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This digital document is a journal article from Environmental Pollution, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
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This study evaluated the effect of aquatic secondary nutrient supply levels (nitrogen and phosphorus) on the subcellular response of adult male fathead minnows (Pimephales promelas) exposed to a single nominal concentration of 17@a-ethynylestradiol (EE2), a potent synthetic estrogen, under quasi-natural field conditions. Outdoor mesocosms were maintained under low, medium, and high nutrient supply conditions as categorized by total phosphorus (TP) level (nominal 0.012, 0.025, and 0.045mg TP/L, respectively), and treated with EE2 with and without a carrier solvent. Using reverse transcription-polymerase chain reaction methods, vitellogenin gene (Vg) expression was determined in the fish collected at 0h, 8h, 24h, 4d, 7d, and 14d post-exposure. Induction of Vg was detected as early as 8h post-exposure, with and without the carrier solvent, and persisted through Day 14. Results showed Vg to be significantly greater at low nutrient levels (p<0.05), suggesting that EE2 bioavailability to the fish was likely greater under less-turbid water conditions. Top to learn more
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This digital document is a journal article from Comparative Biochemistry and Physiology, Part C, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
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Fathead minnows (Pimephales promelas) are a widely-used small fish model for regulatory ecotoxicology testing and research related to endocrine disrupting chemicals (EDCs). Quantitative real-time PCR assays for measuring fathead minnow gonadotropin (GtH) @b subunit transcripts were developed and ''baseline'' transcript levels in pituitary tissue were examined over a range of age classes and spawning states. Among females, GtH@b transcripts did not vary significantly with gonadal-somatic index or gonad stage. However, in males, follicle-stimulating hormone @b subunit transcripts decreased significantly with increasing gonad stage, while mean luteinizing hormone @b subunit expression trended in the opposite direction. GtH@b transcript levels measured in pituitaries from fish that had spawned within the preceding 24 h were not significantly different from those from fish that were 2-3 days post-spawn. Exposure to the fungicide ketoconazole, a known steroidogenesis inhibitor, for 21 days significantly affected the abundance of GtH@b transcripts in pituitary tissue in males, but not females. This study provides critical data needed to design and interpret effective experiments for studying direct and indirect effects of EDCs on GtH subunit mRNA expression. Results of such experiments should facilitate a greater understanding of integrated system-wide responses of the fathead minnow brain-pituitary-gonadal axis to stressors including EDCs. Top to learn more
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This digital document is an article from The Texas Journal of Science, published by Texas Academy of Science on November 1, 2001. The length of the article is 3700 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.
Citation Details
Title: Assessment of wastewater effluent estrogenicity in North Central Texas Using the Vitellogenin biomarker in male fathead minnows. (Pimephales Promelas Rafinesque).(Statistical Data Included)
Author: Jon M. Hemming
Publication: The Texas Journal of Science (Refereed)
Date: November 1, 2001
Publisher: Texas Academy of Science
Volume: 53 Issue: 4 Page: 335(10)
Article Type: Statistical Data Included
Distributed by Thomson Gale Top to learn more
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This digital document is a journal article from Comparative Biochemistry and Physiology, Part C, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
The fathead minnow (Pimephales promelas) was employed to examine if dietary vitamin E supplementation could protect the inner ear from the deleterious effects of noise. Fish were fed one of the three experimental diets containing either: (1) low vitamin E content (14.5 mg/kg diet as @a-tocopheryl acetate), (2) an adequate amount of vitamin E (50 mg/kg), or (3) high vitamin E content (450 mg/kg). After 4 weeks on the diet, fish were exposed to either 2 or 24 h of intense white noise (142 dB re: 1 @mPa, bandwidth 0.3-4.0 kHz). Auditory thresholds were measured, using the auditory brainstem response (ABR) technique, within 0.5 days following noise exposure or within a recovery period of 1.5 days. Additionally, liver samples were analyzed for vitamin E content. Increased vitamin E supplementation was dose-dependently associated with a reduction in statistically significant threshold shifts after noise exposure and an enhancement of recovery (i.e., more complete recovery over a shorter period) for fish exposed to either 2 or 24 h of noise. The results obtained suggest that dietary vitamin E affords protection against noise exposure in a cyprinid fish. Top to learn more
You want this minnow swimming around as close to the fish as you can place it. Fish are opportunistic feeders and if you place a juicy minnow in their faces, they will eat. I would sit in shallow water and cast out to deep water with a fathead minnow and a slip bobber. 1) I would try slow trolling along the dam face with fathead minnows. Use as many rods as you are allowed to use and have your minnows at different depths. Bounce your bottom bouncer up and down on the bottom to keep it on the bottom at the depth changes. If you are not familar with area 24 on the lake map, go into Shabbona’s Lakeside Bait, Tackle and Boat Rental and buy yourself a lake map. Put your minnow under a slip bobber right into the face of the walleyes. I would use just a sinker and a minnow on a hook.
The 4 different types of fish that we were going to target, Perch, Trout, Bullhead, and Bluegill, were discussed in “Wanted Poster” fashion–the boys quickly learned their marks and were ready to fish. The simple system of employing a hook, line, sinker, and a bobber was quickly mastered by all 15 anglers as they each were responsible for setting up their combos prior to fishing.
Saprolegnia parasitica is thought to be more pathogenic than S. ferax , hence we predicted greater club cell investment and a larger turnover rate of cells by minnows exposed to S. parasitica than S. ferax. We also predicted that minnows exposed to higher numbers of cysts should invest more in club cells and have a higher turnover rate of cells. however, fish exposed to high concentrations of pathogens had smaller club cells than those exposed to low concentrations, indicating a higher rate of turnover of cells in the epidermis.
Walleyes will eat a variety of baits this time of year, but if you want to put the odds in your favor for walleye success, a jig on your line will do so. Following are some ideas for catching walleyes on jigs in the next few weeks. Fathead minnows are good, but sometimes the walleyes show a very definite preference to shiners. By hooking the minnow this way, it will stay on the hook longer and still be appealing to the walleyes. Shiners can be harder to keep alive, so an aerated container like Frabill’s 1404 is an important part of your equipment: It does an outstanding job of keeping fragile minnows lively. Put the jig hook in the minnow’s mouth and out the back of its head. If you’re going to be dragging, a stand-up jig will be more effective than a traditional round-head jig. Just as casting usually works best for early season shallow water walleyes, a slow retrieve is also usually more productive. A stand-up Fire-Ball jig in the eighth ounce size tipped with a three inch minnow is perfect much of the time. You’ll probably have to move to a different area, and another presentation might be more effective, but for now, keep in mind that jigs are great for catching walleyes.
By Gina Bittner/Gloucester County Times Freeholder Heather Simmons and Freeholder Director Robert Damminger watch the Fathead minnows and Gambusia Affinis eat the larvae of mosquitoes, in a retention Basin on Grove Road in West Deptford.
By Staff Writer CUYAHOGA FALLS — This spring, the Summit Soil and Water Conservation District (SWCD) fish sale features largemouth bass, channel catfish, bluegill, fathead minnows and white amur. The following fish will be for sale: 2-to-4-inch
By Bryan Littel Mosquitofish and fathead minnows swim out into a retention pond off Grove Road Thursday. In the war on mosquitoes, Gloucester County's soldiers are barely larger than your thumb. Thousands of Gambusia Affinis—otherwise known as the
