On 23 July 1954, the new Canadian Icebreaking Patrol Vessel H.M.C.S. Labrador (6000 tons) left Halifax, Nova Scotia, on her maiden voyage in support of the annual ship supply mission to the Canadian Arctic bases. In addition she carried out much hydrographic surveying and other scientific work, and subsequently withdrew to the westward, arriving at Esquimalt, British Columbia, on 27 September, thus becoming the first warship to complete the North-west Passage.
Oreochromis mossambicus is currently receiving much attention as a candidater species for aquaculture programs within Southern Africa. This has stimulated interest in its breeding cycle as well as the morphological characteristics of the gonads. Limited information is available on SEM and TEM observations of the male gonads. It is known that the testis of O. mossambicus is a paired, intra-abdominal structure of the lobular type, although further details of its characteristics are not known. Current investigations have shown that spermatids reach full maturity some two months after the female becomes gravid. Throughout the year, the testes contain spermatids at various stages of development although spermiogenesis appears to be maximal during November when spawning occurs. This paper describes the morphological and ultrastructural characteristics of the testes and spermatids.Specimens of this fish were collected at Syferkuil Dam, 8 km north- west of the University of the North over a twelve month period, sacrificed and the testes excised.
The North-West passage by land. Being the narrative of an expedition from the Atlantic to the Pacific, undertaken with the view of exploring a route across the continent to British Columbia through British territory, by one of the n By Viscount Milton and W. B. Cheadle.