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Ye Z, Elaswad A, Su B, Alsaqufi A, Shang M, Bugg WS, Qin G, Drescher D, Li H, Qin Z, Odin R, Makhubu N, Abass N, Dong S, Dunham R. Reversible Sterilization of Channel Catfish via Overexpression of Glutamic Acid Decarboxylase Gene. Animals (Basel) 2024; 14:1899. [PMID: 38998011 PMCID: PMC11240427 DOI: 10.3390/ani14131899] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2024] [Revised: 06/14/2024] [Accepted: 06/24/2024] [Indexed: 07/14/2024] Open
Abstract
The confinement of transgenic fish is essential to prevent their escape and reproduction in natural ecosystems. Reversible transgenic sterilization is a promising approach to control the reproduction of transgenic fish. Therefore, the present study was conducted to develop a reversibly sterile channel catfish (Ictalurus punctatus) via the transgenic overexpression of the goldfish (Carassius auratus) glutamic acid decarboxylase (GAD) gene driven by the common carp (Cyprinus carpio) β-actin promoter to disrupt normal gamma-aminobutyric acid (GABA) regulation. Three generations of GAD-transgenic fish were produced. All studied generations showed repressed reproductive performance; however, this was not always statistically significant. In F1, 5.4% of the transgenic fish showed a sexual maturity score ≥ 4 (maximum = 5) at five years of age, which was lower (p = 0.07) than that of the control group (16.8%). In the spawning experiments conducted on F1 transgenic fish at six and nine years of age, 45.5% and 20.0% of fish spawned naturally, representing lower values (p = 0.09 and 0.12, respectively) than the percentages in the sibling control fish of the same age (83.3% and 66.7%, respectively). Four of six pairs of the putative infertile six-year-old fish spawned successfully after luteinizing hormone-releasing hormone analog (LHRHa) therapy. Similar outcomes were noted in the three-year-old F2 fish, with a lower spawning percentage in transgenic fish (20.0%) than in the control (66.7%). In one-year-old F2-generation transgenic fish, the observed mean serum gonadotropin-releasing hormone (GnRH) levels were 9.23 ± 2.49 and 8.14 ± 2.21 ng/mL for the females and males, respectively. In the control fish, the mean levels of GnRH were 11.04 ± 4.06 and 9.03 ± 2.36 ng/mL for the females and males, respectively, which did not differ significantly from the control (p = 0.15 and 0.27 for females and males, respectively). There was no significant difference in the estradiol levels of the female transgenic and non-transgenic fish in the one- and four-year-old F2-generation fish. The four-year-old F2-generation male transgenic fish exhibited significantly (p < 0.05) lower levels of GnRH and testosterone than the control fish. In conclusion, while overexpressing GAD repressed the reproductive abilities of channel catfish, it did not completely sterilize transgenic fish. The sterilization rate might be improved through selection in future generations.
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Affiliation(s)
- Zhi Ye
- School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA; (A.E.); (B.S.); (A.A.); (M.S.); (W.S.B.); (G.Q.); (D.D.); (H.L.); (Z.Q.); (R.O.); (N.M.); (N.A.); (S.D.); (R.D.)
- Key Laboratory of Tropical Aquatic Germplasm of Hainan Province, Sanya Oceanographic Institution, Ocean University of China, Sanya 572024, China
- MOE Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China, Qingdao 266100, China
| | - Ahmed Elaswad
- School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA; (A.E.); (B.S.); (A.A.); (M.S.); (W.S.B.); (G.Q.); (D.D.); (H.L.); (Z.Q.); (R.O.); (N.M.); (N.A.); (S.D.); (R.D.)
- Center of Excellence in Marine Biotechnology, Sultan Qaboos University, Muscat 123, Oman
| | - Baofeng Su
- School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA; (A.E.); (B.S.); (A.A.); (M.S.); (W.S.B.); (G.Q.); (D.D.); (H.L.); (Z.Q.); (R.O.); (N.M.); (N.A.); (S.D.); (R.D.)
| | - Ahmed Alsaqufi
- School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA; (A.E.); (B.S.); (A.A.); (M.S.); (W.S.B.); (G.Q.); (D.D.); (H.L.); (Z.Q.); (R.O.); (N.M.); (N.A.); (S.D.); (R.D.)
