GnRHa-induced spawning of the Eastern little tuna (Euthynnus affinis) in a 70-m3 land-based tank

Yazawa, Ryosuke; Takeuchi, Yutaka; Amezawa, Kotaro; Sato, Kenta; Iwata, Gaku; Kabeya, Naoki; Yoshizaki, Goro

doi:10.1016/j.aquaculture.2015.01.016

Cited by 20 publications

(33 citation statements)

References 19 publications

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“…We demonstrated that maturation and spawning of ELT in the tank required a temperature of at least 25°C (Yazawa et al . ), and previous reports on the spawning grounds of this species corroborated this finding (FAO ).…”

Section: Introductionsupporting

confidence: 86%

“…These ELT broodstock were used for artificial spawning induction tests with GnRHa in the 70‐m 3 land‐based tank during the spawning season in our previous study (Yazawa et al . ). After the ELT stopped spawning (last observed spawning on October 1, 2011) as the seawater temperature dropped below 24°C (Yazawa et al .…”

Section: Methodsmentioning

confidence: 97%

“…Eastern little tuna is a multiple spawner above 25°C (Yesaki & Carrara ; Collette ), and we demonstrated that GnRHa‐treated ELT can spawn multiple batches daily during the spawning season (Yazawa et al . ). We also successfully demonstrated completion of the ELT life cycle in 38‐m 3 land‐based tanks (Yazawa, Takeuchi, Amezawa, Sato, Iwata, Kabeya & Yoshizaki ).…”

Section: Introductionmentioning

confidence: 97%

“…We previously showed that GnRHa administration was required for spawning induction of ELT maintained in 38‐ and 70‐m 3 land‐based tanks (Yazawa et al . , ). We demonstrated that maturation and spawning of ELT in the tank required a temperature of at least 25°C (Yazawa et al .…”

Section: Introductionmentioning

confidence: 99%

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Spawning induction and seed production of Eastern little tuna, Euthynnus affinis (Cantor, 1849), in the post- and pre-spawning seasons by hormonal treatment in a semi-closed recirculation system with elevated temperature

et al. 2016

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We previously established a method for spawning induction in Eastern little tuna (ELT) Euthynnus affinis (Cantor, 1849) by administering a gonadotropin‐releasing hormone analog (GnRHa) during the natural spawning season in Japan (August–October). In order to establish seed production of ELT in the off‐spawning season, we first conducted three spawning induction trials by GnRHa administration from October 2011 to January 2012 using ELT broodstock (2 years old; three females and four males) maintained in a 10‐m3 tank with a semi‐closed recirculation system and static elevated temperature. Average water temperature and daily egg production in three trials lasting 11–15 days were 27.0 ± 0.09°C and 268 173 eggs (Trial 1), 27.0 ± 0.11°C and 277 9098 eggs (Trial 2), and 25.5 ± 0.39°C and 291 113 eggs (Trial 3) respectively. Mean fertilization rate and mean hatching rate were 70.4% and 60.5% (Trial 1), 83.9% and 79.6% (Trial 2), and 62.5% and 57.4% (Trial 3) respectively. We also succeeded in producing ELT larvae in the pre‐spawning season (April–July), although the quantity and quality of larvae produced were inferior to those produced in other calendar months. In trials involving periodic GnRHa administration during the off‐spawning seasons, hatched larvae were obtained in the 10‐m3 tank after six of nine administrations in the 2011–2012 off‐spawning season and in 16 of 19 administrations in the 2012–2013 off‐spawning season. The findings of this study demonstrated that hormonal treatment and thermal control could be used to extend the spawning period in ELT, potentially allowing larval production in the post‐ and pre‐spawning seasons.

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Section: Introductionsupporting

confidence: 86%

Section: Methodsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Spawning induction and seed production of Eastern little tuna, Euthynnus affinis (Cantor, 1849), in the post- and pre-spawning seasons by hormonal treatment in a semi-closed recirculation system with elevated temperature

et al. 2016

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“…Examples of genetic resource products that have been used in aquaculture include those relating to actual genetic materials such as lysosyme constructs (Fletcher et al, , p. 437) and DNA vaccines (see Poobalane, Thompson, and Adams ()) as well as products that are produced by the use of genetic materials, such as synthetic sponge chemical compounds (see Kishi, Fang, Forsyth, Scola, and Yoon ()), antifreeze protein vectors (see Sanderson & Humphries, ) and recombinant technologies such as luciferase from the deep sea shrimp (see Hitko et al ()). Examples of genetic resource processes used in aquaculture include tuna germ cell transplantation surrogate technology (see Yazawa et al, ), developing transgenic fish (see Hew & Fletcher, ), and breeding methods such as polyploidy and hybridisation (Xiang, Li, Zhou, & Zhang, ). Some countries may allow the patenting of conventional breeding techniques (see Blakeney, ).…”

Section: Addressing Challenges For a Trips‐compliant Patent Law Defenmentioning

confidence: 99%

A patent defence approach to sharing aquaculture genetic resources across jurisdictional areas

Humphries

2017

World Intellectual Property

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Access and benefit sharing (ABS) of genetic resources is a concept that is increasingly important for product development in aquaculture. ABS regulates the way aquatic genetic resources can be accessed from the world's waters and how the benefits that result from their use are shared between the providers and users of genetic resources and their derivatives. This article gives an overview of the multiple approaches to sharing aquaculture genetic resources under ABS regimes across the three jurisdictional areas in which they are found—waters within national jurisdiction, beyond national jurisdictions and in the Antarctic Treaty Area. It highlights the complexity and inconsistencies relating to obligations for technology transfer across the various regimes and the implications this has for sharing genetic resources for use in aquaculture. It offers a practical solution to navigating this complexity by using an evolving patent defence approach consistent with the World Trade Organisation's Agreement on Trade‐Related Aspects of Intellectual Property Rights (TRIPS). It concludes that this approach can guide the resolution of legal challenges that ABS regimes across the jurisdictional areas have in common, which concern derivatives and commercial use of genetic resources.

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Chapter 17 Intraperitoneal Germ Cell Transplantation Technique in Marine Teleosts

Takeuchi

Yazawa

Yoshizaki

2020

Reproduction in Aquatic Animals

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GnRHa-induced spawning of the Eastern little tuna (Euthynnus affinis) in a 70-m3 land-based tank

Cited by 20 publications

References 19 publications

Spawning induction and seed production of Eastern little tuna, Euthynnus affinis (Cantor, 1849), in the post- and pre-spawning seasons by hormonal treatment in a semi-closed recirculation system with elevated temperature

Spawning induction and seed production of Eastern little tuna, Euthynnus affinis (Cantor, 1849), in the post- and pre-spawning seasons by hormonal treatment in a semi-closed recirculation system with elevated temperature

A patent defence approach to sharing aquaculture genetic resources across jurisdictional areas

Chapter 17 Intraperitoneal Germ Cell Transplantation Technique in Marine Teleosts

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