Factors Influencing Early Survival and Growth of Laboratory‐reared Pacific Bluefin Tuna, Thunnus orientalis, Larvae

The collection of fertilized eggs for mass culture of Pacific bluefin tuna (PBT) relies on the spontaneous spawning of broodstock in captivity, and the spawning season of the broodstock is generally from mid‐May to September. The diameter of fertilized eggs from the broodstock decreases during the s...

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Published inJournal of the World Aquaculture Society Vol. 49; no. 3; pp. 484 - 492
Main Authors Tanaka, Yosuke, Kumon, Kazunori, Higuchi, Kentaro, Eba, Takeshi, Nishi, Akefumi, Nikaido, Hideki, Shiozawa, Satoshi
Format Journal Article
LanguageEnglish
Published Hoboken, USA Wiley Subscription Services, Inc 01.06.2018
John Wiley & Sons, Inc
Subjects
Aeration
Breeding stock
Captivity
egg diameter
Eggs
Fish
Growth rate
Hatching
Individual rearing
Larvae
Marine fishes
Mass culture
Night
Night-time
Nighttime
Pacific bluefin tuna
Polybutylene terephthalates
Spawning
Spawning seasons
Survival
Thunnus orientalis
Tuna
Variance analysis
Water temperature
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Summary:The collection of fertilized eggs for mass culture of Pacific bluefin tuna (PBT) relies on the spontaneous spawning of broodstock in captivity, and the spawning season of the broodstock is generally from mid‐May to September. The diameter of fertilized eggs from the broodstock decreases during the spawning season. To investigate the influence of three potential factors, the egg diameter (larger or smaller), the rearing water temperature (25 or 28 C), and the aeration rate during the night (strong or weak), on early survival and on growth of PBT larvae, replicate trials were conducted to assess these three factors until 7 d after hatching (d.a.h.). At 7 d.a.h., survival rates of larvae reared with strong nighttime aeration were found by a three‐way ANOVA to be significantly higher than for larvae reared with weak aeration. Furthermore, growth rates of PBT larvae hatched from larger eggs were significantly faster than those from smaller eggs. However, a significant difference in the survival rate was not detected for the factors, egg diameter and rearing water temperature. The results indicate that rearing with strong nighttime aeration significantly improved the early survival of PBT larvae and the egg diameter (a proxy for egg quality) and influenced growth.
ISSN:0893-8849
1749-7345
DOI:10.1111/jwas.12453