scholarly journals Indução a anestesia e recuperação de Betta splendens (Regan, 1910): uma proposta de utilização de um anestésico de baixo custo para uma espécie de peixe ornamental de grande apelo comercial

ScientiaTec ◽  
2020 ◽  
Vol 7 (03) ◽  
Author(s):  
Ângelo Cássio Magalhães Horn ◽  
Daniela Sanches Ilgenfritz ◽  
Pâmella Chavez Ortiz ◽  
Caroline Pavin Lacerda
Keyword(s):  

A manipulação sofrida por peixes destinados à comercialização gera um estado de estresse que favorece a contração de doenças e/ou a morte. Uma alternativa é a sedação/anestesia. Neste contexto, o óleo de cravo surge como uma alternativa promissora, pois induz a anestesia e propicia uma rápida recuperação. O objetivo do presente trabalho foi propor a concentração de óleo de cravo que melhor se adequa à indução da anestesia em Betta splendens e a sua recuperação. Para isto exemplares de B. splendens foram submetidos a soluções de óleo de cravo nas concentrações de 10, 25, 50, 75, 100 ou 150mg/L ou a uma solução de álcool etílico com concentração de 1.075mg/L. Os resultados demostraram não haver indução à anestesia quando utilizada a concentração de 10mg/L ou a exposição dos espécimes ao álcool etílico. Para outras concentrações de óleo de cravo percebeu-se uma redução na latência da anestesia com o aumento da concentração. O tempo de recuperação mostrou aumento quando concentrações de 25mg/L e 50mg/L foram comparadas. Conclui-se que a concentração de 25mg/L é a melhor escolha para a anestesia de B. splendens em razão de sua latência e do maior tempo para que o último estágio de anestesia seja alcançado.

Author(s):  
Le Wang ◽  
Fei Sun ◽  
Zi Yi Wan ◽  
Baoqing Ye ◽  
Yanfei Wen ◽  
...  

Abstract Resolving the genomic basis underlying phenotypic variations is a question of great importance in evolutionary biology. However, understanding how genotypes determine the phenotypes is still challenging. Centuries of artificial selective breeding for beauty and aggression resulted in a plethora of colors, long fin varieties, and hyper-aggressive behavior in the air-breathing Siamese fighting fish (Betta splendens), supplying an excellent system for studying the genomic basis of phenotypic variations. Combining whole genome sequencing, QTL mapping, genome-wide association studies and genome editing, we investigated the genomic basis of huge morphological variation in fins and striking differences in coloration in the fighting fish. Results revealed that the double tail, elephant ear, albino and fin spot mutants each were determined by single major-effect loci. The elephant ear phenotype was likely related to differential expression of a potassium ion channel gene, kcnh8. The albinotic phenotype was likely linked to a cis-regulatory element acting on the mitfa gene and the double tail mutant was suggested to be caused by a deletion in a zic1/zic4 co-enhancer. Our data highlight that major loci and cis-regulatory elements play important roles in bringing about phenotypic innovations and establish Bettas as new powerful model to study the genomic basis of evolved changes.


1966 ◽  
Vol 4 (7) ◽  
pp. 241-242 ◽  
Author(s):  
Ronald Baenninger

2019 ◽  
Vol 207 ◽  
pp. 34-42 ◽  
Author(s):  
Naim M. Bautista ◽  
Tanushri Pothini ◽  
Kelly Meng ◽  
Warren W. Burggren

2016 ◽  
Vol 76 (2) ◽  
pp. 292-299 ◽  
Author(s):  
L. H. Sipaúba-Tavares ◽  
A. M. Appoloni ◽  
J. B. K. Fernandes ◽  
R. N. Millan

Abstract The growth rate and percent survival of Betta splendens when submitted to formulated diet and live food treatments are evaluated. The three different diets were used and designated as: formulated diet (basal diet); live food diet (plankton) and mixed diet (formulated diet with plankton). The live food diet contained plankton belonging to an open pond. High mortality was reported with live food (plankton) treatment whereas higher percent survival occurred with formulated diet. Highest specific growth rate, weight gain and final weight were reported in the mixed diet treatment and were significantly different (p<0.01) from those in formulated diet and live food treatments. The gut contents of B. splendens in mixed diet and live food treatments comprised, Rotifera and Bacillariophyceae species in high percentages or rather, over 78% of total organisms. Lecane sp. was the most ingested zooplankton species by B. splendens in both treatments (mixed diet and live food), with the phytoplankton species Asterionella sp. and Melosira sp. respectively in mixed diet and in live food, respectively. Results indicated that the formulated diet influenced the water parameters dissolved oxygen, total suspended solids, total dissolved solids and pH. The live food in the open pond was not enough to improve the growth rate and percent survival of B. splendens. The growth performance of B. splendens; had the best results with mixed diet which was capable of maintaining species’s survival (82%) and development in artificial conditions, benefiting the culture management of ornamental fish.


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