Short term cold storage and sperm concentration assessment of lumpfish (Cyclopterus lumpus. L) Milt

Pountney, Samuel M.; Migaud, Hervé; Davie, Andrew

doi:10.1016/j.aquaculture.2020.735646

Cited by 7 publications

(2 citation statements)

References 39 publications

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“…Recent findings have shown that, environmental cues such as photoperiod and temperature can be used to control gonadal development and timing of spawning in lumpfish (Imsland et al, 2018, 2019; Pountney, Lein, et al, 2020). A successful control of reproduction will ensure closing the life cycle of lumpfish under farm conditions, leading to a sustainable breeding (Pountney, Migaud, & Davie, 2020) with a year‐round availability of juveniles for stocking in salmon cages (Powell et al, 2018). Therefore, development and validation of reliable hatchery production protocols is an integral step towards a sustainable lumpfish juvenile production (Pountney, Migaud, & Davie, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…A successful control of reproduction will ensure closing the life cycle of lumpfish under farm conditions, leading to a sustainable breeding (Pountney, Migaud, & Davie, 2020) with a year‐round availability of juveniles for stocking in salmon cages (Powell et al, 2018). Therefore, development and validation of reliable hatchery production protocols is an integral step towards a sustainable lumpfish juvenile production (Pountney, Migaud, & Davie, 2020). Using environmental cues to control reproduction should be accompanied with monitoring of the gonadal development for more accurate prediction of ovulation (Ortenburger et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

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Ultrasonic imaging as a means of monitoring gonadal development in lumpfish (Cyclopterus lumpus)

Mlingi,

Puvanendran,

Burgerhout

et al. 2023

Physiological Reports

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The commercial farming of juvenile lumpfish requires monitoring of gonadal development to achieve synchronized production. Conventional methods such as gonadosomatic index (GSI), sex hormone analyses, gonadal histology, endoscopy, and gene expression analyses are costly, invasive, and often involve sacrificing the fish. We assessed the efficiency of ultrasound as a non‐invasive method for monitoring gonadal development in lumpfish. Based on ultrasound observations, we categorized the fish into six stages; F0 to F5 for females and M0 to M5 for males, that represented maturity levels from immature to spent. Importantly, the ultrasound gonadal stages aligned with histological gonadal stages. Additionally, ultrasound stages aligned with profiles of GSI, testosterone (T), 11‐ketotestosterone, and 17β‐estradiol throughout gonadal development including the spawning period. Moreover, these parameters exhibited significant positive correlations with each other reflecting their parallel trends during gonadal development. To minimize the frequency of ultrasound usage and fish handling, we established F3 and M3/M4 as arbitrary thresholds for identifying ripe females and males, respectively. By using these thresholds, the need for regular ultrasound monitoring could be reduced during most of the rearing period. Ultrasound proves to be useful and reliable for monitoring gonadal development in lumpfish, enabling synchronized production of juvenile fish.

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