Seksualni razvoj i reproduktivni ciklus raže okatice Atlantoraja cyclophora (Regan, 1903), (Chondrichthyes: Rajidae: Arhynchobatinae) u južnom Brazilu

Specimens of Atlantoraja cyclophora were collected monthly from commercial fishing landings at Guarujá, São Paulo State, Brazil, from March 2005 to April 2006 at depths between 10 and 146 m. Males ranged from 13.3 to 58.5 cm TL (n = 396). Both the smallest mature male and the largest immature male were 47.0 cm long. Males’ size-at-50% maturity was calculated to be 46.3 cm. Females ranged from 11.5 to 68.0 cm (n = 401). The smallest mature and the largest immature female were 51.6 and 53.0 cm long respectively. For the females, size-at-50% maturity was calculated to be 53.2 cm. In the males the hepatosomatic and gonadosomatic indices varied between 0.48 (August) and 3.54 (November) and between 0.15 (November) and 1.45 (June) respectively, with no significant variation for the fourteen-month period. In the females the hepatosomatic and gonadosomatic indices varied from 1.55 and 6.30 3.54 (both for April 2006) and from 0.08 (December) to 4.41 (October) respectively, with no significant difference among months. Egg-bearing females were found in all months with proportions varying from 0.03 (March) to 0.67 (April). Both males and females undergo an annual cycle, with slight seasonal variations in reproductive activity and a peak in the proportion of egg bearing females between April and July.Jedinke raže okatice, Atlantoraja cyclophora prikupljene su mjesečno iz gospodarskih lovina u Guarujáu, država São Paulo, Brazil, od ožujka 2005. do travnja 2006. na dubinama od 10 do 146 metara. Duljina mužjaka kolebala je od 13.3 do 58.5 cm TL (n=396). Najmanji spolno zreli mužjak i najveća spolno nezrela ženka bili su dugi 47.0 centimetara. Izračunata dužina mužjaka pri stadiju 50% zrelosti populacije je iznosila 46.3 cm. Dužina ženki se kretala u rasponu od 11.5 do 68.0 cm (n=401). Najmanja spolno zrela i najveća nezrela ženka su bile dugačke 51.6 cm, odnosno 53.0 cm. Izračunata dužina ženki pri stadiju 50% zrelosti populacije je iznosila 53.2 cm.Kod mužjaka su hepatosomatski i gonadosomatski indeks kolebali od 0.48 (kolovoz) i 3.54 (studeni) i između 0.15 (studeni) i 1.45 (lipanj) bez značajnih kolebanja tijekom razdoblja od četrnaest mjeseci. Kod ženki su hepatosomatski i gonadosomatski indeks kolebali od 1.55 do 3.54 (oba u travnju 2006.) i između 0.08 (prosinac) i 4.41 (listopad), bez značajnijih mjesečnih kolebanja. Ženke s jajima su bile nazočne tijekom svih mjeseci u razmjerima koji su kolebali od 0.03 (ožujak) do 0.67 (travanj). I mužjaci i ženke prolaze kroz svoj godišnji ciklus, sa neznatnim sezonskim kolebanjima u reproduktivnoj aktivnosti i maksimumom u proporciji ženki s jajima između travnja i srpnja

PRIMER REGISTRO DE MANTA BIROSTRIS (DONNDORFF 1798) (BATOIDEA: MOBULIDAE) EN EL RIO DE LA PLATA, URUGUAY A NEW RECORD OF MANTA BIROSTRIS (DONNDORFF 1798) (BATOIDEA: MOBULIDAE) IN THE RIO DE LA PLATA, URUGUAY

Se registró la presencia de un macho de la mantarraya Manta birostris (Donndorff 1798) en la desembocadura del arroyo Pando (34° 48' S-55° 43' O), Río de la Plata, Uruguay. El ancho del disco fue de 4.20 m con un peso estimado de 900 kg. Este hallazgo es el primer registro de M. birostris para las costas uruguayas y representa una ampliación, hacia el sur, del área de distribución de esta especie en el Océano Atlántico sudoccidental. Se discute, además, la ocurrencia de esta especie oceánica en aguas estuarinas<br>A male specimen of the giant manta ray, Manta birostris (Donndorff 1798), was founded at the Pando stream mouth, Uruguay (34° 48' S-55° 43' W). The disk width was 4.20 m and the total body weight was estimated in 900 kg. This finding, the first ever to be register on the coastal waters of Uruguay, extends the known distribution of the manta ray into the south-western Atlantic. The presence of this oceanic specie in estuarine waters is discusse

