Preparation and Administration of Gonadotropin-Releasing Hormone Agonist (GnRHa) Implants for the Artificial Control of Reproductive Maturation in Captive-Reared Atlantic Bluefin Tuna (<i>Thunnus thynnus thynnus</i>)

Mylonas, Constantinos C.; Bridges, C.R.; Gordin, H.; Ríos, Antonio Belmonte; Garcı́a, Antonio G.; Gándara, Fernando de la; Fauvel, Christian; Suquet, Marc; Medina, Antonio; Papadaki, Maria; Heinisch, Gilad; Metrio, G. De; Corriero, Aldo; Robert, Vincent; Guzmán, Jose-María; Mañanós, Evaristo L.; Zohar, Yonathan

doi:10.1080/10641260701484572

Cited by 94 publications

(74 citation statements)

References 55 publications

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“…Similarly, Yaragina (13) recently consulted macroscopic staging information on Northeast Arctic cod (Gadus morhua) (NEAC) and estimated the proportion of fish of uncertain maturity status (i.e., putative, but not certain, skippers) to constitute up to 21% of the sexually mature fraction in the years 1984-2006. Unequivocal evidence of past spawning is provided by the presence of postovulatory follicles (POFs) in female gonads (4), but typically POFs are ephemeral and may last for only 1 d after spawning (14). In cod, POFs persist for more than 1 y (15), providing a unique marker of past spawning.…”

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Frequent skipped spawning in the world’s largest cod population

Skjæraasen

Nash

Korsbrekke

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

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Life-history theory suggests that animals may skip reproductive events after initial maturation to maximize lifetime fitness. In iteroparous teleosts, verifying past spawning history is particularly difficult; the degree of skipped spawning at the population level therefore remains unknown. We unequivocally show frequent skipped spawning in Northeast Arctic cod (NEAC) in a massive field and laboratory effort from 2006 to 2008. This was verified by postovulatory follicles in temporarily arrested ovaries close to the putative spawning period. At the population level, "skippers" were estimated to be approximately equally abundant as spawning females in 2008, constituting ∼24% of the females 60-100 cm. These females never truly started vitellogenesis and principally remained on the feeding grounds when spawners migrated southward, avoiding any migration costs. The proximate cause of skipping seems to be insufficient energy to initiate oocyte development, indicating that skipped spawning may partly be a density-dependent response important in population regulation. Our data also indicate more skipping among smaller females and potential tradeoffs between current and future reproductive effort. We propose that skipped spawning is an integral life-history component for NEAC, likely varying annually, and it could therefore be an underlying factor causing some of the currently unexplained large NEAC recruitment variation. The same may hold for other teleosts.codfish | population dynamics | reproductive biology | total egg production | stock reproductive potential P opulation demography changes according to reproduction and mortality. In high latitude marine ectotherms, including teleosts, survival of the youngest age classes varies substantially, resulting in large fluctuations in population size (1). Historic spawning stock biomass (SSB) is used to forecast future fish recruitment, although the amount of unexplained variation indicates that SSB may not accurately reflect offspring production (2, 3). One factor that could significantly impact egg production is skipped spawning-the failure of iteroparous spawners to use each spawning opportunity after sexual maturity sensu (4). For most teleosts this phenomenon and its impact on population demography has received scant attention, but theoretical models indicate that up to 30% of the mature individuals may skip spawning and that it is an adaptive strategy optimizing lifetime fitness (5). To date, skipped spawning has been documented in more than 30 species (4, 6), including freshwater (7), marine (8), and anadromous teleosts (9). It has been documented for fish with both indeterminate and determinate fecundity and sequential hermaphrodites (6) and in species with as diverse life histories as the European horse mackerel Trachurus trachurus (10) and the orange roughy Hoplostethus atlanticus (8). Given the difficulty in conclusively establishing past spawning, reports of skipped spawning in teleosts are commonly anecdotal (4).The major process of energy transfer and oocyte gr...

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confidence: 99%

“…Unequivocal evidence of past spawning is provided by the presence of postovulatory follicles (POFs) in female gonads (4), but typically POFs are ephemeral and may last for only 1 d after spawning (14). In cod, POFs persist for more than 1 y (15), providing a unique marker of past spawning.…”

mentioning

confidence: 99%

Frequent skipped spawning in the world’s largest cod population

Skjæraasen

Nash

Korsbrekke

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

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“…Recently, spawning of Atlantic bluefin tuna (Thunnus thynnus) reared in captivity in the Mediterranean has been obtained by the administration of a GnRH agonist (Corriero et al, 2007;Mylonas et al, 2007).…”

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confidence: 99%

Brain morphology and immunohistochemical localization of the gonadotropin-releasing hormone in the bluefin tuna, Thunnus thynnus

