scholarly journals Sturgeon Aquaculture - Specialized Techniques Determining the Stage of Sexual Maturity in Female Sturgeon for Artificial Spawning The Egg Polarization Index or PI

EDIS ◽  
2008 ◽  
Vol 2008 (3) ◽  
Author(s):  
Frank A. Chapman ◽  
Joel P. Van Eenennaam
Keyword(s):  
Laboratory Test ◽  
Sexual Maturity ◽  
Egg Size ◽  
Biopsy Procedure ◽  
Fact Sheet ◽  
Polarization Index ◽  
Aquatic Sciences

FA-153, a 5-page illustrated fact sheet by Frank A. Chapman and Joel P. Van Eenennaam, describes a simple field and laboratory test used to assist in predicting ovulatory response in female sturgeon, which uses the egg size and position of the nucleus in the cytoplasm as indicators — the principle behind it, materials needed, biopsy procedure, and how to determine the egg polarization index. Published by the UF Department of Fisheries and Aquatic Sciences, December 2007. FA153/FA153: Sturgeon Aquaculture—Specialized Techniques: Determining the Stage of Sexual Maturity in Female Sturgeon for Artificial Spawning: The Egg Polarization Index or PI (ufl.edu)

scholarly journals Sturgeon Aquaculture - Specialized Techniques Determining the Stage of Sexual Maturity in Female Sturgeon for Artificial Spawning The Egg Maturation Assay

EDIS ◽  
2008 ◽  
Vol 2008 (3) ◽  
Author(s):  
Frank A. Chapman ◽  
Joel P. Van Eenennaam
Keyword(s):  
Sexual Maturity ◽  
Biological Test ◽  
Fact Sheet ◽  
Egg Maturation ◽  
Final Maturation ◽  
Test Materials ◽  
Aquatic Sciences

FA-154, a 4-page illustrated fact sheet by Frank A. Chapman and Joel P. Van Eenennaam, describes a biological test to determine if sturgeon eggs are in the stage of final maturation — the principle behind the test, materials needed, and protocol. Published by the UF Department of Fisheries and Aquatic Sciences, December 2007. FA154/FA154: Sturgeon Aquaculture—Specialized Techniques: Determining the Stage of Sexual Maturity in Female Sturgeon for Artificial Spawning: The Egg Maturation Assay (ufl.edu)

scholarly journals What Are Nutrient-Dense Fish Feeds and Their Importance in Aquaculture?

EDIS ◽  
2007 ◽  
Vol 2007 (17) ◽  
Author(s):  
Richard D. Miles ◽  
Frank A. Chapman
Keyword(s):  
Water Quality ◽  
Environmental Water ◽  
Manufacturing Technology ◽  
Animal Performance ◽  
Fact Sheet ◽  
Feed Manufacturing ◽  
Fish Feeds ◽  
Aquaculture Industry ◽  
Aquatic Sciences

FA-145, a 4-page fact sheet by Richard D. Miles and Frank A. Chapman, describes the key nutrition concepts in aquaculture, the role of nutrient-dense feed in animal performance and environmental water quality, and the potential for improved feed manufacturing technology improve the profitability and sustainability of the aquaculture industry. Published by the UF Department of Fisheries and Aquatic Sciences, March 2007. FA145/FA145: What Are Nutrient-Dense Fish Feeds and Their Importance in Aquaculture? (ufl.edu)

The Maturation of the Ovaries and the Relation between Weight and Maturity in Locusta migratoria migratorioides (R. & F.)

1950 ◽  
Vol 40 (4) ◽  
pp. 539-557 ◽  
Author(s):  
John Phipps
Keyword(s):  
Sexual Maturity ◽  
Egg Size ◽  
Fat Body ◽  
Locusta Migratoria ◽  
Adult Life ◽  
Oviposition Period ◽  
Average Weight ◽  
Locusta Migratoria Migratorioides ◽  
Rate Of Increase ◽  
Constant Percentage

The objects of the investigation were to describe the process of maturation of the ovaries, to clear up the question of the relation between copulation and sexual maturity, and to determine whether any relation exists between weight and sexual maturity.The locusts used were of the transiens phase. They were kept at temperatures between 32°C. and 37°C. and relative humidities between 50 per cent, and 70 per cent.The maturation of the ovaries was followed, and is divided into four stages distinguished chiefly by the sizes of the eggs.It is shown that the average number of ovarioles per female does not change significantly with age.The numbers of ovarioles in the two ovaries of an individual often shows asymmetry, which probably increases with age.Some of the ovarioles are small. The percentage small ovarioles increases with development of the eggs. Variation between individuals in the total number of ovarioles also increases with age.The number of egg rudiments per ovariole was calculated for different ages and stages. The differences were not significant. It is concluded that new rudiments are produced during the oviposition period.It was found that when the food supply was relatively short, female locusts became mature and oviposited if allowed to pair, but did not mature if males were not present. With abundant food, unmated females matured, but more slowly than mated ones and fecundity was reduced. It is concluded that under unfavourable conditions pairing may be necessary for maturation of the ovaries.Average weights of female locusts in each of the four stages were compared. Locusts in stages III and IV, i.e., those which are mature, were found to be significantly heavier than those in stages I and II. The average weight of a number of stage I locusts 13–18 days old (whose development had been retarded by unsuitable conditions) was also found to be significantly less than that of a number of stage III locusts of the same age. It is concluded that weight depends primarily on the development of the ovaries.The relation between weight and age was investigated. Rate of increase of weight is rapid at first, is reduced for about two days, then increases again and maintains its value until the weight is about 2 gms. During the oviposition period it fluctuates irregularly.It is shown that if conditions are unfavourable to maturation the weight rises to a certain value, after which it remains constant, or falls. The fall was best seen in stage II locusts over 14 days old.There is little relation between weight and egg-size in stages I and II, but in stages III and IV the relation is closer. Rate of increase of weight with egg-size is at first low, but above an egg-length of about 4·5 mm. the rate of increase of weight becomes greater. It is suggested that this is because early growth of the eggs is due to transference of fat from the fat body and later stages to the laying down in the eggs of substances derived directly from the food.Estimates were made of water and fat content of locusts of various ages. Percentage water falls rather rapidly in the first few days of adult life after which it remains approximately constant. Percentage fat rises to a maximum at about 14 days, then falls slowly. Most of the increase in weight during maturation is due to water intake.