- Department of Aquaculture and Animal Production, College of Agriculture and Food Sciences, King Faisal University, Al-Ahsa 31982, Saudi Arabia
| | - Mei Shang
- School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA; (A.E.); (B.S.); (A.A.); (M.S.); (W.S.B.); (G.Q.); (D.D.); (H.L.); (Z.Q.); (R.O.); (N.M.); (N.A.); (S.D.); (R.D.)
| | - William S. Bugg
- School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA; (A.E.); (B.S.); (A.A.); (M.S.); (W.S.B.); (G.Q.); (D.D.); (H.L.); (Z.Q.); (R.O.); (N.M.); (N.A.); (S.D.); (R.D.)
- Department of Forest and Conservation Sciences, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - Guyu Qin
- School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA; (A.E.); (B.S.); (A.A.); (M.S.); (W.S.B.); (G.Q.); (D.D.); (H.L.); (Z.Q.); (R.O.); (N.M.); (N.A.); (S.D.); (R.D.)
- Division of Genetics, Department of Medicine, Brigham & Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - David Drescher
- School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA; (A.E.); (B.S.); (A.A.); (M.S.); (W.S.B.); (G.Q.); (D.D.); (H.L.); (Z.Q.); (R.O.); (N.M.); (N.A.); (S.D.); (R.D.)
- Fisheries Department, Muckleshoot Indian Tribe, Auburn, WA 98092, USA
| | - Hanbo Li
- School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA; (A.E.); (B.S.); (A.A.); (M.S.); (W.S.B.); (G.Q.); (D.D.); (H.L.); (Z.Q.); (R.O.); (N.M.); (N.A.); (S.D.); (R.D.)
| | - Zhenkui Qin
- School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA; (A.E.); (B.S.); (A.A.); (M.S.); (W.S.B.); (G.Q.); (D.D.); (H.L.); (Z.Q.); (R.O.); (N.M.); (N.A.); (S.D.); (R.D.)
- MOE Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China, Qingdao 266100, China
| | - Ramjie Odin
- School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA; (A.E.); (B.S.); (A.A.); (M.S.); (W.S.B.); (G.Q.); (D.D.); (H.L.); (Z.Q.); (R.O.); (N.M.); (N.A.); (S.D.); (R.D.)
- College of Fisheries, Mindanao State University-Maguindanao, Datu Odin Sinsuat 9601, Philippines
| | - Nonkonzo Makhubu
- School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA; (A.E.); (B.S.); (A.A.); (M.S.); (W.S.B.); (G.Q.); (D.D.); (H.L.); (Z.Q.); (R.O.); (N.M.); (N.A.); (S.D.); (R.D.)
| | - Nermeen Abass
- School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA; (A.E.); (B.S.); (A.A.); (M.S.); (W.S.B.); (G.Q.); (D.D.); (H.L.); (Z.Q.); (R.O.); (N.M.); (N.A.); (S.D.); (R.D.)
- Department of Agricultural Botany, Faculty of Agriculture Saba-Basha, Alexandria University, Alexandria 21531, Egypt
| | - Sheng Dong
- School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA; (A.E.); (B.S.); (A.A.); (M.S.); (W.S.B.); (G.Q.); (D.D.); (H.L.); (Z.Q.); (R.O.); (N.M.); (N.A.); (S.D.); (R.D.)
- Department of Biological and Environmental Engineering, Cornell University, Ithaca, NY 14853, USA
| | - Rex Dunham
- School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA; (A.E.); (B.S.); (A.A.); (M.S.); (W.S.B.); (G.Q.); (D.D.); (H.L.); (Z.Q.); (R.O.); (N.M.); (N.A.); (S.D.); (R.D.)