Cápsulas ovígeras de la raya pequén, Psammobatis scobina (Philippi, 1857) Rajiformes, Rajidae)

En diciembre de 2005 se recolectaron cápsulas ovígeras de dos hembras de Psammobatis scobina, capturadas en Caleta Montemar, Chile central (32º57�S-71º33�W). La superficie de las cápsulas fue suave y finamente estriada, de color café y translúcida. Además presentaron la típica forma de barril. La longitud central fluctuó entre 35,25 mm y 38,45 mm y su ancho varió entre 25,91 mm y 27,94 mm. La cara dorsal es convexa con respecto a la ventral. Los cuernos anteriores son más cortos que los posteriores, se orientan hacia el interior y se estrechan hasta adquirir forma de zarcillos hacia las puntas. Los zarcillos laterales resultaron ser un carácter diagnóstico entre especies del mismo género en Chile. Esta es la primera descripción de las cápsulas ovígeras de P. scobina, especie endémica para las costas del sur de Sudaméric

Enhancing a Web Crawler with Arabic Search

Many advantages of the Internetâ ease of access, limited regulation, vast potential audience, and fast flow of informationâ have turned it into the most popular way to communicate and exchange ideas. Criminal and terrorist groups also use these advantages to turn the Internet into their new play/battle fields to conduct their illegal/terror activities. There are millions of Web sites in different languages on the Internet, but the lack of foreign language search engines makes it impossible to analyze foreign language Web sites efficiently. This thesis will enhance an open source Web crawler with Arabic search capability, thus improving an existing social networking tool to perform page correlation and analysis of Arabic Web sites. A social networking tool with Arabic search capabilities could become a valuable tool for the intelligence community. Its page correlation and analysis results could be used to collect open source intelligence and build a network of Web sites that are related to terrorist or criminal activities.http://archive.org/details/enhancingwebcraw109457288Lieutenant, United States Nav

Description of the egg capsule of Atlantoraja Castelnaui (Elasmobranchiii, Rajidae)

Submitted by Denielton Guimarães ([email protected]) on 2011-09-22T19:30:39Z No. of bitstreams: 1 Description of the egg capsule of Atlantoraja Castelnaui (Elasmobranchii, Rajidae).PDF: 170232 bytes, checksum: cb78e2bd9ef8ba149a3a7ff6d1ba63d8 (MD5)Approved for entry into archive by Barbara Milbrath([email protected]) on 2011-09-24T03:02:22Z (GMT) No. of bitstreams: 1 Description of the egg capsule of Atlantoraja Castelnaui (Elasmobranchii, Rajidae).PDF: 170232 bytes, checksum: cb78e2bd9ef8ba149a3a7ff6d1ba63d8 (MD5)Made available in DSpace on 2011-09-24T03:02:22Z (GMT). No. of bitstreams: 1 Description of the egg capsule of Atlantoraja Castelnaui (Elasmobranchii, Rajidae).PDF: 170232 bytes, checksum: cb78e2bd9ef8ba149a3a7ff6d1ba63d8 (MD5) Previous issue date: 200

Egg capsules of the yellownose skate Zearaja chilensis (Guichenot 1848) and the roughskin skate Dipturus trachyderma (Krefft and Stehmann 1974) (Rajiformes: Rajidae) from the south-eastern Pacific Ocean

Egg capsules of Zearaja chilensis were obtained from individuals kept in captivity and from dead specimens captured in Valparaíso Bay, central Chile. One female under laboratory conditions deposited three pairs of egg capsules in 6 days. The egg capsules of Dipturus trachyderma were obtained from a female captured in Valdivia, south Chile. Fresh egg capsules of both species were golden-brown and thick walled. Size of egg capsules of Z. chilensis ranged from 94 to 144 mm in capsule length and 64 to 76 mm in capsule width. Those of D. trachyderma ranged between 197 and 199 mm in capsule length and 110. 0 and 129. 0 mm in capsule width. Range and mean values of capsule length and width of egg capsules described in this study were smaller than those reported for the same species in the south-western Atlantic Ocean. This is the first report on egg-laying rate of Z. chilensis and the first description of egg capsules of Z. chilensis and D. trachyderma from the south-eastern Pacific Ocean