Palmieri¹,

Acone²,

Desantis³

et al. 2009

Eur J Histochem

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The present study was focused on the morphology of the diencephalic nuclei (likely involved in reproductive functions) as well as on the distribution of GnRH (gonadotropin-releasing hormone) in the rhinencephalon, telencephalon and the diencephalon of the brain of bluefin tuna (Thunnus thynnus) by means of immunohistochemistry. Bluefin tuna has an encephalization quotient (QE) similar to that of other large pelagic fish. Its brain exhibits well-developed optic tecta and corpus cerebelli. The diencephalic neuron cell bodies involved in reproductive functions are grouped in two main nuclei: the nucleus preopticus-periventricularis and the nucleus lateralis tuberis. The nucleus preopticus-periventricularis consists of the nucleus periventricularis and the nucleus preopticus consisting of a few sparse multipolar neurons in the rostral part and numerous cells closely packed and arranged in several layers in its aboral part. The nucleus lateralis tuberis is located in the ventral-lateral area of the diencephalon and is made up of a number of large multipolar neurones. Four different polyclonal primary antibodies against salmon (s)GnRH, chicken (c)GnRH-II (cGnRH-II 675, cGnRH-II 6) and sea bream (sb)GnRH were employed in the immunohistochemical experiments. No immunoreactive structures were found with anti sbGnRH serum. sGnRH and cGnRH-II antisera revealed immunoreactivity in the perikarya of the olfactory bulbs, preopticus-periventricular nucleus, oculomotor nucleus and midbrain tegmentum. The nucleus lateralis tuberis showed immunostaining only with anti-sGnRH serum. Nerve fibres immunoreactive to cGnRH and sGnRH sera were found in the olfactory bulbs, olfactory nerve and neurohypophysis. The significance of the distribution of the GnRHimmunoreactive neuronal structures is discussed.

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“…Tidak ada perbedaan ukuran diameter telur yang nyata pada setiap bulan walaupun terlihat bahwa pada bulan November dan Desember telur cenderung lebih kecil dibandingkan bulan-bulan lainnya, di daerah sub tropis ukuran telur sangat dipengaruhi oleh suhu perairan, di mana semakin tinggi suhu air pada saat pemijahan maka diameter telur akan lebih kecil (Masuma, 2009). Ternyata ukuran diameter telur ikan tuna sirip biru relatif lebih besar yaitu sekitar 1 mm dengan butiran minyak 250 µm atau dengan rasio 25% (Mylonas et al, 2007). Sementara hasil penelitian pada ikan tuna sirip kuning ini menunjukkan rasio antara butiran minyak dengan diameter telur hanya 18%-21%.…”

Section: (Jhon Harianto Hutapea)unclassified

PERFORMA PEMIJAHAN IKAN TUNA SIRIP KUNING, Thunnus albacares DI KERAMBA JARING APUNG

Hutapea¹,

Setiadi²,

Gunawan³

et al. 2017

Jurnal Riset Akuakultur

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ABSTRAKIkan tuna sirip kuning merupakan komoditas ekspor yang bernilai ekonomis tinggi yang populasinya semakin menurun di alam. Penelitian ini dilaksanakan di Balai Besar Penelitian dan Pengembangan Budidaya Laut, Gondol dan bertujuan untuk mengetahui performa pemijahan ikan tuna sirip kuning yang dipelihara di dalam keramba jaring apung. Sebanyak 100 ekor induk ikan tuna dengan ukuran bobot sekitar 15-30 kg dipelihara dalam keramba sejak tahun 2014. Induk ikan diberi pakan berupa ikan layang dan cumi-cumi dengan rasio 2:1 dua kali sehari (pagi dan sore hari). Pengamatan yang dilakukan meliputi tingkah laku induk, pemijahan, dan keragaan telur yang dihasilkan, serta kualitas air terutama suhu dan oksigen dilakukan setiap hari. Induk ikan memijah untuk pertama kalinya terjadi pada tahun 2015. Selanjutnya pemijahan terjadi hampir setiap malam hari dengan jumlah telur yang dapat dikumpulkan berkisar 30.000-3.600.000 butir. Daya tetas telur yang diperoleh berkisar 26%-96%, dengan ketahanan hidup larva tanpa pakan (survival activity index-SAI) berkisar 0,1-3,8. Berdasarkan hasil pengamatan ini dapat disimpulkan bahwa induk ikan tuna sirip kuning umur dua tahun dapat memijah di keramba jaring apung dan menghasilkan performa pemijahan yang baik.

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Preparation and Administration of Gonadotropin-Releasing Hormone Agonist (GnRHa) Implants for the Artificial Control of Reproductive Maturation in Captive-Reared Atlantic Bluefin Tuna (Thunnus thynnus thynnus)

Cited by 94 publications

References 55 publications

Frequent skipped spawning in the world’s largest cod population

Frequent skipped spawning in the world’s largest cod population

Brain morphology and immunohistochemical localization of the gonadotropin-releasing hormone in the bluefin tuna, Thunnus thynnus

PERFORMA PEMIJAHAN IKAN TUNA SIRIP KUNING, Thunnus albacares DI KERAMBA JARING APUNG

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