Effect of the combination of a cold water temperature and exogenous estrogens on feminization, growth, gonadosomatic index and fat muscle content of Nile tilapia Oreochromis niloticus (Linnaeus, 1758)

Lazaro-Velasco, Angel; Isidro-Cristobal, Helsi M.; Alcántar‐Vázquez, Juan Pablo; Antonio-Estrada, Carolina; Calzada-Ruiz, Daniel; Torre, Raúl Moreno-de la

doi:10.3856/vol47-issue1-fulltext-7

Cited by 7 publications

(3 citation statements)

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“…Although the duration of hormonal treatment has been pointed out as an important factor to successfully induce high rates of sex reversal, in recent years, both feminization and masculinization experiments with Nile tilapia, have shown that it is not necessary to administer the hormone for more than 20 days after the onset of the labile period to induce high rates of sex reversal [12,42,43,44]. Nakamura and coauthors [45] reports that under the light microscope, the first signs of gonadal sex differentiation appear in Nile tilapia fry at 23-26 days after hatching with the formation of the ovarian cavity in the XX gonad or the efferent duct in the XY gonad.…”

Section: Discussionmentioning

confidence: 99%

Effect of Fluoxymesterone on Sex Proportion and Growth Performance of Nile Tilapia (Oreochromis niloticus L.).

Ramírez-Ochoa

Moreno-Fernández

Juárez-Barrientos

et al. 2023

Braz. arch. biol. technol.

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One of the main problems to be solved in the commercial production of Nile tilapia is the use of large volumes of steroids during the sex reversion process. The precise evaluation of the time after hatching to start the steroid treatment could help reduce its use in the short-term. The main objective of this work was to evaluate the sex proportion and the growth obtained in a mixed population of Nile tilapia fed fluoxymesterone at different days (3, 6, 9, 12, and 15) after hatching. A one-factor experiment was designed, with the day, after hatching, that the fluoxymesterone (5 mg) began to be supplied as factor (3, 6, 9, 12 and 15). Initial stocking density was 0.4 larvae L -1 . All groups were evaluated by triplicate. Steroid treatment finished at day 25 after larvae stocking. Squash technique was used to determine sex proportion at the end of the experiment (45 days). Growth evaluation was performed based on wet weight and total length obtained from each biometry. The results showed the highest percentage of males (92%) in the fish fed fluoxymesterone from day three after hatching. No anabolic effect on growth was observed in any steroidtreated fish. A negative effect on growth was observed after withdrawal of the steroid in the fish that were fed fluoxymesterone for the longest time. These results show that it is necessary to supply the fluoxymesterone prior to the onset of sex differentiation (5-6 days after hatching) to achieve a permanent reversion of the sex differentiation process.

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Section: Discussionmentioning

confidence: 99%

Effect of Fluoxymesterone on Sex Proportion and Growth Performance of Nile Tilapia (Oreochromis niloticus L.).

Ramírez-Ochoa

Moreno-Fernández

Juárez-Barrientos

et al. 2023

Braz. arch. biol. technol.

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“…In studies performed by Lazaro-Velasco et al [ 100 ], the combined effect of a low temperature of water with E2, EE2 and diethylstilbestrol on Nile tilapia has been researched. Fishes were exposed to estrogens through feed addition (120 mg/kg).…”

Section: Impact On Metabolismmentioning

confidence: 99%

Estrogen Receptors Mediated Negative Effects of Estrogens and Xenoestrogens in Teleost Fishes—Review

Wojnarowski

Cholewińska

Palić

et al. 2022

IJMS

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Estrogen receptors (ERs) play a key role in many biochemical and physiological processes, that are involved in maintaining organism homeostasis. At the most basic level, they can be divided into nuclear estrogen receptors and membrane estrogen receptors that imply their effect in two ways: slower genomic, and faster non-genomic. In these ways, estrogens and xenoestrogens can negatively affect animal health and welfare. Most of the available literature focuses on human and mammalian physiology, and clearly, we can observe a need for further research focusing on complex mutual interactions between different estrogens and xenoestrogens in aquatic animals, primarily fishes. Understanding the mechanisms of action of estrogenic compounds on the ERs in fishes and their negative consequences, may improve efforts in environmental protection of these animals and their environment and benefit society in return. In this review, we have summarized the ER-mediated effects of xenoestrogens and estrogens on teleost fishes metabolism, their carcinogenic potential, immune, circulatory, and reproductive systems.

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“…Selanjutnya, bobot ikan, tingkat evakuasi lambung, feminisasi dan maskulinisasi gonad juga dipengaruhi oleh suhu (Velasco et al, 2019). Suhu ini berpengaruh terhadap bobot ikan Nila, dimana ketika suhu optimal maka keberlangsungan metabolisme tubuh ikan Nila juga optimal sehingga bobot ikan Nila juga meningkat (Jin et al, 2019).…”

Section: Hasil Dan Pembahasanunclassified

Studi Literatur : Pengaruh Suhu terhadap Ikan Nila (Oreochromis niloticus)

Cahyanti,

Awalina

2022

Panthera j. ilm. pendidik. Sains dan terap.

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Tilapia is one example of fish that is successfully cultivated in the world. Tilapia can live in deep and wide waters as well as in narrow and shallow ponds, and can live in rivers. The main environmental and management factors that affect the survival and growth of fish are dissolved oxygen levels, temperature, pH, feeding rate, and others. This study aims to determine the effect of temperature on tilapia (Orechromis niloticus). The method used in this research is a literature study (systematic review) by analyzing several scientific articles that are relevant to the study being discussed. The results of this study are known that temperature is very influential on several aspects of life, namely the level of survival, appetite, level of stability of the body for disease, growth rate, fish movement, viscosity and blood flow, oxygen consumption, leukocyte count, glucose level. in the blood, the number of erythrocytes, the number of platelets, the reaction of changing ammonium to ammonia, seed maintenance, tilapia weight, spermatogenesis stage in male individuals, hemoglobin concentration, feminization and masculinization of gonads, gastric evacuation rate, number of egg production, swimming speed, metabolic rate, response to feeding, the level of infertility in female fish, tilapia seed weight, fish stress level, the mechanism for determining the number of sex ratios, ovarian structure, and testicular structure. The conclusion of this study is that temperature greatly influences the life of tilapia (Oreochromis niloticus).

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Effect of the combination of a cold water temperature and exogenous estrogens on feminization, growth, gonadosomatic index and fat muscle content of Nile tilapia Oreochromis niloticus (Linnaeus, 1758)

Cited by 7 publications

References 0 publications

Effect of Fluoxymesterone on Sex Proportion and Growth Performance of Nile Tilapia (Oreochromis niloticus L.).

Effect of Fluoxymesterone on Sex Proportion and Growth Performance of Nile Tilapia (Oreochromis niloticus L.).

Estrogen Receptors Mediated Negative Effects of Estrogens and Xenoestrogens in Teleost Fishes—Review

Studi Literatur : Pengaruh Suhu terhadap Ikan Nila (Oreochromis niloticus)

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