health problems, and ethical fish breeders should select away from characteristics that decrease lifespan and affect quality of life.

show abstract

Mixed Chromatophoroma (benign irido‐melanocytoma) in a male Siamese fighting fish, Betta splendens, Regan

Cited by 8 publications

References 22 publications

Inconspicuous breeding coloration to conceal eggs during mouthbrooding in male cardinalfish

Inconspicuous breeding coloration to conceal eggs during mouthbrooding in male cardinalfish

Melanoma maligno em peixe beta “Betta splendens”: relato de caso

Pigmentary keratitis and mixed chromatophoroma in a betta fish (Betta splendens)

Contact Info

Product

Resources

About