Zeutzius I, Probst W, Rahmann H
Exp Biol. 1984;43(2):87-96.
The effect of dark-rearing (DR) on the allometrical growth relations of defined brain structures, on the lamination and the synaptogenesis of the optic tectum of the cichlid teleost Sarotherodon mossambicus was studied. Dark-rearing did not alter allometric growth relations of the optic tectum. Both in dark-reared (DR) and in normal-reared animals (NR) the predominant outgrowth of the nerve fibers in the optic tectum took place within the first 20 days after hatching. Dark-rearing changed the laminar structure of the optic tectum. In 100-day-old DR the optic layer was significantly reduced as compared to NR. The morphometric differentiation of synapses was affected by dark-rearing. In DR no significant reduction in the length of synaptic contact zones occurred between 30 and 100 after hatching, as it did in NR. Moreover, specific layers (stratum marginale, stratum griseum centrale) in 100-day-old DR showed significant increase in the number of synaptic vesicles per nerve terminal.
研究了暗饲养（DR）对丽鱼科硬骨鱼莫桑比克罗非鱼特定脑结构的异速生长关系、视顶盖的分层及突触形成的影响。暗饲养并未改变视顶盖的异速生长关系。在暗饲养（DR）和正常饲养（NR）的动物中，视顶盖神经纤维的主要生长均发生在孵化后的前20天内。暗饲养改变了视顶盖的分层结构。在100日龄的DR中，与NR相比，视层显著减少。突触的形态计量学分化受暗饲养影响。在DR中，孵化后30至100天之间突触接触区的长度没有像NR那样显著减少。此外，100日龄DR的特定层（边缘层、中央灰质层）显示每个神经末梢的突触小泡数量显著增加。
