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Calendar Timing in Teleost Fish

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Neuroendocrine Clocks and Calendars

Part of the book series: Masterclass in Neuroendocrinology ((MANEURO,volume 10))

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Abstract

Teleosts are the largest and most diverse group of vertebrates. Although a complex variety of environmental cues influence and time their behaviour and physiology, seasonality is prevalent in many groups and has been particularly studied in salmonids where photoperiodic effects on juvenile development (smoltification) and reproductive physiology (e.g. spawning) are well characterized. This chapter considers evidence for processing of photoperiodic information via local regulation of thyroid hormone availability in the saccus vasculosus, a circumventricular organ located on the ventral side of the brain behind the pituitary gland. As this structure is not present in all photoperiodic teleosts, the chapter also discusses the role of the optic tectum, as this region expresses photoreceptors and melatonin receptors. Unlike mammals, fish (like birds) display decentralized control of photoperiodic responses, as multiple tissues may possess the cellular machinery to respond independently.

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Further Recommended Reading

  • Nakane Y, Ikegami K, Iigo M, Ono H, Takeda K, Takahashi D, Uesaka M, Kimijima M, Hashimoto R, Arai N, Suga T, Kosuge K, Abe T, Maeda R, Senga T, Amiya N, Azuma T, Amano M, Abe H, Yamamoto N, Yoshimura T (2013) The saccus vasculosus of fish is a sensor of seasonal changes in day length. Nat. Commun. 4:1–7

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  • Research paper identifying the saccus vasculosus as a key transducer of photoperiod in some species of teleosts, a structure not found in higher vertebrates.

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  • Saha S, Singh KM, Gupta BBP (2019) Melatonin synthesis and clock gene regulation in the pineal organ of teleost fish compared to mammals: Similarities and differences. General and Comparative Endocrinology 279:27–34

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Correspondence to Alexander C. West .

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West, A.C., Hazlerigg, D.G., Grenier, G. (2020). Calendar Timing in Teleost Fish. In: Ebling, F.J.P., Piggins, H.D. (eds) Neuroendocrine Clocks and Calendars. Masterclass in Neuroendocrinology, vol 10. Springer, Cham. https://doi.org/10.1007/978-3-030-55643-3_7

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