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Brasileiro LO, Povh JA, Spica LN, Silva TV, Stringhetta GR, Teodoro GC, Sousa RM, Fernandes CE, Campos CM, Kasai RYD, Teixeira SA, Côrrea-Filho RAC. Induced reproduction of yellow-tailed lambari (Astyanax lacustris) with Ovopel® and buserelin acetate as alternatives to the protocol with carp pituitary extract. BRAZ J BIOL 2023; 83:e275678. [PMID: 38126637 DOI: 10.1590/1519-6984.275678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2023] [Accepted: 11/29/2023] [Indexed: 12/23/2023] Open
Abstract
The objective of this study was to evaluate reproductive traits in adults of Astyanax lacustris subjected to different spawning inducers. The study involved 240 females (12.54 g ± 2.33 and 7.66 cm ± 0.63 cm) and 240 males (5.83 g ± 0.39 g and 6.14 cm ± 0.64 cm), all at reproductive age. Three different inducers were evaluated: (i) 0.4 pellets of Ovopel®/kg of body weight; (ii) 0.5 ml of buserelin acetate/kg of body weight; and (iii) carp pituitary extract (CPE) (5.5 mg CPE/kg body weight for females and 2.5 mg CPE/kg body weight for males), as well as saline solution (without hormone). The degree-hours for spawning were greater (P<0.05) for the Ovopel® treatment (with 204.93) than in the treatment with CPE (183.2). Ovary weight and gonadosomatic index were higher (P<0.05) in CPE and Ovopel® treatments when compared to buserelin acetate. The number of oocytes per female, absolute and relative fecundity were greater (P<0.05) for Ovopel® and CPE treatments. Fertilization rate was higher (P<0.05) in treatment with buserelin acetate (82.3%) in relation to Ovopel® (72.33%) and CPE (62.40%) treatments, and the highest (P<0.05) hatching rates were achieved with buserelin acetate and Ovopel®. The number of larvae per female body weight was greater (P<0.05) when Ovopel® was used. In conclusion, Ovopel® proves to be a more effective reproductive inducer for induced reproduction of A. lacustris when compared to CPE and buserelin acetate.
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Affiliation(s)
- L O Brasileiro
- Universidade Federal de Mato Grosso do Sul - UFMS, Faculdade de Medicina Veterinária e Zootecnia - FAMEZ, Campo Grande, MS, Brasil
| | - J A Povh
- Universidade Federal de Mato Grosso do Sul - UFMS, Faculdade de Medicina Veterinária e Zootecnia - FAMEZ, Campo Grande, MS, Brasil
| | - L N Spica
- Universidade Federal de Mato Grosso do Sul - UFMS, Faculdade de Medicina Veterinária e Zootecnia - FAMEZ, Campo Grande, MS, Brasil
| | - T V Silva
- Universidade Federal de Mato Grosso do Sul - UFMS, Faculdade de Medicina Veterinária e Zootecnia - FAMEZ, Campo Grande, MS, Brasil
| | - G R Stringhetta
- Universidade Federal de Mato Grosso do Sul - UFMS, Faculdade de Medicina Veterinária e Zootecnia - FAMEZ, Campo Grande, MS, Brasil
| | - G C Teodoro
- Universidade Federal de Mato Grosso do Sul - UFMS, Faculdade de Medicina Veterinária e Zootecnia - FAMEZ, Campo Grande, MS, Brasil
| | - R M Sousa
- Universidade Federal de Mato Grosso do Sul - UFMS, Faculdade de Medicina Veterinária e Zootecnia - FAMEZ, Campo Grande, MS, Brasil
| | - C E Fernandes
- Universidade Federal de Mato Grosso do Sul - UFMS, Faculdade de Medicina Veterinária e Zootecnia - FAMEZ, Campo Grande, MS, Brasil
| | - C M Campos
- Universidade Estadual de Mato Grosso do Sul - UEMS, Programa de Pós-Graduação em Zootecnia, Aquidauana, MS, Brasil
| | | | - S A Teixeira
- Universidade Federal de Mato Grosso do Sul - UFMS, Faculdade de Medicina Veterinária e Zootecnia - FAMEZ, Campo Grande, MS, Brasil
| | - R A C Côrrea-Filho
- Universidade Federal de Mato Grosso do Sul - UFMS, Faculdade de Medicina Veterinária e Zootecnia - FAMEZ, Campo Grande, MS, Brasil
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Ariki DGF, Roza de Abreu M, de Jesus Silva LM, Sato RT, Batlouni SR. Attempts for increasing Astyanax altiparanae spawning rates and percentage of responsive oocytes. Anim Reprod Sci 2023; 254:107262. [PMID: 37295049 DOI: 10.1016/j.anireprosci.2023.107262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 05/17/2023] [Accepted: 05/19/2023] [Indexed: 06/12/2023]
