@article{article_1120725, title={Microscopic Evaluation of Balloon Variety Jack Dempsey (Rocio octofasciata Regan, 1903) Larval Ontogeny}, journal={Avrupa Bilim ve Teknoloji Dergisi}, pages={398–405}, year={2022}, DOI={10.31590/ejosat.1120725}, url={https://izlik.org/JA52XZ46JJ}, author={Sepil, Ahmet and Çavuş, Asude and İlmen Çevik, Seda}, keywords={Cichlidae Ailesi, Cichlidler, Balık Larvası Ontogenisi, Rocio octofasciata, Jack Dempsey Balığı, Süs Balığı Türleri.}, abstract={In this study, it was aimed to determine the larval ontogeny of the balloon Jack Dempsey (Rocio octofasciata Regan, 1903) on the Atlantic slopes from Southern Mexico (Papaloapán River) to Honduras (Ulua River). In addition, embryonic and larval developmental stages were evaluated microscopically. Experiments were performed with 25 brood fish (20 females-5 males) and their reproduction was carried out after the appropriate adaptation period. The ellipsoidal and transparent eggs were found to be short axis with an average of 973.2±21.7 µm and long axis with an average of 2159±84.5 µm (n:60). Eggs have started to hatch at 27.30±0.41°C approximately 52 hours after spawning. It was determined that the total length of the newly hatched larvae was around 3220±20 µm (n:30), they started to feed exogenously 6 days after hatching and they started to take particulate and powder feeds at the end of 21 days after hatching. The early-stage growth formula calculated with Jack Dempsey’s exponential relationship model is y = 4.097e0.052x (R2 = 0.8669, n=30).}, number={38}