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Aquaculture process for production of salmon eggs

A technology for aquaculture, salmon, applied in the field of spawning from Atlantic salmon, which can solve problems such as difficult separation and complex interaction

Active Publication Date: 2020-09-11
ストフンフィスクルエイチエフ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is clear that the interactions of these and other factors for maturation are complex and their separation is therefore very difficult

Method used

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  • Aquaculture process for production of salmon eggs
  • Aquaculture process for production of salmon eggs
  • Aquaculture process for production of salmon eggs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0119] Atlantic salmon strains were reared in closed freshwater tanks in Kollafjordur, Iceland.

[0120] After silvering, smolt is then reared at two sites, Kalmanstjorn and Vogavik (Iceland). Rearing takes place in recirculating land-based tanks using water from the surrounding area.

[0121] Initially, each group contained an average of approximately 2000 silverized fish, housed in two tanks, and results are expressed as the mean value per group.

[0122] During rearing, changes were made to parameters (temperature and time) during the first simulated winter period after silverization, while other conditions were kept relatively constant during subsequent simulated summer and winter periods until egg harvest.

[0123] Table 1. Summary of salmon rearing batches.

[0124]

[0125] The results are summarized in Table 1. It can be seen that at very high ATU there is a rather sharp increase in egg mortality, which offsets the apparent increase in egg size with increasing ...

Embodiment 2

[0127] To further investigate the effect of ATU on egg quality, rearing results of a total of 62 groups of Atlantic salmon obtained over a period of several years were analysed. Each group was reared under the conditions described above. Based on the measurement of the number of fish eggs per unit volume (L), the average fish egg diameter was calculated assuming that the fish eggs were spherical with uniform size.

[0128] from figure 1 It can be seen that there is a clear and strong correlation between average fish egg size and ATU (up to about 4000 ATU). However, if figure 2 As shown, the average fish egg mortality increased only slightly in this ATU range.

[0129] However, at very high ATU, the average egg size tends to stabilize. At the same time, the mortality rate of fish eggs increased, indicating that there is an upper limit of ATU for obtaining high-quality fish eggs.

[0130] These experiments indicated that for optimal egg harvest with high egg quality (size)...

Embodiment 3

[0132] A total of 46 groups of salmon reared at two Icelandic sites (Kalmanstjorn and Vogavik) were analyzed for egg size and mortality, comprising a total of 324 batches.

[0133] The feeding conditions were as described in Example 1. Salmon are silvered and then reared to an average size of about 4 kg per fish under simulated summer conditions (an average of about 22 hours of light exposure every 24 hours) before beginning the winter-summer period during which, Average light exposures were about 8 hours (winter) and 22 hours (summer), respectively.

[0134] Mortality (average ATU over the incubation period of eggs) was assessed at the ocular stage. Egg size was determined as the total number of eggs per liter of volume.

[0135] In total, 238 million eggs were analyzed. Data were analyzed using the RStudio program. Normality and homogeneity of variances were determined by the Shapiro-Wilk test (P>0.05). After accepting the normal distribution of the data, one-way ANOVA ...

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Abstract

A process for harvesting fish eggs is provided, in particular fish eggs from Salmon. The process comprises rearing sexually immature salmon in an aquatic environment in stages during which at least the light exposure and time span is adjusted. The rearing includes at least a winter-summer period that comprises a winter life-cycle stage, within which the broodstock is exposed to light that simulates winter light exposure, and a subsequent summer life-cycle stage, within which the broodstock is exposed to light that simulates summer light exposure, wherein the total Accumulated Thermal Unit (ATU) during the winter-summer period is no more than 5000. The inventions also provides salmon eggs that are produced by the disclosed process.

Description

[0001] field of invention [0002] The present invention relates to methods of producing eggs from mature fish. In particular, the invention relates to methods of producing eggs from Atlantic salmon (Salmosalar). Background technique [0003] Atlantic salmon is a species of fish in the family Salmonidae. Due to human introductions, this species is found in the North Atlantic, in rivers flowing into the North Atlantic, and in the North Pacific. [0004] The natural life cycle of salmon goes through several stages. Salmon are initially born as small translucent eggs in gravel nests at the bottom of freshwater streams or rivers. The eggs, also called roes, are usually pink or red and roughly spherical. Eggs develop over a period of 2 to 3 months in their natural habitat. During this time, the eyes and other organs begin to develop and become visible. [0005] Hatching is the process by which salmon offspring shed their eggs but retain the yolk as a source of nutrients. At ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01K61/10A01K61/17
CPCA01K61/10A01K61/17Y02A40/81A01K61/95A01K63/065
Inventor J·乔纳森B·冈拉乌格斯特尔H·赫雷达松D·哈尔达森
Owner ストフンフィスクルエイチエフ
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