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Incidence of conjoined twins in tilapia after thermal shock induction of polyploidy
Author(s) -
OwusuFrimpong M,
Hargreaves J A
Publication year - 2000
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1046/j.1365-2109.2000.00440.x
Subject(s) - biology , hatching , tilapia , conjoined twins , human fertilization , nile tilapia , oreochromis , zoology , fish <actinopterygii> , fishery , anatomy
Conjoined twins (polyembryonic fish) were observed in batches of blue tilapia Oreochromis aureus (Steindachner) and Nile tilapia O. niloticus (L.) embryos incubated at 28 °C. Heat shock (41.8 °C) treatment of fertilized eggs for 3–4 min applied between 4 min and 27 min after fertilization increased the twinning rate by three or four times over that of unshocked eggs. Two basic morphological variations – ventrally or laterally conjoined twins – were observed. Twins did not survive beyond 21 days after hatching. The proportion of twins in heat‐shocked egg batches of both species combined ranged from 0.32% to 0.40%.