caa a22 4500 47711623X CHVBK 20180405111623.0 cr unu---uuuuu 170330e19960401xx s 000 0 eng 10.1007/BF00002531 doi (NATIONALLICENCE)springer-10.1007/BF00002531 Reproductive biology of Awaous guamensis , an amphidromous Hawaiian goby [Elektronische Daten] [Phyllis Ha, Robert Kinzie III] Synopsis: Spawning season, size at first reproduction, oocyte maturation, and fecundity ofAwaous guamensis, an amphidromous Hawaiian goby, were studied from June 1989 through May 1991 in the Wainiha River, Kau'ai, Hawai'i. Female fish larger than 73 mm standard length (SL) had mature gonads from August through December in 1989 and 1990. Gonadosomatic index (GSI) values for mature females ranged from 0.2 to 14.5 during the spawning season. Male fish larger than 64 mm SL had elevated GSI values from June 1989 through December 1989 and from August 1990 through December 1990. Mature sperm were found in two male fish collected in January and February. GSI values for mature males ranged from less than 0.01 to 4.0 in the spawning season. Size-frequency distributions of measurements of vitellogenic oocyte diameters and microscopic observations of oocytes indicated this species has group-synchronous oocyte development. Ovarian maturation stages examined over a 29-month period suggest that members of the stock spawned at different times within the spawning season, although mass spawning events have been documented for this species. Estimates of clutch sizes from nests measured in situ were comparable to estimates of potential fecundity from in vitro examination of ovaries, and indicated that female fish deposited an entire clutch during a spawning event. No evidence for multiple spawning by an individual fish in a single season was found. However, microscopic observations of brown bodies in some ovaries suggested that individual fish probably spawn more than once in a lifetime. Kluwer Academic Publishers, 1996 Fecundity nationallicence Fish reproduction nationallicence Gobiidae nationallicence Iteroparity nationallicence Oocyte maturation nationallicence Spawning season nationallicence Stream nationallicence Fish nationallicence Awaous stamineus nationallicence Lentipes concolor nationallicence Kuhlia sandvicensis nationallicence Sicyopteris stimpsoni nationallicence Ha Phyllis U.S. Fish and Wildlife Service, P.O. Box 50167, 96850, Honolulu, HI, U.S.A. aut Kinzie III Robert Department of Zoology, University of Hawaii at Manoa, 2538, The Mall, 96822, Honolulu, HI, U.S.A. aut Environmental Biology of Fishes Kluwer Academic Publishers 45/4(1996-04-01), 383-396 0378-1909 45:4<383 1996 45 10641 https://doi.org/10.1007/BF00002531 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00002531 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ha Phyllis U.S. Fish and Wildlife Service, P.O. Box 50167, 96850, Honolulu, HI, U.S.A aut NATIONALLICENCE 700 1- Kinzie III Robert Department of Zoology, University of Hawaii at Manoa, 2538, The Mall, 96822, Honolulu, HI, U.S.A aut NATIONALLICENCE 773 0- Environmental Biology of Fishes Kluwer Academic Publishers 45/4(1996-04-01), 383-396 0378-1909 45:4<383 1996 45 10641 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer