F. W. Chesson						    HP/BULLFROG.HTM
							    Rev: 11 July, 2008


               SALUTING THE AMERICAN BULLFROG  
	
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An Item From: The Wildlife Garden Forum North American Bullfrogs Posted by Edd Harris eddmg@prodigy.net The American Bullfrog, Rana catesbeiana (Shaw), our largest native frog, is nomally found from New England south and west to the Rockies, but has been introduced to many other areas. This was done officially, by state fish and game departments, and also through individual efforts. Ever since, Big Bull has been increasingly blamed for a host of ecological problems, ranging from eating fish and ducklings, wiping out other native frogs to just disrupting nature in general. In California, imported bullfrogs (and their voracious tadpoles) have been cited for the near extinction of the native red-legged frog, Rana aurora, and its several cousins. There seems to be no middle ground, when it comes to bullfrogs.... "Some people hate them with a passion and think they should be wiped out, while others love them and raise them in ponds and fish pools. What do you think of bullfrogs? Should we raise them in our ponds, or discourage them in any way possible? Below is a good site to learn about our native bullfrogs...." A Follow-Up Posting: RE: North American Bullfrogs, Posted by: Bill Bevil (bbevil3@juno.com) As you know from my postings on the Frog Forum, I am still on the fence regarding Bullfrogs. I really don't think there's any harm in introducing them to an urban wildlife garden, especially since these locales are often devoid of any amphibians at all. I will probably break down and buy some bullfrog tadpoles...having them is better than having nothing at all! Speaking of BUYING, though, wouldn't it be great if there were vendors out there who sold tadpoles for species other than Bullfrogs? I personally would rather use another species if I had a choice, just because there is so much controversy, but the only way I'm gonna get them is by collecting them from the wild. Bill (Comment: See Frog Kit, above!) Bullfrog At Home: The following is taken from an Ohio source, but is applicable to much of New England and Middle America: "An Introduction to the Natural History of the Frogs and Toads of Ohio."
"A Big Hanfulla Boo-Frawg...!" The bullfrog is Ohio's largest frog, reaching a body length of from four to seven inches (100-175 mm). Very aquatic, it seldom ventures far from permanent ponds, lakes or large streams and rivers. It emerges from hibernation and becomes active in early April but really prefers warmer weather and does not really begin calling at breeding sites until mid to late May. (In Connecticut mid-May is more typical of bullfrog emergance) Their sonorous calls can be heard into late-July, or even August, but some individuals may remain active until early October. Farther south, in the latitude of Philadelphia, solitary individuals are reported to remain active in spring-houses the year-around. The skin typically varies from olive brown through shades of green, with spots or blotches scattered about the back. Age, light and temperature are also influencing factors. Bullfrogs lack the dorso-lateral folds characteristic of other frogs, like their smaller cousins the Green Frog, Rana Clamitans (LeConte). Adult sex can be determined by comparing diameter of the tympanic membrane or "ear disk" relative to that of the eye; in males, it is much larger than the eye, while in females it is equal to or smaller. The male's throat is often bright yellow, whereas females have an off-white pale yellow mottled throat. Male frogs call to both attract potential mates and to proclaim their territory. They have paired vocal sacs, sometimes likened to built-in Helmholtz Resonators. Their low-frequency bass-fiddle calls can be heard booming over a distance of a kilometer from breeding sites. The sound is reminiscent of a bull bellowing in the distance, hence their common name. Spectrograms of typical calls show a 300 Hz scan with 0.6 second duration. After uttering challenges to encroaching males, real combat can develop, the two contestants trying to clasp each other in seeming death- like grips. (Biting does not appear a typical combat option, but an only- slightly smaller rival male may very well end up by going head-first... "down the hatch!") Mating occurrs in shallow water, or even under water. Fertilized eggs, averaging 1.3 mm diameter, are laid in a jelly-like surface mass. Up to 20,000 eggs may be produced by a single large female. These hatch in four or five days, depending on water temperature. Bullfrog tadpoles are olive-brown on back and sides. Body, tail, and crests are dotted with small dark spots having distinct, sharply defined margins. Tadpole development is comparatively slow, with up to three years required to achieve a 70-140 mm length usually attained before metamorphisis. Rear legs appear first, and may be present for a full year. The front legs appear only at the very end of transition, erupting from now-useless gill openings, as lungs evolve. The head shape changes radically, with elevated eye-sockets and a wide mouth. Though now a full-fledged air-breather, the froglet keeps his tadpole tail for some time, drawing upon its food reserves while learning to hunt moving prey, and to avoid being eaten by almost every other creature in the pond...including his own canibalistic parents....