Abstract
In this study, we aimed to propose changes in the protocol of cultured Astyanax altiparanae hypophysation to increase the maximum ovulation rate of 60% registered previously. To that two consecutive experiments were conducted. In the first experiment, three carp pituitary homogenate (CPH) doses (3, 6, and 9 mg/kg) were administered in a single injection, while in the second experiment, the 6 mg/kg CPH dose was tested either in single or double injections. In the first experiment, a single injection of 3 mg/kg CPH did not induce final oocyte maturation or spawning, while a dose of 6 mg/kg CPH resulted in an increase in the plasma level of prostaglandin (PGF2α) at ovulation. The single higher dose of 9 mg/kg CPH did not improve reproductive performance and even though anticipated the resumption of meiosis it was detrimental to the spawning rate. In the second experiment, the dose of 6 mg/kg CPH fractionated into two injections led to a higher spawning rate, spawning volume per female body mass, frequency of post-ovulatory complexes, and PGF2α concentration at ovulation compared to the single injection. The most effective treatment remained the 6 mg/kg of CPH fractionated into two injections, but still providing very low proportion of ovulated females (∼40 %). Overall, this study indicates that the spawning protocols for this species need to be improved to induce ovulation in a larger number of females and be more potent in those females that respond positively.
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Affiliation(s)
- Daniel Guimarães Figueiredo Ariki
- Centro de Aquicultura da UNESP - CAUNESP, Universidade Estadual Paulista - UNESP, Via de Acesso Prof. Paulo Donato Castellane, S/N, 14884-900 Jaboticabal, SP, Brazil
| | - Mariana Roza de Abreu
- Centro de Aquicultura da UNESP - CAUNESP, Universidade Estadual Paulista - UNESP, Via de Acesso Prof. Paulo Donato Castellane, S/N, 14884-900 Jaboticabal, SP, Brazil
| | - Laíza Maria de Jesus Silva
- Centro de Aquicultura da UNESP - CAUNESP, Universidade Estadual Paulista - UNESP, Via de Acesso Prof. Paulo Donato Castellane, S/N, 14884-900 Jaboticabal, SP, Brazil
| | - Rafael Tomoda Sato
- Centro de Aquicultura da UNESP - CAUNESP, Universidade Estadual Paulista - UNESP, Via de Acesso Prof. Paulo Donato Castellane, S/N, 14884-900 Jaboticabal, SP, Brazil
| | - Sergio Ricardo Batlouni
- Centro de Aquicultura da UNESP - CAUNESP, Universidade Estadual Paulista - UNESP, Via de Acesso Prof. Paulo Donato Castellane, S/N, 14884-900 Jaboticabal, SP, Brazil.
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Environmental Accounting of the Yellow-Tail Lambari Aquaculture: Sustainability of Rural Freshwater Pond Systems. SUSTAINABILITY 2022. [DOI: 10.3390/su14042090] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Freshwater pond aquaculture is the prevailing fish culture system worldwide, especially in developing countries. The sustainability of such systems has not been assessed and it can be improved based on suitable scientific analyses. In the present study, we apply the emergy synthesis to assess the sustainability of lambari aquaculture, used as a model of freshwater pond monoculture in Brazil, to identify the key practices, and to propose changes to improve them towards sustainability. As a study model, nine semi-intensive lambari farms operating at three levels of management were evaluated: low (LC), moderate (MC) and high (HC) control. Results showed that the main inputs for LC were services (27–46%), feed (7–39%) and water (15–21%), while for the MC and HC farms, they were feed (35–49% and 17–48%, respectively) and services (33–39% and 26–36%, respectively). All farms required more than 60% of their emergy from purchased inputs, resulting in low emergy sustainability index (ESI = 0.1–0.5). Increasing juvenile productivity, using superficial water instead of springwater, controlling pond fertilization and replacing animal protein in diet composition by vegetable sources can lead systems to higher efficiency and resilience, increasing sustainability.
