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Chengyuan Lin, Xue Jiang, Mulan He, Ling Zhao, Tao Huang, Zhaoxiang Bian and Anderson O L Wong

transduction for PRL regulation by PACAP in lower vertebrates, including fish species. In our recent studies, grass carp prl has been cloned and its expression in the pars distalis of the carp pituitary has been confirmed ( Lin et al . 2015 ). Besides, nerve

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Xue Jiang, Jia Xiao, Mulan He, Ani Ma and Anderson O L Wong

shed light on the role of SOCS in GH functions in fish model, type II SOCS, including Socs1–3 and Cish, were cloned in grass carp and their gene copy number and tissue expression, especially in the liver, were determined. Using carp hepatocytes, the

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B. I. SUNDARARAJ, T. C. ANAND and V. R. P. SINHA

SUMMARY

Carp pituitary extracts obtained from the puntius carp, Puntius gonio-notus, the grass carp, Ctenopharyngodon idellus, and the big head carp, Aristichthys nobilis, were subjected to gel filtration on Sephadex G-100. The water-soluble proteins in the pituitary extracts resolved into three distinct components, referred to as fractions I, II and III. They were tested for their gonadotrophic activity in the female catfish, Heteropneustes fossilis, by evaluating ovarian maintenance and ovulation in hypophysectomized gravid specimens during the spawning season (July—August), and the induction of oogenesis and vitellogenesis in the regressed ovaries of hypophysectomized specimens during the preparatory period (February). Daily treatment with the puntius carp pituitary fraction II (100 or 300 μg) reinitiated and restored oogenesis and vitellogenesis. The grass carp pituitary fraction II (300 μg) induced vitellogenesis but its potency was much less than that of the puntius carp pituitary fraction II. The big head carp pituitary fraction II was ineffective. Daily treatment with the puntius carp pituitary fraction II (1 or 5 μg) maintained the yolky oocytes in the gravid ovaries and prevented atresia. Ovulation and spawning were induced in hypophysectomized gravid catfish by a single dose of the puntius carp pituitary fraction II (100 or 150 μg). The first and third fractions from the three species of carps were ineffective. Thus, all the reproductive processes in the hypophysectomized female catfish were initiated and/or maintained solely by the puntius carp pituitary fraction II.

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Mio Tanaka, Morio Azuma, Yumika Nejigaki, Yumiko Saito, Kanta Mizusawa, Minoru Uchiyama, Akiyoshi Takahashi, Seiji Shioda and Kouhei Matsuda

Sl-α and -β synthesis in the goldfish pituitary. In grass carp, Sl-α is a dominant form ( Jiang et al . 2008 b ) but the cause for discrepancy on relative abundance of the two molecular forms is unclear and may be related to species

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Juana Maria Lugo, Alina Rodriguez, Yusmila Helguera, Reynold Morales, Osmany Gonzalez, Jannel Acosta, Vladimir Besada, Aniel Sanchez and Mario Pablo Estrada

stimulation of GH release from goldfish ( Carassius auratus ) ( Wong et al . 1998 ), eel ( Montero et al . 1998 ), and grass carp ( Ctenopharyngodon idellus ) ( Sze et al . 2007 ) pituitary cells. In this study, C. gariepinus PRP and PACAP were able to

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Esther Isorna, Nuria de Pedro, Ana I Valenciano, Ángel L Alonso-Gómez and María J Delgado

leptin rhythm in the goldfish liver is related to plasma glucose levels ( Tinoco et al. 2014 ), with a postprandial glucose peak preceding the leptin peak, supporting the notion that leptin is induced by glucose in the hepatocytes of grass carp

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Erin Faught, Lynsi Henrickson and Mathilakath M Vijayan

ed 182 – 201 Leatherl JF Woo P . Oxfordshire, UK : CABI . Zhang A Zhou X Wang X Zhou H 2011 Characterization of two heat shock proteins (Hsp70/Hsc70) from grass carp ( Ctenopharyngodon idella ): evidence for their

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Diego Safian, Eduardo N Fuentes, Juan Antonio Valdés and Alfredo Molina

.1073/pnas.96.12.7088 . Sun C Tao Y Jiang X Zou S 2011 IGF binding protein 1 is correlated with hypoxia-induced growth reduce and developmental defects in grass carp ( Ctenopharyngodon idellus ) embryos . General and Comparative Endocrinology

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Ting Chen, Zhiguo Tang, Aifen Yan, Wensheng Li and Haoran Lin

perifused pituitary cells of chinese grass carp, Ctenopharyngodon idellus . General and Comparative Endocrinology 110 29 – 45 . Wong AO Zhou H Jiang Y Ko WK 2006 Feedback regulation of growth hormone synthesis and secretion in fish and the

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David A Baltzegar, Benjamin J Reading, Jonathon D Douros and Russell J Borski

Comparative Endocrinology 161 229 – 237 . ( doi:10.1016/j.ygcen.2009.01.008 ) Li GG Liang XF Xie Q Li G Yu Y Lai K 2010 Gene structure, recombinant expression and functional characterization of grass carp leptin . General and Comparative