Serum levels of reproductive steroid hormones in captive sand tiger sharks, Carcharias taurus (Rafinesque), and comments on their relation to sexual conflicts.


:Levels of reproductively-related steroids were determined in captive male sand tiger sharks, Carcharias taurus, maintained at two institutions: SeaWorld Adventure Park Orlando and the National Aquarium in Baltimore. Sexual conflicts were absent at the former, but were documented at the latter. Serum titers of 17beta-estradiol, progesterone, testosterone, and 5alpha-dihydrotestosterone were determined via radioimmunoassay in adult male sharks from 1988 to 2000. Sampling overlap between the two institutions occurred for 3 months of the year, but steroid concentrations were compared only for April due to the occurrence of sexual conflicts in the sharks at the National Aquarium in Baltimore in that month. For April, testosterone and dihydrotestosterone were significantly higher in the SeaWorld males, and progesterone was significantly higher in the National Aquarium in Baltimore males, while estradiol was not significantly different. Steroid levels were also determined from serial samples taken monthly over 17 months from three male sharks and one female shark at the National Aquarium in Baltimore in 2001-2002 and were compared with corresponding observed sexual conflicts. The steroid levels obtained showed distinct annual hormonal cycles in the male sharks and corroborated a biennial cycle for the single serially-sampled female shark. Furthermore, the steroid levels for individual males correlated with sexual conflicts as well as their position within the male dominance hierarchy. As this species is depleted in some regions globally, insight into the steroid profile of mature sand tiger sharks is important for a greater understanding of the relationship between their reproductive physiology and behavior, and may aid in captive management and reproduction.


Fish Physiol Biochem


Henningsen AD,Murru FL,Rasmussen LE,Whitaker BR,Violetta GC




Has Abstract


2008-12-01 00:00:00












  • Control of ion transport by the sperm duct epithelium of brook trout (Salvelinus fontinalis).

    abstract::The sperm duct epithelium of brook trout (Salvelinus fontinalis), mountedin vitro in Ussing-style epithelial chambers actively absorbs Na(+) (measured as the short-circuit current, Isc) and secretes K(+) (measured using(86)Rb(+) as tracer). Dibutyryl-cyclic-adenosine monophosphate (db-cAMP) and 3-isobutyl-1-methylxant...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Marshall WS,Bryson SE,Idler DR

    更新日期:1989-06-01 00:00:00

  • Identification of Wap65, a human homologue of hemopexin as a copper-inducible gene in swordtail fish, Xiphophorus helleri.

    abstract::Copper is one of the major heavy metal pollutants found in the aquatic environment. Therefore, it is important for determining the genes that play a key role in copper metabolism in aquatic organisms. This study, thus, aimed to identify a new copper-inducible gene in swordtail fish, Xiphophorus helleri. Using ACP-base...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Aliza D,Ismail IS,Kuah MK,Shu-Chien AC,Tengku Muhammad TS

    更新日期:2008-06-01 00:00:00

  • Pre-spawning water temperature affects sperm respiration and reactivation parameters in male carps.

    abstract::Concentration, ability to motility, motility during the second activation (reactivation), and endogenous respiration were studied in sperm from two experimental groups of carp males. Group 1 was maintained for 7 days at 15 degrees C (cold water (CW) group), whereas the second group was subjected to a temperature of 20...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Boryshpolets S,Dzyuba B,Drokin S

    更新日期:2009-11-01 00:00:00

  • Expressions and characterization of MuRFs, Atrogin-1, F-box25 genes in tilapia, Oreochromis niloticus, in response to starvation.

    abstract::Muscle accretion is affected by the difference between protein synthesis and its degradation. Studies on different species revealed that muscle proteolysis is mediated by different pathways including the ubiquitin-proteasome pathway in which the ubiquitin protein ligases play an important role. These muscle atrophy as...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Shaalan WM,El-Hameid NAA,El-Serafy SS,Salem M

    更新日期:2019-08-01 00:00:00

  • Is it possible to store spotted wolffish (Anarhichas minor) sperm by refrigeration?

    abstract::Spotted wolffish Anarhichas minor reproduction in captivity is dependent on in vitro fertilization. However, it is often challenging to acquire sufficient fresh sperm to fertilize the eggs that are obtained. In this study, we evaluate the possibility to store spotted wolffish sperm by refrigeration. Spotted wolffish s...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: González-López WA,Patel DM,Duncan N,Beirão J

    更新日期:2020-06-02 00:00:00

  • Tissue-specific daily variation in the oxidative status of sturgeon (Acipenser naccarii) and rainbow trout (Oncorhynchus mykiss): a comparative study.

    abstract::The oxidative status is associated with animal lifespan, metabolism, activity and circadian rhythms. The objective of this work is to study the time course of the oxidative status over a daily cycle in the plasma, liver and brain, and the changes in the plasma cortisol levels of sturgeon and trout. The knowledge of da...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Hidalgo MC,Trenzado CE,Furné M,Beltrán A,Manzaneda C,García-Gallego M,Domezain A,Sanz A

    更新日期:2017-08-01 00:00:00

  • Cardiovascular, respiratory, and blood adjustments to hypoxia in the Japanese eel,Anguilla japonica.

    abstract::The cardioventilatory performance of the Japanese eel,Anguilla japonica, was evaluated during acute exposure to hypoxia. The eel became an oxygen conformer as ambient PO2 fell below the critical value of 110 mmHg. Although arterial and venous PO2 also fell progressively, the arterial O2 content remained constant down ...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Chan DK

    更新日期:1986-10-01 00:00:00

  • Critical role of connexin43 in zebrafish late primitive and definitive hematopoiesis.

    abstract::In vitro studies have suggested that connexin43 (cx43) expression is of particular importance during establishment and regeneration of the mammalian hematopoietic system. However, little is known about its in vivo functions during hematopoiesis due to the embryonic lethality of mammalian knockout models. In this study...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Jiang Q,Liu D,Sun S,Hu J,Tan L,Wang Y,Gui Y,Yu M,Song H

    更新日期:2010-12-01 00:00:00

  • The effect of cortisol administration on blood plasma immunoglobulin M (IgM) concentrations in masu salmon (Oncorhynchus masou).

    abstract::Immunoglobulin M (IgM) is known as a main factor in the humoral immune system of teleosts. In the present study, the effect of cortisol on plasma IgM concentrations was investigated using a specific antibody to IgM in masu salmon (Oncorhynchus masou). Cortisol was orally administered each day for 2 weeks at a dose of ...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Nagae M,Fuda H,Ura K,Kawamura H,Adachi S,Hara A,Yamauchi K

    更新日期:1994-05-01 00:00:00

  • Immunostimulatory effect of salmon prolactin on expression of Toll-like receptors in Oncorhynchus mykiss infected with Piscirickettsia salmonis.

    abstract::In aquaculture, antibiotics are the traditional treatment used against bacterial infections. However, their use has increasingly come into question given their effects on fish and, possibly, on human health. Consequently, there is interest in developing alternative treatments aimed at stimulating the innate immune res...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Peña B,Isla A,Haussmann D,Figueroa J

    更新日期:2016-04-01 00:00:00

  • Catalytic activity and immunochemical quantification of hepatic cytochrome P-450 in β-naphthoflavone and isosafrol treated rainbow trout (Oncorhynchus mykiss).

    abstract::In addition to catalytical assays, immunochemical techniques have recently been employed to measure induction of the cytochrome P-450 (P450) monooxygenase system in fish with polyaromatic hydrocarbons (PAH). In the present study, polyclonal antibodies were raised against rainbow trout P450IA1. Levels of rainbow trout ...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Celander M,Förlin L

    更新日期:1991-06-01 00:00:00

  • Gill morphometry of the facultative air-breathing loricariid fish,Hypostomus plecostomus (Walbaum) with, special emphasis on aquatic respiration.

    abstract::Gill respiratory surface area and oxygen consumption during aquatic respiration were measured in the facultative air-breathing loricariid fish,Hypostomus plecostomus. The fish did not surface to breathe atmospheric air in normoxic water; air-breathing was evoked by environmental hypoxia (water oxygen tension=35±2, mmH...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Aparecida Perna S,Fernandes MN

    更新日期:1996-06-01 00:00:00

  • GRP94 is encoded by two differentially expressed genes during development of rainbow trout (Oncorhynchus mykiss).

    abstract::The glucose-regulated protein, 94 kDa (GRP94), is an endoplasmic reticulum (ER)-localized heat shock protein that plays among other functions a crucial role in folding and exports of Toll-like receptors (TLRs) and some other immune-relevant factors. We identified two copies of the GRP94-encoding gene in rainbow trout ...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Rebl A,Brietzke A,Goldammer T,Seyfert HM

    更新日期:2014-12-01 00:00:00

  • Transferrin mRNA in relation to liver iron storage in farmed Atlantic salmonSalmo salar.

    abstract::Transferrin mRNA in liver was quantified in farmed Atlantic salmon (Salmo salar) fed three different levels (310-, 65-, and 40 ppm) of dietary iron for 26 weeks. At the time of sampling, the fish fed 40 ppm iron showed symptoms of iron deficiency. Mean values of liver storage iron was reduced from 84 to 12 mg kg(-1) a...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Kvingedal AM,Dehli A,Rørvik KA