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Paschoalini AL, Savassi LA, Weber AA, Moreira DP, Ribeiro YM, Rizzo E, Bazzoli N. Evaluation of the oestrogenic potential of oestrone and bisphenol-A on the reproduction of Astyanax bimaculatus males after subacute exposure. FISH PHYSIOLOGY AND BIOCHEMISTRY 2021; 47:797-810. [PMID: 33665751 DOI: 10.1007/s10695-021-00938-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Accepted: 02/22/2021] [Indexed: 06/12/2023]
Abstract
In the last decades, oestrogenic compounds have often been reported in environmentally relevant concentrations in aquatic environments around the world. Most laboratory studies of oestrogens try to understand the effects of a single contaminant, but in natural environments, the effects may be quite different due to interactions with other compounds. The present study aimed to compare the action of oestrone (E1) and bisphenol-A (BPA), acting singularly and in combination, on the spermatogenesis of Astyanax bimaculatus. After exposure to 100 ng/L of E1, BPA and a mixture of the two for 15 days, our results showed that E1 and the E1 + BPA mixture significantly altered the number of spermatogenic cells. BPA presented high cytotoxicity when compared to other treatments. Analysis of the two oestrogenic compounds suggests that the E1 + BPA mixture has no additive or synergistic effects. Together, the results of the present study indicate that endocrine-disrupting chemicals (EDCs) analysed alone may behave differently than when administered with other substances.
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Affiliation(s)
- Alessandro Loureiro Paschoalini
- Departamento de Morfologia do Instituto de Ciências Biológicas, Universdidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 31270-901, Brazil
- Programa de Pós-Graduação de Biologia de Vertebrados, Pontificia Universidade Católica de Minas Gerais, Belo Horizonte, Minas Gerais, 30535-610, Brazil
| | - Lourenço Almeida Savassi
- Departamento de Morfologia do Instituto de Ciências Biológicas, Universdidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 31270-901, Brazil
| | - André Alberto Weber
- Departamento de Morfologia do Instituto de Ciências Biológicas, Universdidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 31270-901, Brazil
- Department of Pharmacology, Robert Tukey Lab, University of California, San Diego, CA, USA
| | - Davidson Peruci Moreira
- Departamento de Morfologia do Instituto de Ciências Biológicas, Universdidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 31270-901, Brazil
| | - Yves Moreira Ribeiro
- Departamento de Morfologia do Instituto de Ciências Biológicas, Universdidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 31270-901, Brazil
| | - Elizete Rizzo
- Departamento de Morfologia do Instituto de Ciências Biológicas, Universdidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 31270-901, Brazil
| | - Nilo Bazzoli
- Programa de Pós-Graduação de Biologia de Vertebrados, Pontificia Universidade Católica de Minas Gerais, Belo Horizonte, Minas Gerais, 30535-610, Brazil.
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Reproductive cycle of the tetra Astyanax bimaculatus (Characiformes: Characidae) collected in Amazonian streams. ZYGOTE 2019; 28:37-44. [PMID: 31603066 DOI: 10.1017/s0967199419000601] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A histological characterization of gonadal development in the tetra Astyanax bimaculatus was performed, aimed at determining its reproductive cycle in streams localized inside the Amazonian forest. Collections were carried out monthly from August 2017 to July 2018 at the Zoobotânica Foundation of Marabá, PA. Collected specimens were weighed and measured, and their gonads and liver were removed and weighed to calculate gonadosomatic and hepatosomatic indexes. Gonads were fixed and treated for routine histology for light microscopy. Materials were stained with toluidine blue and haematoxylin and eosin. The Amazonian A. bimaculatus species presented two reproductive periods in the year, one at the end of the winter season and another during the summer. Females showed an asynchronous development of their oocytes and only two reproductive phases of development were observed during the whole period 'developing' and 'spawning capable'. Males presented cystic spermatogenesis, with an anastomosing tubular testis containing spermatogonia spread along the germinal epithelium (unrestricted spermatogonial). These morphological characteristics are considered phylogenetically more primitive. Male specimens were observed to have five different phases during the period: immature, initial maturation, mid maturation, final maturation and regression. The huge fluctuations in Amazonian streams was observed, in which water volumes varied considerably across seasons, culminating even in total drought. In spite of this, A. bimaculatus could be found during all seasons, showing its impressive reproductive adaptation to its conditions.