"Great set of legs on you, kid! What say we do lunch together...?" Two to four years are necessary for a bullfrog to reach sexual maturity. In the wild a frog may live from seven to nine years, (with a good measure of luck!) while the record for captive specimens has reached 16 years.
American Bullfrog Range As noted by frog calls in several Connecticut ponds, bullfrogs tend to take over smaller bodies of water, and may well eat their green frog cousins out of house and home. After consuming every moving thing in sight, including their own smaller offspring, the big guys then become the prey of such predators as herons, raccoons, snakes and various members of the Mink Family. Then, smaller frogs slowly replentish the local amphibian scene...until the return of R. C. Shaw...! Bullfrog Abroad: In Japan, where he was introduced to rice-paddy culture ca 1920, the bullfrog is known as both Tonosama-Gaeru and Ushi-Gaeru. RANA-NON-GRATA...? According to this file, Rana Catesbiana may have been TOO successful in adapting to foreign waters. One report has it that by Royale Decree, or perhaps by Act of Parliament, bullfrogs and even their tadpoles are now contraband throught the United Kingdom, with appropiate penalties for their mere possession. Europeann complaints have also arisen of late. Can an Emergancy Action by NATO Forces be far behind...? http://www.zavod-symbiosis.si/pdf_files/literature_list_Europe.pdf. ------------------------------------------------------------------------ Institute Symbiosis Institute for nature conservation research and education, www.zavod-symbiosis.si LIST OF EUROPEAN LITERATURE ON THE AMERICAN BULLFROG (Rana catesbeiana) Albertini, G. (1970). Sulla diffusione della rana toro (Rana catesbeiana/Shaw) importata nel Mantovano. Atti. Mem Accad. Agric. Sci. Lett. Verona, 145:67-106. Albertini, G. & B. Lanza (1987). Rana catesbeiana Shaw, 1802 in Italy. Alytes. 6 (3-4): 117-129. Andreone, F. & R. Marocco (1998). Rana catesbeiana Shaw, 1802. p. 192-193 In: Andreone, F. & Sindaco R. (eds.). Erpetologia del Piemonte e della Valle d'Aosta. Atlante degli Anfibi e dei Rettili. Monografie XXVI. Museo Regionale di Scienze Naturali, Torino. Anonymus [no year]. Nota de prensa: Granajas de rana toro Americana (Spain) Anonymous (1992). Leerdam in ban superbrulkikker.de Telegraaf.17/06/1992 Anonymus (2000). Press Releases: Look out bullfrogs about. 06/09/2000. English nature, United Kingdom: www-english-nature.org.uk/news/story.asp ID=12 Anonymous (2001a). Lov na abe. Delo. 22/10/2001 [a newspaper article] Anonymous (2001b). Gefahr durch gefr---Ÿige Ochsenfrosche. Die Rheinpfalz. 22/09/2001 [newspaper article] Anonymus (2001c). Gef--hrden Ochsenfrosche jetzt auch die Fauna Deutschlands? DGHT Newsticker 24/08/2001. Arano, B., G. Llorente, M. Garc--a-Paris & P. Herrero (1995). Species Translocation Menaces Iberian Waterfrogs. Conservation Biology. 9(1): 196-198. Ayll-n, E. (1999). Posici--n de la AHE sobre las granjas de rana toro americana en el estado Espanol. Bol. Asoc. Herpetol. Esp. 10: 58-59. Bagnoli, C. & G. Albertini (1984). Sulla durata della vita larvale nelle popolazioni di Rana catesbeiana Shaw acclimatate in Italia. Studi Trentini di Scienze Naturali. 