نتایج جستجو برای: induced spawning

تعداد نتایج: 985695  

2002
Michael K. Young Thomas A. Wesche Wayne A. Hubert MICHAEL K. YOUNG A. WESCHE

-To measure the changes in substrate composition produced by spawning brook trout Salvefinus fontinalis, we collected 187 freeze-core samples, both before and after spawning, from egg pockets, inside redds but excluding egg pockets, and outside redds. In the upper strata of reddassociated samples, we found that the proportions of particles 0.85-1.70,0.425-0.85,0.2 12-0.425, and less than 0.212 ...

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2016
Per G. Henriksen Kristian Beedholm Erik Baatrup

Reproductive success manifested by spawning and fertilization, in most fish, depends partly on an appropriate courtship behavior by both sexes. The zebrafish reproductive behavior can be resolved in some of its constituent elements by a computerized vision system and described in unbiased quantitative terms. Pairs of adult male and female zebrafish were monitored with automatic video tracking a...

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Journal: :Aquaculture Reports 2021

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Journal: :Marine ecology progress series 2005
Richard S Nemeth

Many species of groupers form spawning aggregations, dramatic events where 100s to 1000s of individuals gather annually at specific locations for reproduction. Spawning aggregations are often targeted by local fishermen, making them extremely vulnerable to over fishing. The Red Hind Bank Marine Conservation District located in St. Thomas, United States Virgin Islands, was closed seasonally in 1...

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Journal: :Moscow University Biological Sciences Bulletin 2022

Non-random mating plays a key role in speciation and impacts the individual life history. Body size is known to be one of most important traits on which mate choice based. Various patterns body preference are fish, but they have been studied limited number species. Although climbing perch (Anabas testudineus) widespread well known, few reports its spawning published. Moreover, breeding has only...

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Journal: : 2022

The biological aspects for the semen of males (Cyprinus carpio) were assessed during spawning season, after they artificially induced spawning. insemination by injecting with Ovaprim and pituitary gland extract. Two dosages had been used 0.5, 0.3 ml 2,4 mg per Kg body weight respectively. After that volume semen, pH, number sperms in one motility estimated. total obtained from ranged between (7...

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Journal: :Annales de Biologie Animale Biochimie Biophysique 1978

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2017
Nicholas A Farmer William D Heyman Mandy Karnauskas Shinichi Kobara Tracey I Smart Joseph C Ballenger Marcel J M Reichert David M Wyanski Michelle S Tishler Kenyon C Lindeman Susan K Lowerre-Barbieri Theodore S Switzer Justin J Solomon Kyle McCain Mark Marhefka George R Sedberry

Managed reef fish in the Atlantic Ocean of the southeastern United States (SEUS) support a multi-billion dollar industry. There is a broad interest in locating and protecting spawning fish from harvest, to enhance productivity and reduce the potential for overfishing. We assessed spatiotemporal cues for spawning for six species from four reef fish families, using data on individual spawning con...

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Journal: :Management Science 2013
Michel A. Habib Ulrich Hege Pierre Mella-Barral

We analyze the implications of entrepreneurial spawning for a variety of firm characteristics such as size, focus, profitability, and innovativeness. We examine the dynamics of spawning over time. Our model accounts for much of the empirical evidence relating to the relation between spawning and firm characteristics. Firms that have higher patent quality spawn more, as do firms that have higher...

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2011
Michel A. Habib Ulrich Hege Pierre Mella-Barral

We analyze the implications of entrepreneurial spawning for a variety of firm characteristics such as size, focus, profitability, and innovativeness. We examine the dynamics of spawning over time. Our model accounts for much of the empirical evidence relating to the relation between spawning and firm characteristics. Firms that have higher patent quality spawn more, as do firms that have higher...

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