Guraya S S, Kaur R, Saxena P K
Acta Anat (Basel). 1975;91(2):222-60. doi: 10.1159/000144387.
A study has been made of the morphological and histological changes of the cat fish (Mystus tengara) ovary during its reproductive cycle in natural and confined waters. This fish is oviparous and breeds once a year during the rainy season (July throught September). Factors responsible for bringing about spawning in fishes are discussed and the onset of spawning in Mystus is attributed to monsoon rains. In the ovarian cycle 7 phases have been recognised, whic are based on the gross morphological changes in the ovary, the percentage and duration of different developmental stages of oocytes, the average diameter and the gonosmatic index. They are: 1) immature virgin (November-February); 2) preparatory virgin (March-April); 3) maturing virgin (April-May); 4) pre-spawning virgin (June); 5) spawning (July-August); 6) depletion (September), and 7) recoupment (October-November). Oocyte growth has been divided into 9 stages. The ova diameter and gonosomatic index are maximum in July and minimum in November and December.
对鲶鱼（Mystus tengara）在自然水域和受限水域繁殖周期中卵巢的形态和组织学变化进行了一项研究。这种鱼是卵生的，每年雨季（7月至9月）繁殖一次。讨论了导致鱼类产卵的因素，并将Mystus的产卵开始归因于季风雨。在卵巢周期中，已识别出7个阶段，这些阶段基于卵巢的总体形态变化、卵母细胞不同发育阶段的百分比和持续时间、平均直径和性腺指数。它们是：1）未成熟处女期（11月至2月）；2）预备处女期（3月至4月）；3）成熟处女期（4月至5月）；4）产卵前处女期（6月）；5）产卵期（7月至8月）；6）枯竭期（9月），以及7）恢复期（10月至11月）。卵母细胞生长已分为9个阶段。卵径和性腺指数在7月最大，在11月和12月最小。