61: 283-300. Banks, B., J. Foster, T. Langton & K. Morgan (2000). British Bullfrogs? British Wildlife, June 2000: 327-330. Banks, B., C. Beckett, J. Foster, T. Langton & K. Morgan (2001). Control of North American Bullfrogs in England. Information note provided to complement poster presentation at 4th World Congress of Herpetology, Bentota, Sri Lanka, 2-9 December 2001. B-hme, W. (2000). When does a foreign species deserve a "premit of residence"? Non-indigenous species (NIS): Examples of varying exoticness and varying immigration age, taken from herpetology. Ethology Ecology and Evolution. 12(3): 326-328. This list compiled by P. Veenvliet and J. Kus Veenvliet, under the scope of the project Study of application of EU wildlife trade regulations in relation to species which form an ecological threat to EU fauna and flora which was carried out by Amphi Consult, Denmark for the European Commission, DG Environment. Boettger, C. R. (1941). Der Versuch einer Ochsenfroschzucht in der L-neburger Heide. Sitzungsberichte der Gesellschaft Naturforschender Freunde zu Berlin. p. 216-221. Brabadillo, L.J., J.I. Lacomba, V. P-rez-Mellado, V. Sancho, L.F.L--pez-Jurado (1999). Anfibios y Reptiles de la Peninsula Iberica, Baleares y Canarias. Guida ilustrada para identificar y conocer todas las especias. p. 360. Breuls, W. (1993). Brulkikker eet huismus. Natuurhistorisch Maandblad. 82(3): 68 Capocaccia, L. (1957). Gli Anfibi come animali da acquario-terrario. Zoo. (Boll. Giard. zool. Milano, Torino, Varallo). 3(3-4): 126-138. Co-c, C. & M. D=aint (2001). Invasion de la grenouille taureau (Rana catesbeiana Shaw) en France: Synth=se bibliographique --- suivi 2000-2001 == perspectives. Cistude nature, D=cembre 2001. Dalbeck, L., M. Hachtel, A. Heyd, K. Sch-fer, M. Sch--fer & K. Weddeling (1997) Amphibien im Rhein-Sieg-Kreis und in der Stadt Bonn: Verbreitung, Gew=sserpr =ferenzen, Vergesellschaftung und Gef=hrdung. Decheniana (Bonn). 150: 235-292. Dubois, A. (1983). A propos de cuisses de grenouilles. Protection des amphibiens, arretes ministeriels, projets d'=levage, gestion des populations naturelles, enqu=tes de repartions, production, importations et consommation; une equation difficile a resoudre. Les propositions de la societe batracho- logique de France. Alytes 2(3): 69-111. Eckstein H. P. & H. Meinig (1989). Umsiedlungen und Aussetzungen von Amphibien und Reptilien in Wuppertal. Jahrbuch fur Feldherpetologie. 3: 168-176. Espagnet, P. (1990). La grenouille-torreau arrive en Gironde. SudOuest (Chronique: Environment no du 9 novembre 1990). Fog, K., D. F. de Lasson & A. Schmedes (1997). Nordens padder og krybdyr. G.E.C. Gads Forlag. Frazer, J.F.D. (1964). Introduced species of amphibians and reptiles in main- land Britain. British Journal of Herpetology. 3(6.): 145-150. Froglife (1997). Exotic Reptiles and Amphibians in the Wild. Information and advice on the problems of non-native speices in Britain and Ireland. Froglife advice sheet 8. [a brochure] Garc=a-Par=s, M. (1991). Primeros datos sobre Rana catesbeiana/Shaw, 1802 (Anura: Ranidae) en Espana. Rev. Esp.Herp. 5: 89-92. Graaf, de Ir. E. (1990) Handel in en verspeiding van de "brulkikker." (bullfrog) Fauna Inlichtingen Bulletin Signaalver No. 1. pp.15 Gubbels R.E.M.B. (1992). Uitheemse amfibien en reptielen. p. 274-277. In: Coelen, J.E.M. van der (ed.) (1992). Verspreiding en ecologie van amfibien en reptielen in Limburg. Stichting Natuurpublicaties Limburg, Stichting RAVON. Maastricht, Nijmegen. Haffner, P. (1997). Bilan des introductions r=centes =amphibiens et de reptiles dans les milieux aquatiques continentaux de France Metropolitaine. Bulletin Francais de la P=che et de la Pisciculture. 344/345 : 155-163. Hamann O., J. Baag=e, I.R. Weidema, P. Andersen-Harlid (eds.) (2001). Invasive arter og GMO'er == nye trusler mod naturen. Temarapport nr.1. 