Hybridization Experiments in Cyprinid Fishes II. Reciprocal Crosses between <i>Pseudogobio esocinus</i> and <i>Gnathopogon</i> <i>elongatus elongatus</i>

Reciprocal Crosses in Streptomyces Coelicolor.

interaction of two complementary growth-factor dependent mutants, i.e., Tzp lemen ta ry auxotrophs, of Streptomyces coeticolor to form grovvth-factor independent progeny, i.e., prototrophs, was interpreted as gene recombination by SERMO~TI and SPADA-SERMONTI (1955) and by BRAENDLE and SZ+BALSKI (1959yi but as heterokaryosis by BRADLEY (1957). The former workers concluded that gene recombination...

Crossbreeding of iranian fat-tailed sheep II. feedlot performance of karakul,mehraban,naeini and their reciprocal crosses

Nodular and epicellular coccidiosis in the intestine of cyprinid fishes

In the intestine of 10 (n = 18) cyprinid fish species collected from natural waters of Hungary, the author demonstrated oocysts which were shed unsporulated In tapwater, oocysts sporulated within 24 to 48 h In 6 of the fish species, oocysts of 2 sizes were observed Histological examnations proved that, of the morphologically similar oocysts larger ones developed in nodules in size of a pinhead ...

Thermal acclimation effects differ between voluntary, maximum, and critical swimming velocities in two cyprinid fishes.

Temperature acclimation may be a critical component of the locomotor physiology and ecology of ectothermic animals, particularly those living in eurythermal environments. Several studies of fish report striking acclimation of biochemical and kinetic properties in isolated muscle. However, the relatively few studies of whole-animal performance report variable acclimation responses. We test the h...

Cyprinid fishes of the genus Neolissochilus in Peninsular Malaysia.

Meristic, morphometric and distributional patterns of cyprinid fishes of the genus Neolissochilus found in Peninsular Malaysia are presented. Based on the current concept of Neolissochilus, only two species are present: N. soroides and N. hendersoni. Neolissochilus hendersoni differs from N. soroides by having lower scale and gill raker counts. Neolissochilus soroides has three mouth types (nor...