I also take the fish oil that came with the kit along with a sublingual B complex. 174. Thyrotropin–releasing hormone (TRH) inhibits melanin–concentrating hormone neurons: Implications for TRH–mediated anorexic and arousal actions. Gen Comp Endocrinol (2020) 292:113446. doi: 10.1016/j.ygcen.2020.113446, 233. doi: 10.1677/JOE-08-0410, 27. Releasing thyroid hormones thyroxine, triiodothyronine and calcitonin. Differential sensitivity of cells of follicular epithelium and oocytes in the stellate sturgeon to unfavorable conditions, and correlating influence of triiodothyronine. Nippon Suisan Gakkasishi (1989) 55(7):1189–95. Function: Photosensory and secretory function, Kumar S and Tembhre M (1996); Anatomy and Physiology of Fishes, Vikas Publishing House Pvt Ltd, India. These vessels are invaded into the pars distalis together with the interdegitations of the anterior neurohypophysis. Comparative thyroidology: Thyroid gland location and iodothyronine dynamics in Mozambique tilapia (Oreochromis mossambicus Peters) and common carp (Cyprinus carpio L.). In mammals, circadian cycles of TRH and TSH are controlled by “pacemakers” within the superchiasmatic nucleus (SCN) of the hypothalamus. These hormones are called triiodothyronine (T3) and thyroxine (T4). doi: 10.1371/journal.pone.0184992, 175. Thyroid hormones down–regulate thyrotropin β mRNA level in vivo in the turbot (Psetta maxima). doi: 10.1016/0024-3205(76)90162-4, 41. Gen Comp Endocrinol (2007) 150(1):151–63. doi: 10.1007/s10695-006-0034-1, 261. Changes in plasma steroid and thyroid hormones and insulin during final maturation and spawning of the sea lamprey, Petromyzon marinus. In fishes like Cymatogastes aggregate, Anguilla Anguilla and Salmo gairdneri, neurosecretory axons do not enter the pars intermedia but terminate in extravascular channels bordering the pars intermedia or terminate at the basement membrane. doi: 10.1016/j.ygcen.2013.09.017, 75. The thyroid carries 2 side lobes , hooked up by a bridge ( isthmus ) in the centre . doi: 10.1371/journal.pone.0111361, 35. High prevalence of skeletal deformity and reduced gill surface area in triploid Atlantic salmon (Salmo salar L.). Oppenheimer JH, Schwartz HL, Lane JT, Thompson MP. Shrimpton JM, McCormick SD. What is the function of the T hyroid Gland?. It also stimulates the melanin synthesis. These act on tissues to promote cellular proliferation and differentiation (142, 143). Based on a symposium sponsored by the Environmental Division of the American Chemical Society, Perchlorate in the Environment is the first comprehensive book to address perchlorate as a potable water contaminant. Fish Physiol Biochem (1990) 8(6):515–20. In the Atlantic stingray (Dasyatis sabina), circulating T3 levels and thyroid activity are low in immature individuals and high in females undergoing oogenesis, and, from ovulation throughout gestation (225, 226). J Fish Res Board Canada (2011) 31:1787–90. 388. Recently on the basis of immunocytochemistry, the cells are classified according to hormones released by the pro-adenohypophysis. doi: 10.1210/en.2004-0545, 315. Thyroid hormone transporters. doi: 10.1016/j.cub.2015.02.026, Keywords: fish, thyroid, hormones, reproduction, osmoregulation, feeding, metabolism, Citation: Deal CK and Volkoff H (2020) The Role of the Thyroid Axis in Fish. Expert [small hands] can palpate nodules, but the ultrasound is the gold-standard. doi: 10.22059/IJER.2014.802. Influence of bovine growth hormone and l–thyroxine on growth, muscle composition, and histological structure of the gonads, thyroid, pancreas, and pituitary of coho salmon (Oncorhynchus kisutch). Gen Comp Endocrinol (2009) 164(1):40–50. doi: 10.1177/0748730418766601, 72. Nakane Y, Ikegami K, Iigo M, Ono H, Takeda K, Takahashi D, et al. The TR binds to a TRE as a monomer, a homodimer (α/α, α/β, β/β) or a heterodimer, in which a TR isoform dimerizes with the retinoid X receptor (RXR) (99). Gen Comp Endocrinol (1985) 58(3):436–42. Functions of thyroid hormone receptors in mice. The thyroid gland is the gland that is located below your Adam’s apple just in front of your neck. Several histological investigations demonstrate a stimulation of the pars intermedia associated with reproduction. Less active follicles generally have thin epithelium. It has been considered that thyroid influences the growth and nitrogen metabolism in goldfish, as indicated by high ammonia excreted by them. doi: 10.1007/s00360-017-1094-5, 74. Usually in cyclostomes it is smaller but increases in bony fishes, with prominence in groove or depression of para-sphenoid bone receiving the gland. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. 336-346. Fertility. This suggests that THs are essential for spermatogenesis in males but are reproductive stage-specific and seem to have the greatest effect in periods of active spermatogenesis. De Vincentis S, Monzani ML, Brigante G. Crosstalk between gonadotropins and thyroid axis. The thyroid hormones (THs), thyroxine (T4) and triiodothyronine (T3) are products of the thyroid gland in all vertebrates. Their role in early development and metamorphosis is well established in mammals and amphibians, respectively, and recently several studies in fish have highlighted the importance of THs during flatfish metamorphosis. In salmonids the CS is located near the middle part of mesonephros but in majority of fishes they are situated at the posterior end of kidney. doi: 10.1530/jrf.0.1130239. Melamed P, Eliahu N, Levavi–Sivan B, Ofir M, Farchi–Pisanty O, Rentier–Delrue F, et al. Metabolism is the rate at which all the chemistry of the body works. Tartaglia LA, Dembski M, Weng X, Deng N, Culpepper J, Devos R, et al. On the basis of binding affinities with ribonucleoprotein the two classes are also classified as chromophobes and chromophils. Thyroid (2019) 30(1):161–74. HYP, hypothalamus; TRH, thyrotropin-releasing hormone; CRH, corticotropin-releasing hormone; TSH, thyrotropin, TSHR, thyrotropin receptor; MCT8, monocarboxylase transporter 8; T4 thyroxine, T3 triiodothyronine; rT3, reverse triiodothyronine; T2, diiodothyronine; DIO1, deiodinase I; DIO2, deiodinase II; DIO3, deiodinase III; TR, thyroid receptor; IGF-I, insulin-like growth factor I; IGF-III, insulin-like growth factor III; 3β-HSD, 3β-hydroxysteroid dehydrogenase; CYP19, aromatase. The human thyrotropin–releasing hormone gene is regulated by thyroid hormone through two distinct classes of negative thyroid hormone response elements. Chromaffin Tissue or Suprarenal Bodies or Medullary Tissue: In lamprey (Cyclostomata) the chromaffin cells are present in the form of strands along the dorsal aorta as in the ventricle and the portal vein heart. secretes metabolic hormones important to the growth of the human body. doi: 10.1016/j.ygcen.2009.05.016, 243. Thyroid activity in the ovo–viviparous elasmobranch Squalus acanthias. 41. Androgens have been shown to enhance thyroidal function in most teleosts examined [e.g., striped catfish (Mystus vittatus) (274); rainbow trout (275); masu salmon (276); coho salmon (277), striped catfish (274)]. For example, low protein diets reduce plasma T4 levels and/or 5’-MDA activity in rainbow trout (352) and brook trout (353). The thyroid hormones are secreted by the thyroid gland, which is located in front of the neck. Milosević V, Sekulić M, Brkić B, Lovren M, Starcević V. Effect of centrally administered somatostatin on pituitarythyrotropes in male rats. In rodents, THs have been shown to stimulate GH synthesis and secretion (154, 155), upregulate SS receptors (156) and increase SS immunoreactivity and release (157). Dose–related effects of 17βoestradiol (E2) on liver weight, plasma E2, protein, calcium and thyroid hormone levels, and measurement of the binding of thyroid hormones to vitellogenin in rainbow trout, Salmo gairdneri Richardson. Others have internal fertilization and the egg/embryo develops within the mother. Several isoforms of deiodinases (DIOs) with different catalytic properties (type 1, 2, and 3, or DIO1, DIO2, DIO3) and tissue- and developmental stage-specific expressions exist (59). Effects of growth hormone, insulin–like growth factor I, triiodothyronine, thyroxine, and cortisol on gene expression of carbohydrate metabolic enzymes in sea bream hepatocytes. doi: 10.1007/BF00004580, 21. Somatostatin in the physiologic feedback control of thyrotropin secretion. 254. p. 699–727. Gross WL, Fromm PO, Roelofs EW. Pavlov ED, Zvezdin AO, Pavlov DS. Kristensen K, Pedersen SB, Langdahl BL, Richelsen B. 404. Such hormones are called tropins or tropic hormones. Endocrinology (1954) 55:589–92. doi: 10.1023/A:1007791415780, 50. Privacy Policy 8. J Endocrinol (1961) 22(4):395–NP. Male glands are smaller than those of females. Hirata Y, Kurokura H, Kasahara S. Effects of thyroxine and thiourea on the development of larval red sea bream Pagrus major. Hypothalamic– and pituitary–derived growth and reproductive hormones and the control of energy balance in fish. Branchial Na+–K+–ATPase activity in freshwater or saltwater acclimated tilapia, Oreochromis (Sarotherodon) mossambicus: Effects of cortisol and thyroxine. Lin MT, Chu PC, Leu SY. Following TH treatment, plasma glucose levels increase in red sea bream (348), gilthead sea bream (349), and European eel (346), but decrease in rainbow trout (350). Can J Zool (1958) 36(2):113–21. In fishes there is only one functional gonadotropin is found, which is often regarded as piscian pituitary gonadotropin (PPG). In other species their number varies from one to four. Groeneweg S, van Geest FS, Peeters RP, Heuer H, Visser WE. If the body needs more energy in certain situations – for instance, if it is growing or cold, or during pregnancy – the thyroid gland produces more hormones. The mesoadenohypophysis (proximal pars distalis) contains cells which produce gonadotropin (GTH) and growth hormone (GH). 173. Application of thyroid and steroid hormones as anabolic agents in fish culture. The master of the anatomy is a head-and-neck surgeon. 19.1). Gen Comp Endocrinol (1988) 69(1):80–7. Gen Comp Endocrinol (2000) 120(1):88–98. Muhammad DS, Wang Y, Wang W, Jakhrani F, Qi J. doi: 10.1016/S0015-0282(16)55974-3, 230. In: Finn RN, Kapoor BG, editors. In this species, T3 in yolk increases from pre- to post-ovulation and peaks during the pregnancy stage, and maternal serum T3 concentrations increase as development progresses, suggesting that maternal THs are needed for development of the egg/embryo (140). Europe PMC is an archive of life sciences journal literature. Rocha A, Gómez A, Galay–Burgos M, Zanuy S, Sweeney GE, Carrillo M. Molecular characterization and seasonal changes in gonadal expression of a thyrotropin receptor in the European sea bass. Applying thiourea reduces liver glycogen. THs appear to exert an inhibitory feedback action on TSH, but there is no clear evidence for TRH. Use of pituitary hormones in induced breeding: The pituitary hormones have practical applications by injecting and implanting to force or stimulate spawning of certain fishes of great economic value, such as trouts (Salmoninae), catfishes (Ictaluridae), Mullets (Mugliliade), and sturgeons (Acipenseridae). doi: 10.1016/j.cbpa.2008.08.017, 79. Effects of synthetic mammalian thyrotrophin releasing hormone, somatostatin and dopamine on the secretion of prolactin and growth hormone from amphibian and reptilian pituitary glands incubated in vitro. Calcitonin is said to be related with the osmoregulation. Origin: Two parts of pituitary gland are derived from two different components. Fish Larval Physiology. Figure 5. Klemperer JD, Klein I, Gomez M, Helm RE, Ojamaa K, Thomas SJ, et al. doi: 10.1016/j.ygcen.2013.08.003, 398. Thyroid hormones affect every cell and all the organs of the body. Minireview: The neural regulation of the hypothalamic–pituitary–thyroid axis. It has been considered that among teleosts the Cypriniformes or Siluriformes have reduced portal system. Olivereau M, Leloup J, De Luze A, Olivereau J. Effet de l’oestradiol sur l’axe hypophyso–thyroïdien de l’anguille. Intramuscular injection of corticosteroid compounds to the oyster toadfish causes increase in blood sugar level thus showing control on carbohydrate metabolism. Smoltification. Boston, MA: Springer US (1985). doi: 10.1210/en.2012-1467, 24. J Fish Biol (1989) 34(4):515–27. doi: 10.1016/0044-8486(83)90292-2, 368. Denver RJ, Licht P. Thyroid status influences in vitro thyrotropin and growth hormone responses to thyrotropin–releasing hormone by pituitary glands of hatchling slider turtles (Pseudemys