    更新日期:1996-08-01 00:00:00

  • Iron exposure modifies acetylcholinesterase activity in zebrafish (Danio rerio) tissues: distinct susceptibility of tissues to iron overload.

    abstract::Iron is one the most abundant metals on the earth being essential for living organisms even though its free form can be toxic. The overload of this metal may be related with some disorders, like Alzheimer and Parkinson diseases, and hemochromatosis in the liver. The aim of the present study was to evaluate the effects...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Sant'Anna MC,Soares Vde M,Seibt KJ,Ghisleni G,Rico EP,Rosemberg DB,de Oliveira JR,Schröder N,Bonan CD,Bogo MR

    更新日期:2011-09-01 00:00:00

  • Level of in vitro storage of the European catfish (Silurus glanis L.) eggs at different temperatures.

    abstract::European catfish (Silurus glanis) is a commercially important freshwater fish originating from Eastern Europe. The objective of this study was to examine the short-term storage of its eggs especially in relation to maintaining a low level of malformation in newly hatched fry. The eggs from freshly spawned individuals ...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Tinkir M,Memiş D,Cheng Y,Xin M,Rodina M,Gela D,Tučková V,Linhart O

    更新日期:2020-11-26 00:00:00

  • Molecular cloning of Foxl2 gene and the effects of endocrine-disrupting chemicals on its mRNA level in rare minnow, Gobiocypris rarus.

    abstract::Endocrine-disrupting chemicals (EDCs) can affect normal sexual differentiation in fish. Foxl2, one forkhead transcription factor, plays an important role in ovarian differentiation in the early development of the female gonad in mammals and fish. How EDCs affect Foxl2 expression is little known. In this study, we isol...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Wang H,Wu T,Qin F,Wang L,Wang Z

    更新日期:2012-06-01 00:00:00

  • Toxicity and accumulation of zinc pyrithione in the liver and kidneys of Carassius auratus gibelio: association with P-glycoprotein expression.

    abstract::Zinc pyrithione (ZPT) is a broad-spectrum antibacterial and antifungal agent; therefore, it is widely used in industry and civilian life. It is discharged into the aquatic environment with industrial and civilian waste water. Carassius sp. is one of the most widely distributed and farmed fish in China. The effects of ...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Ren T,Fu GH,Liu TF,Hu K,Li HR,Fang WH,Yang XL

    更新日期:2017-02-01 00:00:00

  • Purification and partial characterization of vitellogenin from shorthead redhorse (Moxostoma macrolepidotum) and copper redhorse (Moxostoma hubbsi) and detection in plasma and mucus with a heterologous antibody.

    abstract::Vitellogenin (VTG), the egg yolk precursor protein, was purified from plasma of estradiol-3-benzoate (E2B)-treated male shorthead redhorse (Moxostoma macrolepidotum) and immature copper redhorse (Moxostoma hubbsi) by a two-step chromatographic procedure without precipitation. Intact VTGs appeared as dimers with appare...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Maltais D,Roy RL

    更新日期:2009-06-01 00:00:00

  • An overview of functional and stereological evaluation of spermatogenesis and germ cell transplantation in fish.

    abstract::Although there are almost thirty-thousand species of fish living in a great variety of habitats and utilizing vast reproductive strategies, our knowledge of morphofunctional and quantitative aspects of testis structure and spermatogenesis is still incipient for this group of vertebrates. In this review, we discuss asp...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章,评审


    authors: Nóbrega RH,Batlouni SR,França LR

    更新日期:2009-03-01 00:00:00

  • Changes in levels of GnRH in the brain and pituitary and GTH in the pituitary in male masu salmon, Oncorhynchus masou, from hatching to maturation.

    abstract::Levels of two types of gonadotropin-releasing hormone (salmon GnRH and chicken GnRH-II) in the brain and pituitary, and content of gonadotropin (GTHIβ and IIβ) in the pituitary were measured in male masu salmon from hatching to gonadal maturation for three years in order to clarify the involvement of GnRHs in precocio...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Amano M,Aida K,Okumoto N,Hasegawa Y

    更新日期:1993-07-01 00:00:00

  • Morpho-histology of head kidney of female catfish Heteropneustes fossilis: seasonal variations in melano-macrophage centers, melanin contents and effects of lipopolysaccharide and dexamethasone on melanins.

    abstract::In the catfish Heteropneustes fossilis, the anterior kidney is a hemopoietic tissue which surrounds the adrenal homologues, interrenal (IR) and chromaffin tissues corresponding to the adrenal cortical and adrenal medulla of higher mammals. The IR tissue is arranged in cell cords around the posterior cardinal vein (PCV...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Kumar R,Joy KP,Singh SM

    更新日期:2016-10-01 00:00:00

  • Influence of nucleoside triphosphates, inorganic salts, NADH, catecholamines, and oxygen saturation on nitrite-induced oxidation of rainbow trout haemoglobin.

