Open AccessSPAWNING, OOCYTE DEVELOPMENT AND LARVAE REARING OF THE FLORIDA POMPANO ( Trachinotus carolinus )
Author(s) -
Hoff F. H.,
Mountain J.,
Frakes T.,
Halcott K.
Publication year - 1978
Publication title -
proceedings of the annual meeting ‐ world mariculture society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 60
eISSN - 1749-7345
pISSN - 0164-0399
DOI - 10.1111/j.1749-7345.1978.tb00252.x
Subject(s) - biology , tetraselmis , oocyte , human fertilization , zoology , brachionus , copepod , fishery , larva , algae , botany , embryo , anatomy , crustacean
Twenty‐five spawning attempts on the most reproductively developed fish were conducted on conditioned and unconditioned Florida pompano ( Trachinotus carolinus ). Human chorionic gonadotropin (HCG) was used to stimulate ovarian development. Dosage levels of .55 IU/g and .275 IU/g were usually administered 24 to 48 hours apart. Strip spawning and semi‐natural spawning were used, Spawning occurred 7 to 208 hours after initial injection depending on initial oocyte size. Optimum oocyte size (580–718 μ) produced spawning in 30–40 hours. A close correlation exists between rate of fertilization and oocyte growth during the first 16–25 hours. Fertilized eggs may shrink as much as 16% within one hour after fertilization. Two successive batches of pompano were reared to juvenile stage in 23 days. Larvae were fed a mixed diet of natural plankton (66 μ mesh net), protozoans, rotifers ( Brachionus plicatilus ) and copepod nauplii ( Oithona sp.). Water was initially conditioned with 40 liters of dense algae ( Dunaliella sp. and Tetraselmis sp.). Water quality was controlled by partial exchanges from a 40,000‐liter biologically filtered system. Eighteen‐hour lighting was used. Larvae developed edema at 8–10 days and, combined with low aeration, reduced survival to only 300 juveniles.