2001. Naturr=¥det. p. 74 Jooris, R. (2000). Exoten onder de inheemse herpetofauna. De Wielewaal. 66: 42 x 47. Jooris, R. (2002). Palmt de Stierkikker uit Noord-Amerika ook Vlaanderen in? Een stand van zaken. Natuur.focus. 1(1): 13-15. Kok, Ph. J. R. (2001). Note sur (le) introduction de Rana bedriagae Camerano, 1882 (Anura, Ranidae) en Belgique et ses possibles implications sur la batrachofaune indigine. Les Naturalistes belges. 82(1): 25-30. Lapini, L., A. Dall'Asta, N. Bressi, S. Dolce & P. Pellarini (1999). Atlante corologico degli anfibi e dei rettili del friuli-Venezia Giulia. Museo Friul. St. Nat. ed., Udine. Pubblicazione n. 43. Lanza, B. (1962).On the introduction of Rana ridibunda Pallas and Rana catesbeiana Shaw in Italy. Copeia. 3: 642-643. Institute Symbiosis == Institute for nature conservation research and education, www.zavod-symbiosis.si Lanza B. & V. Ferri (1997). Rana catesbeiana p. 132-133. In: Gasc, J.-P., A. Cabela, J. Crnobrnja-Isailovic, D. Dolmen, K. Grossenbacher, P. Haffner, J. Lescure, H. Martens, J. P. Martínez Rica, H. Maurin, M.E. Oliviera, T. S. Sofianidou, M. Veith & A. Zuiderwijk (eds.). Atlas of Amphibians and Reptiles in Europe, Societas Europaea Herpetologica & Museum national d'histoire naturelle, Paris. Laufer, H.(2001). Anmerkungen zur Biologie und =–kologie des Ochsenfrosches Rana catesbeiana. [unpublished report]. Laufer, H. & M. Waitzman (2002). Der Ochsenfrosch (Rana catesbeiana) am n=rdlichen Oberrhein (Baden-Wurttemberg). Herpetofauna. 24(136), Februar 2002: 5-14. Leiter-L=rn, A. (1927). Die Zucht des Ochsenfr0sches. Fischerei-Zeitschrift 30: 499. Lever, C. (1994). Naturalized animals: The ecology of successfully introduced species. T & AD Poyser Ltd., London. Malkmus, R. (1995). Die Amphibien und Reptilien Portugals, Madieras und der Azoren. Verbreitung, =kolgie, Schutz. Die Neue Brehm-B=cherei Bd. 621. p., Westarp Wissenschaften, Magdeburg. p. 50. Manhold. J. (2002). Ochsenfrosch-Alarm in Meckenheim. General Anzeiger. 3. May 2002. p. 11. Mantziou, G., M. Dretakis & P. Lymberakis (1998). Who is next? A history of recent introductions and probable extinctions of reptile and amphibian species of Crete. Poster presented on 10th Ordinary General Meeting of Societas Europaea Herpetologica. Mazzotti S., G. Caramori & C. Barbieri (1999). Atlante degli Anfibi e dei Rettili dell'Emilia-Romagna (aggiornamento 1992/1997), Quad. Staz. Ecol. civ. Mus. St. nat. Ferrara, 12. pp. 46-47- Mazzoti, S. & Stagni, G. (1993). Rana toro. (bullfrog) p. 70-71. In: Mazzotti S. & Stagni G. (1993).Gli Anfibi e i Rettili dell'Emilia-Romagna (/Amphibia, Reptilia/). Museo Civico di Storia Naturale di Ferrara. Ministerio dell =Ambiente e della tuteladel territorio (2002). La fauna in Italia. Touring club italiano, Milano. 448 p. Mudde, P.(1992). De brulkikker (Rana catesbeiana), herkenning en gevaar voor andere soorten. Lacerta. 50(3): 121-128. Ness, N. 2002. Froschplage. Stern magazin. No. 43, p. 23. [newspaper article] Neveu, A. (1997). =introduction d=esp=ces allochtones de grenouilles vertes en France, deux problemes differents: celui de R. catesbeiana et celui des taxons non presents du complexe esculenta. Bulletin Francais de la Peche et de la Pisciculture. 344/345: 165-171. Niferik, van (1989). The American bullfrog. A case of adulteration of the local fauna or noise pollution? Amoeba. 