    abstract::Oxidation of rainbow trout haemoglobin (Hb) by nitrite proceeded via an initial lag phase followed by autocatalysis when the O2 saturation of the Hb was high. At low O2 saturations, the rate of methaemoglobin (metHb) formation was strongly reduced and autocatalysis was absent. Addition of adenosine triphosphate and gu...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Jensen FB

    更新日期:1993-08-01 00:00:00

  • Assessment of enzymatic efficiency on protein digestion in the tilapia Oreochromis niloticus.

    abstract::The present study develops an experimental procedure aimed to estimate the efficiency of protein digestion in fish by measuring both gut transit rate and total amount of the main intestinal proteases (trypsin and chymotrypsin). The selected species was the Nile tilapia (Oreochromis niloticus). Total time for digestion...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Uscanga A,Moyano FJ,Alvarez CA

    更新日期:2010-12-01 00:00:00

  • Effect of xylan oligosaccharides generated from corncobs on food acceptability, growth performance, haematology and immunological parameters of Dicentrarchus labrax fingerlings.

    abstract::The objective of this study was to determine the effect of two levels of inclusion of xylan oligosaccharides (XOS) extracted from corncob on growth, feed utilization, immune status and disease resistance of Mediterranean sea bass (Dicentrarchus labrax) fingerlings. Specimens of 4.75 ± 0.69 g at initial density of 2.7 ...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Abdelmalek BE,Driss D,Kallel F,Guargouri M,Missaoui H,Chaabouni SE,Ayadi MA,Bougatef A

    更新日期:2015-12-01 00:00:00

  • Establishment and characterization of fin cell lines from diploid, triploid, and tetraploid oriental weatherfish (Misgurnus anguillicaudatus).

    abstract::Continuous fin cell lines from diploid, triploid, and tetraploid oriental weatherfish, Misgurnus anguillicaudatus, were established and characterized. The cell lines, designated DIMF, TRMF, and TEMF, respectively, were subcultured more than 80 times since initiation in October 2012 and were preserved at the China Cent...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Li X,Ma C,Qin YJ,Li YJ,Wu D,Bai LW,Pei AJ

    更新日期:2015-06-01 00:00:00

  • Utilization of an endocrine growth index, insulin-like growth factor binding protein (IGFBP)-1b, for postsmolt coho salmon in the Strait of Georgia, British Columbia, Canada.

    abstract::Monitoring the growth of salmon during their early marine phase provides insights into prey availability, and growth rates may be linked to risks of size-dependent mortality. However, the measurement of growth rate is challenging for free-living salmon in the ocean. Insulin-like growth factor (IGF)-I is a growth-promo...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Kaneko N,Journey ML,Neville CM,Trudel M,Beckman BR,Shimizu M

    更新日期:2019-12-01 00:00:00

  • Effect of different salinities on gene expression and activity of digestive enzymes in the thick-lipped grey mullet (Chelon labrosus).

    abstract::The effects of different environmental salinities (0, 12, 40, and 55 ppt) on pepsinogen 2 (pga2), trypsinogen 2 (try2), chymotrypsinogen (ctr), and pancreatic alpha-amylase (amy2a) gene expression, and on the total activities of their corresponding enzymes, were assessed in Chelon labrosus juveniles, after their corre...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章,评审


    authors: Pujante IM,Moyano FJ,Martos-Sitcha JA,Mancera JM,Martínez-Rodríguez G

    更新日期:2018-02-01 00:00:00

  • Developmental changes in digestive enzyme activity in American shad, Alosa sapidissima, during early ontogeny.

    abstract::In order to assess the digestive physiological capacity of the American shad Alosa sapidissima and to establish feeding protocols that match larval nutritional requirements, we investigated the ontogenesis of digestive enzymes (trypsin, amylase, lipase, pepsin, alkaline phosphatase, and leucine aminopeptidase) in larv...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Gao XQ,Liu ZF,Guan CT,Huang B,Lei JL,Li J,Guo ZL,Wang YH,Hong L

    更新日期:2017-04-01 00:00:00

  • Regulation of interrenal function in freshwater and sea water adapted tilapia (Oreochromis mossambicus).

    abstract::In teleosts, cortisol is one of the key factors regulating the adaptation to environmental challenges, such as salinity changes. This paper compares interrenal function between fully adapted freshwater (FW) and sea water (SW) specimens of the euryhaline teleost Oreochromis mossambicus (tilapia), combining morphometric...

    journal_title:Fish physiology and biochemistry

    pub_type: 杂志文章


    authors: Balm PH,Haenen HE,Wendelaar Bonga SE

    更新日期:1995-02-01 00:00:00