Lunar synchronization of spawning in sea bass, Lates calcarifer (Bloch): Effect of luteinizing hormone-releasing hormone analogue (LHRHa) treatment
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Based on egg collection records, spontaneous spawning activity of sea bass, Lates calcarifer (Bloch), reared in floating net cages followed a semilunar cycle. The peak of multiple spawnings coincided with declining spring tides of quarter moon periods. Maximum diameter of intra-ovarian, ripe oocytes (0.51–0.55 mm) occurred in synchrony with the quarter moon periods. Smaller oocytes (0.44–0.47 mm) were sampled during the new and full moon periods. Two structural analogues of luteinizing hormone-releasing hormone (LHRHa) (des-Gly10, D-Ala6-LHRH ethylamide and D-Ala6, Pro9-Nethylamide-LHRH), in pelleted or dissolved form, induced mature female sea bass with a mean egg diameter of at least 0.40 mm to spawn at any day during the lunar cycle. The onset of spontaneous and LHRHa-induced spawnings occurred during low tides in the evening until dawn (from 19.00 to 05.00 hours). These results demonstrate that LHRHa can effectively induce mature sea bass to spawn independent of the highly predictable semilunar spawning rhythm. In addition, the occurrence of both spontaneous and hormone-induced spawnings at a precise period of the day suggest a tidal and diurnal cue entraining spawning of mature female sea bass.
การอ้างอิงGarcia, L. (1992). Lunar synchronization of spawning in sea bass, Lates calcarifer (Bloch): Effect of luteinizing hormone-releasing hormone analogue (LHRHa) treatment.
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Milt production of sea bass Lates calcarifer Bloch administered an analogue of luteinizing hormone-releasing hormone and 17α-methyltestosterone Hilomen-Garcia, G. V.; Baldevarona, R. B.; Lacanilao, F. (Society of Israeli Aquaculture and Marine Biotechnology, 2002)The milt production responses of sexually mature sea bass Lates calcarifer to (D-Ala<sup>6</sup>, Pro<sup>9</sup>-N- ethylamide) luteinizing hormone-releasing hormone (LHRHa) and 17α-methyltestosterone injections were ...
Hilomen-Garcia, G. V.; Baldevarona, R. B.; Lacanilao, F. J. (Aquaculture Department, Southeast Asian Fisheries Development Center, 1996)Milt volume, sperm density, and number of spermatozoa were determined to quantify milt production of mature sea bass after a single injection of LHRHa [(D-Ala6,Pro9-N-ethylamiide)LHRH] in saline solution and 17α-methyltestosterone ...
Sustained hormone release. III. Use of gonadotropin releasing hormone analogues to induce multiple spawnings in sea bass, Lates calcarifer Almendras, Jesus Manolo; Duenas, Corazon; Nacario, Jonathan; Sherwood, Nancy M.; Crim, Laurence W. (Elsevier, 1988)Two gonadotropin releasing hormone analogues (GnRHa), [D-Ala<sup>6</sup>, Pro<sup>9</sup>-ethylamide] mammalian GnRH and [D-Arg<sup>6</sup>, Pro<sup>9</sup>-ethylamide] salmon GnRH, were shown to induce spawning in see ...