63:6. N=llert, A. & C. N=llert (1992). Die Amphibien Europas: Bestimmung, Gef=hrdung, Schutz. Franckh-Kosmos, Stuttgart. p.363-365. Peleguezuelos, J.M. (1997). Distribuci0n y biogeografia de los anfibios y los reptiles en Espana y Portugal. Monografias de Herpetologia. Volumen 3. Universidad de Granada, Granada. Pollo, C. J. (2001). Informe sobre la existencia de una granaja de cr=a de rana toro (Rana catesbeiana) en Brugos de Fenar, provincia de Le=n. Proyecto Asociacion Herpetologica Espanola - Ministerio de medio ambiente, subproyecto especies introducidas. [an unpublished report]. Schops, I. (1999). Brulkikker. Rana Catesbeiana (Shaw, 1802). p. 128-129. In: Schops, I. (1999). Amfibienn en Reptielen in Limburg. Verspreiding, bescherming en herkenning. Likona, Genk. Scoccianti, C. (2001). Amphibia: aspetti di ecologia della conservazione. [Amphibia: Aspects of Conservation Biology]. WWF report. Societas Herpetologica Italica (1996). Atlante provvisorio degli Anfibi e dei Rettili Italiani. Estratto dagli Annali del Museo Civico di Storia Naturale "G. Doria". XCI, 12th Maggio 1996.41: 95-101, 139 (a map). Institute Symbiosis = Institute for nature conservation research and education, www.zavod- symbiosis.si Smit, G. & A. Zuiderwijk (1990). Herpetogeografische dienst 'Lacerta', Nieuwsbrief Nr. 4. Mededelingenblad Lacerta. 20(4): 9-14. Sneep, J.-W. (1999). Control and eradication of non-native terrestrial vertebrates in the Netherlands. p.51-57. In: Environmental Encounters No. 41, Workshop on control of non-native terrestrial vertebrates, Malta 3-5 June 1999. Stumpel, A. H. P. (1991). Brulkikker plant zich met succes voort in Nederland. Mededelingenblad Lacerta. 21 (8): 9. Stumpel, A. H. P. (1992). Successful reproduction of introduced bullfrogs Rana catesbeiana in northwestern Europe: a potential threat to indigenous amphibians. Biological conservation. 60: 61-62. Thiesmeier, B., O. Jäger & U. Fritz (1994). Erfolgreiche Reproduktion des Ochsenfrosches (Rana catesbeiana) im nerdlichen Landkreis B=blingen (Baden- Wurttemberg). Zeitschrift fur Feldherpetologie. 1: 169-176. Timmermans, G. (1993). Een "wilde" Brulkikker in de buurt van Amsterdam. Natura.3(4): 83-85. Touratier, L. (1992a). Premiere apparition en France (region Aquitaine) de =une grenouille giante Americaine : Rana catesbeiana en voie de Acclimatement, int==t zoologique et impact eventuel sur ==environnement. Bull Soc. V=. Prat de France. 76(4): 219-228. Touratier, L. (1992b). Similitudes et differences actuellement apparentes entre les grenouilles-taureaux (Rana catesbeiana) e voie propagation en Italie et en France. Emergence des questions de sante publique veterinaire. Bull Soc. V=t. Prat de France. 76(6-7) : 349-355. Veenvliet, P. (1996). Brulkikkers (Rana catesbeiana) in Nederland: storm in een glas slootwater? Lacerta. 54 (5): 168-172. Veith, M, J. Kosuch, R. Feldmann, H. Martens & A. Seitz (2000). A test for correct species declaration of frog legs import from Indonesia into the European Union. Biodiversity and Conservation. 9: 331-341. Walker, M. (2001). An American Bullfrog in Paris. The Globalist 26 April 2001. Wavrin de, H. (2000). Note sur la presence de la Grenouille Taureau (Rana catesbeiana) en Barbant Wallon. Les Nouvelles de l'Atlas herpetologique. Projet de nouvel atlas de Wallonie et Bruxelles, Maison Liegeoise de l'Environnement, Liege. Werner, E.E. & G.A. Wellborn, M.A. McPeek (1995). Diet composition in postmetamorphic Bullfrogs and Green frogs: Implications for interspecific predation and competition. Jornal of Herpetology. 