Perilaku, kewilayahan dan kitar pembiakan ikan belacak periophthalmus chrysospilos bleeker di Teluk Tempoyak, Pulau Pinang.
| dc.contributor.author | Vijayan, Sugania | |
| dc.date.accessioned | 2015-10-09T07:19:53Z | |
| dc.date.available | 2015-10-09T07:19:53Z | |
| dc.date.issued | 2001-05 | |
| dc.description.abstract | This study is focused on 3 aspects of reproductive biology during mating periods of Periophthalmus chrysospilos; behavior, territoriality and maturation cycle. The terrestrial mudskipper P. chrysospi/os is found mostly in tropical countries and is not known to have a specific breeding season. A comparison on the reproductive behavior and territoriality during breeding was done between P. chrysospilos and the Japanese temperate mudskipper, Periophthalmus modestus, which has a definate breeding season. The sttidy identifies 3 different behavioral actions that make up their mating rituals begining with bmTow digging to build it's burrow in which it will nest, courtship displays to attract mature females to mate with and air transfer which involves supplying oxygen to its egg chamber. Only the males are found to keep nest and build territories which are evident only during mating periods. Mature females are errant, laying their eggs in the males nest and assist in transfering air only for a short period of time. Territorial size was estimated by tracking the fishes movement armmd its territory during the three afore mentioned reproductive behavior. This technique enabled us to discover that territorry size varied between each behaviors. P. modestus has a significant difference (H=7.921, p<0.05, df=2) in territorial size in relation to these behaviors due to intense competition and limited time to breed. It is probable in both these species that the female choses the males according to the quality of ii it's nest rather than the quality of the male. ~ II ~: ' ยท- fo Male and female from both spesies are found to begin courtship displays only when they enter maturity. Oogenesis is divided into 7 phases according to oocyte frequency distribution whereas the testis consists of six maturity stages for P. chrysospilos. The continuous recruitment of yolked oocytes and spematocytes indicates there is a possibility of spawning activity at all times given suitable environmental conditions.. The mature phase begins with the tertiary oocyte (phase iv) in females and secondary spermatocyte in males and is found to be present all year rmmd. Histological analysis and GSI do not show a distinct occurrence of breeding season in both male and female P. chrysospilos but do show a lengthened spawning period. However the mean GSI had varied values indicating a possibility that the populations spawning period is not synchronized. Histological observations show that the female mudskipper is an asynchronous and multiple spawner. The . ability for males ~o continue storing nutrients il} the liver and. muscle .even when. building territories and the opportunity for a female to find much food as it travels in search of a mate explains the relatively stable HSI and K values for most of the year. Low HSI and K values for the male during peak gonadal development is probably due to concentration on territorial activity. The fecundity of P. chrysospilos range from 3856- 12242 oocyte per female whereas the relative fecundity ranges from 601.625-1309.458 oocyte per gram. The fecundity is affected by to~ length (r = 0.869, P< 0.01) but not by body weight (r = 0.591, P< 0.01). P. chrysospilos, shown here to be a fecund fish, also displays parental care and this combination proves it to be an efficient spawner. | en_US |
| dc.identifier.uri | http://hdl.handle.net/123456789/1283 | |
| dc.language.iso | other | en_US |
| dc.subject | Kitar pembiakan ikan belacak | en_US |
| dc.subject | Periophthalmus chrysospilos bleeker | en_US |
| dc.subject | Teluk Tempoyak, Pulau Pinang. | en_US |
| dc.title | Perilaku, kewilayahan dan kitar pembiakan ikan belacak periophthalmus chrysospilos bleeker di Teluk Tempoyak, Pulau Pinang. | en_US |
| dc.type | Thesis | en_US |
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