scripta elegans). Besson M, Feeney WE, Moniz I, François L, Brooker RM, Holzer G, et al. পুকুরের জলজ আগাছা: প্রকারভেদ, গুরুত্ব ও অপসারণ কৌশল, বাংলাদেশে শুঁটকি মাছের ইতিবৃত্ত: বর্তমান বাজার, চাহিদা ও পুষ্টিগুণ, বাংলাদেশের মৎস্যখাতে সম্ভাবনাময় একটি প্রজাতির নাম জায়ান্ট বার্ব (Giant barb), বাহারি মাছে সম্ভাবনাময় বাংলাদেশ: অগ্রগতি, কর্মসংস্থান ও চাহিদা, মাছ চাষের সাধারণ সমস্যা ও সমাধান: পুকুরের পানিতে লাল স্তর, মাছ ও চিংড়ির স্বাস্থ্য ব্যবস্থাপনায় দেশীয় প্রযুক্তিগত জ্ঞান ব্যবহার, শ্রিম্প টয়লেট (shrimp toilet): চিংড়ি চাষের উৎপাদন বাড়াতে অভিনব এক প্রযুক্তি, BdFISH: Bangladesh Fisheries Information Share Home, Regulates the growth and secretion from thyroid, Gonadotropin e.g. In precocious male masu salmon (Oncorhynchus masou), the SV responds to changes in light, with salmon kept under long periods of light displaying high TSHβ and DIO2 protein levels, the opposite occurring with exposure to short periods of light (77). Ortiga–Carvalho TM, Sidhaye AR, Wondisford FE. Holloway AC, Sheridan MA, Van Der Kraak G, Leatherland JF. We acknowledge former and current researchers adding to the field of fish thyroid biology. The saccus vasculosus of fish is a sensor of seasonal changes in day length. Encyclopedia of Reproduction, 2nd ed. McCormick SD, O’Dea MF, Moeckel AM, Lerner DT, Björnsson BT. Stathatos N. Thyroid Physiology. doi: 10.1016/0044-8486(85)90276-5, 277. Timmermans LP, Chmilevsky DA, Komen H, Schipper H. Precocious onset of spermatogenesis in juvenile carp (Cyprinus carpio L., Teleostei) following treatment with low doses of L–thyroxine. MSH and MCH (melanophore dispersing and melanophore contracting hormone). 320. This site uses Akismet to reduce spam. (function(d, s, id) { Nakamura O, Suzuki R, Asai K, Kaji H, Kaneko T, Takahashi Y, et al. 206. Indian J Fish (2000) 47(4):337–42. In many teleosts, thyroid becomes a diffused structure as small masses of follicles. Oxford: Academic Press (2018). Dangé AD. Bhumika S, Lemmens K, Vancamp P, Moons L, Darras VM. Eales JG. Pituitary glands regulate the activities of different endocrine glands that are thyroid, adrenal glands. Daily endocrine profiles in parr and smolt Atlantic salmon. Function: Regulates calcium level in blood. Thus it is clear that on neuroendocrine factor reaching the GH cells and probably the GH cells are regulated by a dual hormone. Arch Environ Contamination Toxicol (1998) 34(4):377–81. For example, teleostean DIO1 is resistant to propylthiouracil (PTU, inhibitor of thyroperoxidase, TPO—responsible for iodide to iodine oxidation in thyroid follicles) inhibition, and teleosts have relatively higher levels of hepatic DIO2 activity and expression compared to other vertebrates (67). cortex and medulla are separately found. Safian D, Morais RDVS, Bogerd J, Schulz RW. Landines MA, Sanabria AI, Senhorini JA, Urbinati EC. doi: 10.1006/gcen.1997.6960, 51. THs affect physiological processes by regulating expression of genes in target tissues (genomic actions) (95). During sex change, TRα expression decreases then subsequently increases during ovary development and maturation and TRβ expression is highest in mature ovary after sex change than in any other gonadal or sex stage (242). In mammals, and most vertebrates, the thyroid gland is an encapsulated gland in the neck region. The thyroid gland secretes many hormones, collectively called thyroid hormones, The thyroid gland consists of two lobes, the right & the left lobes joined together by an intermediate structure, the isthmus, It is located in the anterior part of the lower neck, below the larynx (voice box), It secretes hormones vital to metabolism & growth. It is made up of columnar cells which are covered by a fibrous capsule. Nuclear TRs act as ligand-modulated transcription factors, In the absence of T3, TR represses transcription by recruiting corepressors [e.g., nuclear-receptor co-repressor (NCoR)/silencing-mediator for retinoid/thyroid hormone receptors (SMRT)], whereas in the presence of T3, TRs recruit coactivators [e.g., steroid receptor coactivator (SRC), p300/CREB-binding protein (CBP)] to facilitate transcription (96). Barington M, Brorson MM, Hofman–Bang J, Rasmussen ÅK, Holst B, Feldt–Rasmussen