29: 600-607. Zuiderwijk, A. (1990). Project Reptielen - Natuurbeleidsplan. Nieuwsbrief Nr. 4. Herpetogeografische Dienst 'Lacerta'. Mededelingenblad Lacerta. 20(10/11): 9-15. * * * Bullfrog On-line: http://ag.ansc.purdue.edu/aquanic/publicat/govagen/nal/frog_culture.htm FROG CULTURE Aquatopic. Robert S. Isenstein, August 1995. Aqua-Topics Aquaculture Information Center National Agricultural Library... P76 1990 1988. Lester, D. Raising bullfrogs on non-living food...? http://bullfrogs-louisiana.com/ Bullfrogs have been an interest of mine for many years. I have done extensive work on the challenges involved in feeding Bullfrogs in captivity. Is eating non-moving food possible...? http://dnr.metrokc.gov/wlr/waterres/amphibian/bullfrog.htm Bullfrog ID in King County. New ponds especially for raising bullfrogs. http://www.conservation.state.mo.us/conmag/1995/jul/jul6.html Raising Tadpoles Have you wondered what it takes to raise tadpoles into frogs...? http://www.cs.uh.edu/~clifton/helpdesk3.html The Help Desk, by Margaret and Clif "My son is interested in raising bullfrogs for commercial use...." http://www.dnr.state.wi.us/org/caer/ce/eek/teacher/frogact.htm "EEEK! Raising Frogs in the Classroom" by Dreux Watermolen, Bureau of Integrated Science Service, Wisconsin Department of Natural Resources. Hatching frog eggs and raising larval amphibians to metamorphosis can be a Big Leap.... http://www.gramps.com/text/biz2/r0163.htm RAISING AND MARKETING EXOTIC ANIMALS FOR PROFIT. The business of raising and selling rare/unusual animals, where both expenses and profits are much bigger than normal. http://www.greenspun.com/bboard/q-and-a-fetch-msg.tcl?msg_id=000ANg y2k Frog Legs? I ate wild frog legs (smoked) as a kid. Any info on raising/ growing frogs for y2k food? I remember they tasted like chicken.... http://www.mda.state.md.us/aqua/frogs. Bullfrogs. Compiled by: Ann Townsend Young, US Department of Agriculture Agricultural Research Service National Agricultural Library Alternative Farming Systems Information Center, Beltsville, Maryland..."Raising bullfrogs on non-living food." http://www.oit.itd.umich.edu/bio/doc.cgi/Chordata/Lissamphibia/Anura/Ranidae/ Ranacatesbeiana.ftl North American Bullfrogs http://www.safelink.net/bullfrog/ Rana Ranch Bullfrog Farm features captive bred, commercially raised bullfrogs. http://www.sonic.net/melissk/index.html Melissa Kaplan's Herp Information Collection "Nothing happens in contradiction to nature, only in contra- diction to what we know of it." http://www.ualberta.ca/~rswan/ERAAS/bullfrog.htm Class Amphibia includes Frogs, Toads, Salamanders, and worm-like Caecilians.... Some Closing Observations... LIFE, it has been said, could be a hell of a lot simpler... just raising Bullfrogs! Of course, there ARE problems, as you watch your little tadpoles grow up into bearers of marketable frog legs. You might go out to the pool some fine morning, and there are all your prize breeders, floating upside-down, done in overnight by the Fast-Fatal French Frog Flu! Long legs extend down into the turgid waters, distended white bellies gleam dully, and little front hands clutch out, as in futile supplication to the Indifferent Overcast Above.... So, you may as well buck up and hit that old road, with this bit of great tried-and-true advice in mind: "As you struggle through this life, Pal, Whatever be your Goal, Keep your eye upon the Doughnut, And NOT upon the Hole....!" * * *
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