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Bernardes Júnior JJ, Bombardelli RA, Nuñer APDO. Gonadorelin increases semen production and does not affect its quality in Leporinus obtusidens. Anim Reprod Sci 2017; 185:154-160. [PMID: 28847639 DOI: 10.1016/j.anireprosci.2017.08.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Accepted: 08/15/2017] [Indexed: 11/16/2022]
Abstract
Use of carp pituitary extract (CPE) as a hormone inducer for Leporinus obtusidens is cost-prohibitive; moreover, CPE contains unknown concentrations of gonadotropins. We evaluated the efficacy of gonadorelin as a substitute by analyzing its effect on sperm characteristics of L. obtusidens and cost-effectiveness (20, 40, 60, 80, and 100μgkg-1). Untreated and CPE-treated (4mgkg-1) fish were used as negative and positive controls, respectively. Following a single intramuscular dose of hormones, semen was collected at 200°-h. At doses from 60μgkg-1, all fish produced higher milt volume (P<0.05) than the negative control (0.2-0.8mLkg-1), equal (P>0.05) to the positive control (3.52±0.97mLkg-1). Gonadorelin did not affect sperm concentration (P>0.05). The percentage of morphologically normal spermatozoa was >64% in all treatments. The number of spermatozoa with intact membrane (70%-85%) was equal (P>0.05) to that in the controls. Relative to the negative control, gonadorelin did not affect the motility rate (P>0.05). Curvilinear velocity was equal (P>0.05) to that in both controls. The sperm swimming path was linear (0.9) 10s after activation and was not (P>0.05) dose-dependent. Considering the response rate of gonadorelin-induced fish and the similarity of semen quality compared to controls, the lowest effective dose to produce a higher volume of semen in L. obtusidens is 60μgkg-1, and the cost to induce 1kg of L. obtusidens is 14.0% lower than that with CPE.
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Affiliation(s)
- Jurandir Joaquim Bernardes Júnior
- Laboratório de Biologia e Cultivo de Peixes de Água Doce (LAPAD), Departamento de Aquicultura, Centro de Ciências Agrárias, Universidade Federal de Santa Catarina, Rodovia SC 406, 3532, Florianópolis, Santa Catarina, CEP 88066-000, Brazil.
| | - Robie Allan Bombardelli
- Laboratório de Tecnologia da Reprodução de Animais Aquáticos Cultiváveis, Instituto de Pesquisas em Aquicultura Ambiental, Universidade Estadual do Paraná, Rua da Faculdade 645, Jardim La Salle, Toledo, Paraná, Brazil.
| | - Alex Pires de Oliveira Nuñer
- Laboratório de Biologia e Cultivo de Peixes de Água Doce (LAPAD), Departamento de Aquicultura, Centro de Ciências Agrárias, Universidade Federal de Santa Catarina, Rodovia SC 406, 3532, Florianópolis, Santa Catarina, CEP 88066-000, Brazil.
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Pereira TSB, Moreira RG, Batlouni SR. Dynamics of ovarian maturation during the reproductive cycle of Metynnis maculatus, a reservoir invasive fish species (Teleostei: Characiformes). NEOTROPICAL ICHTHYOLOGY 2013. [DOI: 10.1590/s1679-62252013000400010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In this study, we evaluated the dynamics of ovarian maturation and the spawning processes during the reproductive cycle of Metynnis maculatus. Adult females (n = 36) were collected bimonthly between April 2010 and March 2011. The mean gonadosomatic index (GSI) was determined, ovarian and blood samples were submitted for morphometric evaluation and the steroid plasma concentration was determined by ELISA. This species demonstrated asynchronous ovarian development with multiple spawns. This study revealed that, although defined as a multiple spawning species, the ovaries of M. maculatus have a pattern of development with a predominance of vitellogenesis between April and August and have an intensification in spawning in September; in October, a drop in the mean GSI values occurred, and the highest frequencies of post-ovulatory follicles (POFs) were observed. We observed a positive correlation between the POF and the levels of 17α-hydroxyprogesterone. Metynnis maculatus has the potential to be used as a source of pituitary tissue for the preparation of crude extracts for hormonal induction; the theoretical period for use is from September to December, but specific studies to determine the feasibility of this approach must be conducted.
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