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Journal article
Effects of hormonal treatments on spawning latency and egg production of captive silver trevally (Pseudocaranx georgianus)
Aquaculture Reports, Vol.43, pp.1-11
2025
Abstract
Controlling reproduction is a vital step in aquaculture to ensure the production of high-quality fertilized eggs in adequate quantities. The silver trevally (Pseudocaranx georgianus) is a candidate for the diversification and expansion of the New Zealand aquaculture sector, but initial research showed that it fails to spawn spontaneously in captivity. Therefore, we induced spawning in wild-caught, captivity-acclimated broodstock using an agonist of gonadotropin-releasing hormone (GnRHa) in slow-release implants or an injection of human chorionic gonadotropin (hCG). The GnRHa implants at a dose of 83–152 μg kg−1 body weight (BW) for females and 58–167 μg kg−1 BW for males induced spawning with latency times of 2 days post-administration. The hCG injection at a dose of 600 IU kg−1 BW for both males and females induced spawning with latency times of 8 days post-administration. Total egg production was comparable between GnRHa (∼ 2.8 million eggs kg−1 BW) and hCG treatments (∼ 3.5 million eggs kg−1 BW) with egg quality being variable and having a high percentage non-fertilized and dead eggs (66–84 %). On average, egg diameter and total body length of newly-hatched larvae were significantly larger from GnRHa-treated fish compared to those from hCG-treated fish (P = 0.0121 and P < 0.0001, respectively), while the average oil globule diameter of newly-hatched larvae was significantly smaller from GnRHa-treated fish compared to those from hCG-treated fish (P = 0.0062). Both hormonal treatments demonstrated “proof-of concept” in silver trevally by spawning adequate numbers of eggs, but optimization of the treatment is necessary (dose, administration time, etc.), to achieve better egg viability and fertilization success.
Details
- Title
- Effects of hormonal treatments on spawning latency and egg production of captive silver trevally (Pseudocaranx georgianus)
- Authors
- Matthew J Wylie (Corresponding Author) - New Zealand Institute for Plant and Food Research LimitedFlavio F Ribeiro - New Zealand Institute for Plant and Food Research LimitedWarren Fantham - New Zealand Institute for Plant and Food Research LimitedMorgan E Puklowski - New Zealand Institute for Plant and Food Research LimitedRia Rebstock - New Zealand Institute for Plant and Food Research LimitedNicola Shaw - New Zealand Institute for Plant and Food Research LimitedConstantinos C Mylonas - Hellenic Centre for Marine ResearchKeitaro Kato - Kindai UniversityAbigail Elizur - University of the Sunshine Coast, Queensland, Centre for BioinnovationMaren Wellenreuther - University of Auckland
- Publication details
- Aquaculture Reports, Vol.43, pp.1-11
- Publisher
- Elsevier BV
- Date published
- 2025
- DOI
- 10.1016/j.aqrep.2025.102964
- ISSN
- 2352-5134
- Copyright note
- © 2025 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/bync/4.0/).
- Data Availability
- Data will be made available on request.
- Grant note
- This research was funded by the Royal Society of New Zealand Catalyst Seeding General Contract “Enabling breeding of indigenous aquaculture species by overcoming reproductive dysfunctions” CSG-PAF1803 (to MW and MJW), and through the MBIE Endeavour Program “Accelerated breeding for enhanced seafood production” (#C11X1603) to MW.
- Organisation Unit
- Centre for Bioinnovation
- Language
- English
- Record Identifier
- 991144240102621
- Output Type
- Journal article
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