U. Ghrelin–mediated inhibition of the TSH–stimulated function of differentiated human thyrocytes ex vivo. doi: 10.1006/gcen.1998.7124, 26. Mitsuma T, Hirooka Y, Mori Y, Kayama M, Adachi K, Rhue N, et al. Gen Comp Endocrinol (2012) 175(1):19–26. Encyclopedia of Fish Physiology. Parra MAL. doi: 10.1007/BF00005452, 334. Functional relationship of thyroid hormone–induced lipogenesis, lipolysis, and thermogenesis in the rat. Gen Comp Endocrinol (1979) 39(2):236–43. Mechanisms of crosstalk between endocrine systems: Regulation of sex steroid hormone synthesis and action by thyroid hormones. Kreider MS, Winokur A, Manaker S, Pack AI, Fishman AP. doi: 10.1016/j.cbpa.2010.07.010, 352. The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. Disclaimer 9. However, two-cell types are found in pacific salmon. Neurohypophysis develops from the floor of the embryonic diencephalons. p. 83–102. 146. Thornburm CC, Matty AJ. In majority of teleosts the thyroid is un-encapsulated and thin follicles are dispersed or arranged in clusters around the base of afferent branchial arteries. Thyroid hormone–induced swim bladder and eye maturation are transduced by IGF–1 in zebrafish embryos. 380. Central and peripheral integration of interrenal and thyroid axes signals in common carp (Cyprinus carpio L.). Diagram 10.—Fish 107, S. irideus, length 14 cm. Metabolic hormones modulate the effect of growth hormone (GH) on insulin–like growth factor–I (IGF–I) mRNA level in primary culture of salmon hepatocytes. Annual sex steroid and other physiological profiles of Pacific lampreys (Entosphenus tridentatus). doi: 10.1152/ajpregu.1995.269.6.R1434. Mammalian endocrine glands are well advance and well-studied but fish endocrinology is limited to the work on its influence on chromatophores, action of sex cells, function of pituitary and thyroid and control on migration. In goldfish, monocrotophos decrease TH levels, and up-regulate pituitary TSHβ and hepatic DIO1 and DIO3 expressions (397). The thyroid gland is about 2 inches long and lies in front of your throat below the prominence of thyroid cartilage sometimes called the Adam's apple. In Carassius auratus the number of PbH+ve cells increases after spawning in both number and activity during oogenesis and breeding season. Typically the gland is small and paired and is situated in the transverse septum between the abdominal cavity and sinus venosus just ventral to the oesophagus or near the thyroid gland. p. 1348–53. In male vertebrates, Sertoli and Leydig cells are responsible for spermatogenesis and androgen biosynthesis, respectively, whereas oogenesis is stimulated by ovarian estrogen and progestins in females (254). Zezza P. Tiroide, maturita sessuale e gestazione in Torpedo ocellata. 403. Aquaculture Int (1994) 2(3):154–64. Thyroid hormone influences osmoregulation in. Tachihara K, El–Zibdeh MK, Ishimatsu A, Tagawa M. Improved seed production of goldstriped amberjack Seriola lalandi under hatchery conditions by injection of triiodothyronine (T3) to broodstock fish. Measurement and regulation of thyroidal status in teleost fish. In all vertebrates, the thyroid axis is an endocrine feedback system that affects growth, differentiation, and reproduction, by sensing and translating central and peripheral signals to maintain homeostasis and a proper thyroidal set-point. On ventral aspect the gland gradually tapers caudally from rounded anterior end. Biol Reprod (2005) 72(6):1429–36. Leiner KA, Han GS, MacKenzie DS. In mammals, the link between thyroid and reproductive function is well established. Usher ML, Talbot C, Eddy FB. Influence of ration level and salinity on circulating thyroid hormones in juvenile Atlantic salmon (Salmo salar). This cookie is set by GDPR Cookie Consent plugin. "the chemical processes within the human body". J Endocrinol (2005) 184(2):341–9. doi: 10.1006/gcen.2001.7733, 221. León A, Teh SJ, Hall LC, Teh FC. doi: 10.1007/s10695-015-0063-8, 338. According to Garrett (1942), there is a gradual reduction in number of CS that has occurred during evolution of Holostei and Teleostei. Studies of Peter and Crim (1978) on Carassius auratus indicate that the nucleus lateralis tuberis (NLT) pars posterior and the NLT pars anterior which are situated in the pituitary stalk, are actively take part in regulation of GTH secretion for gonadal recrudescence (Fig. doi: 10.11233/aquaculturesci1953.44.487, 382. p. 13–23. Our results, however, suggest that the thyroid hormone conjugates in tilapia plasma are involved in the excretion of thyroid hormones, through routes other than bile. These two outgrowths are thus ectodermal in origin and enclose mesoderm in between them, which later on supply blood to the pituitary gland, originating from the inter-renal carotid artery. The thyroid gland is a butterfly-shaped structure that sits slightly below the larynx, anterior to the trachea. These cookies track visitors across websites and collect information to provide customized ads. Environ Health Perspect (2007) 115(8):1197–203. The thyroid gland secretes primarily two hormones which are Triiodothyronine (T3) hormone and the Thyroxine hormone (T4). However, problems can occur with the thyroid, forcing some individuals to get placed on medications. Rome, ITL: FAO (2018). Some foods have developed a terrible reputation for affecting thyroid function. Thyroid gland receives signals from the TSH and TRH hormones released by the pituitary gland. Soyano K, Saito T, Nagae M, Yamauchi K. Effects of thyroid hormone on gonadotropin–induced steroid production in medaka, Oryzias latipes, ovarian follicles. Power DM, Elias NP, Richardson SJ, Mendes J, Soares CM, Santos CRA. Lamprey metamorphosis: Thyroid hormone signaling in a basal vertebrate. Growth hormone is thyrotropic in Fundulus heteroclitus. The physiology of smolting salmonids. Brown DD. THs consist of two forms, thyroxine (or tetraiodothyronine, T4) and the biologically active triiodothyronine (T3) (18). doi: 10.1051/jbio/2019010, 204. 225. doi: 10.1621/nrs.04020, 110. Kelly G. Peripheral metabolism of thyroid hormones: A review. doi: 10.1016/0300-9629(88)90433-1, 296. Growth hormones, somatotropin (actually they are not tropic). In early mammalian development, an embryo relies solely on maternal THs as its thyroid gland is not yet fully functional (121). doi: 10.1007/s11154-016-9395-7, 281. Maintenance of thyroid activity with some steroids in hypophysectomized and gonadectomized catfish, Mystus vittatus (Bloch). Am Zoologist (2015) 21(2):473–515. Leung LY, Kwong AKY, Man AKY, Woo NYS. doi: 10.1111/jne.12590. Comp Biochem Physiol Part C: Toxicol Pharmacol (2005) 141(1):8–14. Smoltification Physiology in the Culture of Salmonids. Hypothalamic and thyroidal regulation of growth hormone in tilapia. In Tilapia mossambica and Carassius auratus the TSH cells have direct contact with endings containing elementary neurosecretory granules, and with endings containing vesicles having dense granules. doi: 10.1016/j.aquatox.2006.12.003, 273. Godwin J, Phillips M. Modes of Reproduction in Fishes. Histology: The thyroid gland is composed of a large number of follicles forming a shape of a hollow ball and consisting of a single layer of epithelial cells that encloses a fluid filled space. The hypothalamic–pituitary–thyroid axis: physiological regulation and clinical implications. Q Rev Biol (1951) 26(2):123–68. The Thyroid Gland in Animals. doi: 10.1046/j.1365-2605.2000.00233.x, 231. |, Mechanism of Action and General Actions of Thyroid Hormones, Role of the Thyroid Axis on Somatic Development and Growth, Role of Thyroid Hormones in Osmoregulation, Relevance of the Thyroid Axis in Aquaculture, https://doi.org/10.3389/fendo.2020.596585, http://researcharchive.calacademy.org/research/ichthyology/catalog/fishcatmain.asp, Creative Commons Attribution License (CC BY), Departments of Biology and Biochemistry, Memorial University of Newfoundland, St. John’s, NL, Canada. doi: 10.1007/7854_2018_54, 308. LH and FSH of mammals. The ultimo-branchial gland is under the control of pituitary gland. In fish, T2 regulates the transcription of genes associated with cell signalling and transcriptional pathways in the liver of Nile tilapia (Oreochromis niloticus) (116) and stimulates mitochondrial respiration of liver and muscle in goldfish (117).

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