Redescription of Hypoptopoma inexspectata (Holmberg, 1883), with notes on its anatomy (Siluriformes: Loricariidae).

Hypoptopoma inexspectata is diagnosed and redescribed based on the examination of additional material and comparison with its congeners. This poorly known hypoptopomine species is distributed in the Paraguay and Paraná river draínages. Hypoptopoma inexspectata is diagnosable based on the autapomorphy biserial arrangement of anterior snout rostral margin odontodes, laterally extended to limit between second and third infraorbital plates, with dorsally directed dorsad series separated from ventrally directed ventrad series by a narrow odontode-free area, which at the level of first and second infraorbital plates is reduced to a dividing line of the series. The species can be further distinguished by the combination (1) low number of canal-bearing lateral plates (20-22, typically 21), (2) presence of a shield of prepectoral dermal plates, (3) arrangement of abdominal plates in one paired series of 3-5 plates, (4) shorter least interorbital distance 4856% head lengh, (5) larger horizontal eye diameter 17-20% head lengh, and (6) least orbit-nare distance 812% head lengh. Intraspecific variation skull dermal bones, neuracranium and suspensorium bones, dermal plates, adipose fin is reported. (PDF has 20 pages.)

Monitoring hydrilla using two RAPD procedures and the Nonindigenous Aquatic Species database

Hydrilla ( Hydrilla verticillata (L.f.) Royle), an invasive aquatic weed, continues to spread to new regions in the United States. Two biotypes, one a female dioecious and the other monoecious have been identified. Management of the spread of hydrilla requires understanding the mechanisms of introduction and transport, an ability to map and make available information on distribution, and tools to distinguish the known U.S. biotypes as well as potential new introductions. Review of the literature and discussions with aquatic scientists and resource managers point to the aquarium and water garden plant trades as the primary past mechanism for the regional dispersal of hydrilla while local dispersal is primarily carried out by other mechanisms such as boat traffic, intentional introductions, and waterfowl. The Nonindigenous Aquatic Species (NAS) database is presented as a tool for assembling, geo-referencing, and making available information on the distribution of hydrilla. A map of the current range of dioecious and monoecious hydrilla by drainage is presented. Four hydrilla samples, taken from three discrete, non-contiguous regions (Pennsylvania, Connecticut, and Washington State) were examined using two RAPD assays. The first, generated using primer Operon G17, and capable of distinguishing the dioecious and monoecious U.S. biotypes, indicated all four samples were of the monoecious biotype. Results of the second assay using the Stoffel fragment and 5 primers, produced 111 markers, indicated that these samples do not represent new foreign introductions. The differences in the monoecious and dioecious growth habits and management are discussed.

Notas sobre la industria de la pesca en la provincia de Buenos Aires (Excursión de setiembre a octubre de 1895).

Notas sobre las condiciones de la pesca, economía pesquera y comentarios adiciones durante la excursión realizada por Lahille durante setiembre a octubre de 1895, a localidades marítimas y cuerpos de agua dulce de la provincia de Buenos Aires.

The reproduction of Oreochromis niloticus (Linnaeus) in Opa reservoir, Ile-Ife, Nigeria

Oreochromis niloticus is one of the commercial fish species in Opa reservoir. It bred throughout the period of study in the reservoir. The fish species is a maternal mouth brooder with the female specimens carrying eggs and alevins in their mouths. The sex ratio of O. niloticus was 1:1 and the maximum fecundity recorded was 1810 eggs. The fecundity increased as the fish length increased. The relatively high fecundity of the fish species in the reservoir is an indication of the suitability of the small reservoir in contributing to fish production

