Report of the Inter-American Tropical Tuna Commission for the year 1967

ENGLISH: The Inter-American Tropical Tuna Commission was created and operates under the authority of a Convention first negotiated between the governments of the Republic of Costa Rica and the United States of America. The Convention entered into force in 1950. It is open to adherence by other governments whose nationals fish for tunas in the eastern Pacific area. Under this provision, Panama adhered in 1953, Ecuador in 1961, the United Mexican States in 1964. Canada applied for membership in 1967. Her membership will become effective on April 1, 1968. On August 21, 1967 the Ecuadorian government, for financial reasons, elected to withdraw from active membership. Under Convention ruling, this means that she remains a full member until August 21, 1968. SPANISH: La Comisión Interamericana del Atún Tropical fue originada y está bajo la autoridad de una Convención que fue negociada inicialmente entre los gobiernos de la República de Costa Rica y los Estados Unidos de América. La Convención entró en vigencia en 1950. Está abierta a la afiliación de otros gobiernos cuyos ciudadanos pescan atunes en el área del Pacífico oriental. Bajo esta estipulación, Panamá se afilió en 1953, Ecuador en 1961 y los Estados Unidos Mexicanos en 1964. Canadá presentó su ap1licación en 1967. Su afiliación será efectiva el 1 de abril de 1968. El 21 de agosto de 1967, el gobierno ecuatoriano por razones financieras decidió retirar su participación activa. Bajo las reglas de la Convención el Ecuador sigue actuando como miembro hasta el 21 de agosto de 1968. (PDF contains 144 pages.)

Cartas enviadas por Modesto Bargalló a Justo Garate entre 1967 y 1969

5 cartas (mecanografiadas) ; 215x140mm

On the sensillae of the limbs of Cladocera. [Translation of: Zoologicheskie Zhurnal 46, 286-288, 1967]

Sensillae of the limbs of Cladocera are described with emphasis on Eurycercus lamellatus.

Contribution to the biology and geographical distribution of Aegagropila sauteri (Nees) Kutz. [Translation of: Gidrobiologicheskie Zhurnal, Kiev 4(3), 68-69, 1967]

Aegagropila sauteri is a peculiar green algae, the branched thalli of which, according to the amount of growth, forms velvety spheres of a diameter of 3-4, sometimes to 5-6 cm. and bigger. Investigators attribute it to a special genus of green algae. The authors examine Aegagropila sauteri in Lake Markakol (Kazakhstan).

Recent investigations on zooplankton in the Limnological Institute of the University of Freiburg, in Falkau (Germany). [Translation from: Acta cient.Venezolana 18, 94-97, 1967. ]

Histochemical experiments are conducted in order to study the interrenal cells of European brook lamprey (Lampetra planeri).

Investigations into the structure and function of the exocrine pancreas of lampreys. [Translation from: Morph.Jb. 110 245-269, 1967.]

As representatives of the most primitive of recent vertebrate groups, lampreys show fundamental differences in different features of organisation to the species of the remaining classes of vertebrates. The topical distinction between exocrine and endocrine pancreas is also considered among the morphological peculiarities of Petromyzontida. This study aims to contribute to a further explanation of this phenomenon. 50 brook lampreys were histologically examined.

Flood circulation in oligomictic lakes: an undervalued reason for restriction of zooplankton production [Translation from: Memorie dell'Istituto Italiano di Idrobiologia Dott.Marco de Marchi 22 9-52, 1967]

Dormancy has been observed in several species of Cyclops. Animals in dormancy are characterised by almost complete inactivity of the main appendages and sluggish intestinal peristalsis. In Cyclops vicinus dormancy can take place in copepod stages III (19%), IV (78%) and V (3%) but one and the same animal only in one developmental stage. The author gives his own results between frequency of dormancy and photoperiod (20 C, 1000 lux). He concludes that dormancy in C. vicinus can be influenced by day length and can be ended prematurely by short day length.

Influence of carbon tetrachloride on the liver of tadpoles of brown frog (Rana temporaria) [Translation from: Trudy leningt.sanit.-gig.med.Inst. 82, 32-36, 1967]

Comparative studies of the structure and regeneration of tissues in different vertebrates make it possible to get ideas from the evolution and regeneration potential of tissues. In this study are considered the reactive changes in the liver of larvae of the amphibian Rana temporaria to CC14 of different concentrations. Tadpoles of different sizes and different growth were placed once each day every day in a vessel with a determined solution of CC14 in water. The liver of tadpoles has a distinctive structure. It is distinguished by structure not only from the liver of higher vertebrates, but also from the liver of the adult frogs. The liver of the latter has an insignificant amount of fat and a whole series of other characters not typical of the liver of the tadpole. Placing the tadpoles in a solution of CCl4 with a concentration of 0.1% did not produce in the liver noticeable morphological changes. The author concludes that the absence of degenerative changes in the liver tadpoles, in spite of a high percentage of death of the experimental animals, tells of the well-known resistance of their liver to the influence of CC14.

Cartas enviadas por Wilhem Bierhenke a Justo Garate entre 1965 y 1967

6 cartas (mecanografiadas) ; entre 210x295mm y 185x295mm.