scholarly journals Argulus (Fish Louse) Infections in Fish

EDIS ◽  
2013 ◽  
Vol 2013 (2) ◽  
Author(s):  
Natalie Steckler ◽  
Roy P. Yanong
Keyword(s):  
Fact Sheet ◽  
Large Group ◽  
Aquatic Sciences ◽  
Fish Louse

Argulus species (Family: Argulidae), more commonly known as fish lice, are members of a large group of branchiuran parasites that infest and cause disease in fish. The argulids are crustaceans and are related to crabs, lobsters, and shrimp. This 5-page fact sheet was written by Natalie Steckler and Roy P. E. Yanong and published by the UF Department of Fisheries and Aquatic Sciences, November 2012.  http://edis.ifas.ufl.edu/fa184 

scholarly journals How Ornamental Fish Get Their Color

EDIS ◽  
2018 ◽  
Vol 2018 (3) ◽  
Author(s):  
Frank A. Chapman ◽  
Richard D. Miles
Keyword(s):  
Water Systems ◽  
Forest Resources ◽  
Ornamental Fish ◽  
Conservation Program ◽  
Fact Sheet ◽  
Orange Yellow ◽  
Food Fish ◽  
Aquatic Sciences ◽  
Genetically Determined

Color in fish is mostly genetically determined, but they are unable to produce red, orange, yellow, green, and some blue colors themselves. They get these colors from their food. Fish raised in aquariums or recirculating water systems without pigment supplementation in their diet will fade and lose their vibrant hues. Even in ponds, dietary pigment supplementation can make fishes brighter and more variably colored, just like their wild counterparts. This 6-page fact sheet written by F. A. Chapman and R. D. Miles and published by the UF/IFAS School of Forest Resources and Conservation, Program in Fisheries and Aquatic Sciences, addresses how ornamental fish get their colors and provides a list of ingredient sources for diets that can be used to enhance and intensify fish colors.http://edis.ifas.ufl.edu/fa192

scholarly journals Use of Vaccines in Finfish Aquaculture

EDIS ◽  
2009 ◽  
Vol 2009 (1) ◽  
Author(s):  
Roy P. Yanong
Keyword(s):  
Forest Resources ◽  
Warm Water ◽  
Fact Sheet ◽  
Question And Answer ◽  
Aquatic Sciences ◽  
Aquaculture Facilities ◽  
Answer Format ◽  
Finfish Aquaculture

FA156, an 8-page fact sheet by Roy P. E. Yanong, uses a question-and-answer format to address the topic of vaccine use in warm water aquaculture facilities. Includes references. Published by the UF Program in Fisheries and Aquatic Sciences, School of Forest Resources and Conservation, December 2008. FA156/FA156: Use of Vaccines in Finfish Aquaculture (ufl.edu)

scholarly journals Role of Water Temperature in Hard Clam Aquaculture

EDIS ◽  
2008 ◽  
Vol 2008 (1) ◽  
Author(s):  
Kerry Weber ◽  
Leslie Sturmer ◽  
Elise Hoover ◽  
Shirley Baker
Keyword(s):  
Water Temperature ◽  
Temperature Stress ◽  
Hard Clam ◽  
Fact Sheet ◽  
Aquatic Sciences

FA-151, a 9-page illustrated fact sheet by Kerry Weber, Leslie Sturmer, Elise Hoover, and Shirley Baker, describes the effects of water temperature in hard clam production in Florida — how it is measured, how it affects their physiology, signs of temperature stress, and how to manage for water temperature. Includes a glossary and references. Published by the UF Department of Fisheries and Aquatic Sciences, October 2007. FA151/FA151: The Role of Water Temperature in Hard Clam Aquaculture (ufl.edu)

scholarly journals Boaters Alert!

EDIS ◽  
2006 ◽  
Vol 2006 (32) ◽  
Author(s):  
Charles Jacoby ◽  
Nanette Holland ◽  
Gail Stout
Keyword(s):  
Introduced Species ◽  
Fact Sheet ◽  
Full Color ◽  
Aquatic Sciences

FA130, a 2-page full-color fact sheet by Charles Jacoby, Nanette Holland and Gail Stout, helps boaters identify some known and potential introduced species in Florida, provides a contact for reporting sightings of these species, and suggests steps that boaters can take to reduce the spread of introduced species. Published by the UF Department of Fisheries and Aquatic Sciences, December 2006.

Syntaxin 1A modulates the sexual maturity rate and progeny egg size related to phase changes in locusts

2015 ◽  
Vol 56 ◽  
pp. 1-8 ◽  
Author(s):  
Qianquan Chen ◽  
Jing He ◽  
Chuan Ma ◽  
Dan Yu ◽  
Le Kang
Keyword(s):  
Sexual Maturity ◽  
Egg Size ◽  
Phase Changes ◽  
Syntaxin 1A
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