A Century of Copepods: The U.S. Fisheries Steamer Albatross

The marine invertebrates of North America received little attention before the arrival of Louis Agassiz in 1846. Agassiz and his students, particularly Addison E. Verrill and Richard Rathbun, and Agassiz's colleague Spencer F. Baird, provided the concept and stimulus for expanded investigations. Baird's U.S. Commission of Fish and Fisheries (1871) provided a principal means, especially through the U.S. Fisheries Steamer Albatross (1882). Rathbun participated in the first and third Albatrossscientific cruises in 1883-84 and published the fist accounts of Albatross parasitic copepods. The first report of Albatross planktonic copepods was published in 1895 by Wilhelm Giesbrecht of the Naples Zoological Station. Other collections were sent to the Norwegian Georg Ossian Sars. The American Charles Branch Wilson eventually added planktonic copepods to his extensive published works on the parasitic copepods from the Albatross. The Albatross copepods from San Francisco Bay were reported upon by Calvin Olin Esterly in 1924. Henry Bryant Bigelow accompanied the last scientific cruise of the Albatross in 1920. Bigelow incorporated the 1920 copepods into his definitive study of the plankton of the Gulf of Maine. The late Otohiko Tanaka, in 1969, published two reviews of Albatross copepods. Albatross copepods will long be worked and reworked. This great ship and her shipmates were mutually inspiring, and they inspire us still.

Charles H. Gilbert, Pioneer Ichthyologist and Fishery Biologist

Charles Henry Gilbert (Fig. 1) was a pioneer ichthyologist and, later, fishery biologist of particular significance to natural history of the western United States. Born in Rockford, Illinois on 5 December 1859, he spent his early years in Indianapolis, Indiana, where, in 1874, he came under the influence of his high school teacher, David Starr Jordan (1851-1931). Gilbert graduated from high school in 1875, and when Jordan became a professor of natural history at Butler University in Irvington, Indiana, Gilbert followed, and received his B.A. degree in 1879. Jordan moved to Indiana University, in Bloomington, in the fall of 1879, and Gilbert again followed, earning his M.S. degree in 1882 and his Ph.D. in 1883 in zoology. His doctorate was the first ever awarded by Indiana University.

Seminario sobre ciencias básicas como prerequisito para la enseñanza de la oceanografía (1-2 octubre de 1962)- Seminario sobre biogeografía de los organismos marinos (3-6 octubre de 1962)

Por acuerdo del Seminario Latinoamericano sobre Estudios Oceanográficos realizado en la Universidad de Concepción, Chile, 20-25 noviembre de 1961, se recomendó la realización en Argentina de un Seminario sobre Biogeografía de Organismos Marinos, indicándose al Museo Argentino de Ciencias Naturales Bernardino Rivadavia como sede del mismo. Luego de varias conversaciones en Buenos Aires (Argentina), entre autoridades del Centro de Cooperación Científica para América Latina, del CONICET (Consejo Nacional de Investigaciones Científicas y Técnicas), del Servicio de Hidrografía Naval, del mencionado Museo y del Instituto de Biología Marina de Mar del Plata, se acordó realizar los seminarios en éste último instituto del 1 al 6 octubre de 1962. Del 1 al 2 de octubre, se realizó el Seminario sobre Ciencias Básicas como prerrequisito para la Enseñanza de la Oceanografía, pero los documentos no fueron incluídos en este Boletín. Del 3 al 6 de octubre, tuvo lugar el Seminario sobre Biogeografía de Organismos Marinos, con la participación de investigadores de: Brasil, Colombia, Costa Rica, Chile, Mexico, Perú, Uruguay, Venezuela y de Argentina, y se incluyeron los siguientes trabajos publicados: Joly, A. - Extensao da flora marinha no sul do Brasil- nota preliminar; Etcheverry Daza, H. - Distribución geográfica de las algas del Pacífico; Diaz-Piferrer, M. - Biogeografía de las algas marinas tropicales de la costa Atlántica de America, Resumen,; Kuhneman, O. - Importancia de la vegetación en biogeografía marina; Boschi, E.E. - Los peneidos de Brasil, Uruguay y Argentina; Bernasconi, I. - Distribución geográfica de los equinoideos y asteroideos de la extremidad austral de Sudamérica; Szidat, L. - La parasitología como ciencia auxiliar para la biogeografía de organismos marinos; López, R.B. - Problemas de la distribución geográfica de los peces marinos sudamericanos; Ximénez, I. - Estudio preliminar de la distribución geográfica actual de los pinípedos en América Latina; Balech, E. - La división zonal en biología marina y su nomenclatura; Stuardo, J. - Distribución de los moluscos marinos litorales en Latinoamérica; Boltovskoy, E. - Provincias zoogeográficas de América del Sur y su sector Antártico según los foraminíferos bentónicos; Rioja, E. - Caracteres de la biogeografía marina de México y de Centro América; Balech, E. - Caracteres biogeográficos de la región de Argentina y Uruguay; Vannucci, M. - Zoogeografía marinha do Brasil.