Ikan terbang (Excoetidae) memiliki strategi reproduksi yang diduga terkait dengan kondisi lingkungan perairan laut, seperti suhu, salinitas, angin, curah hujan, dan radiasi matahari. Penelitian dilakukan untuk 3 jenis ikan terbang (Hirundichthys oxycephalus, Cheilopogon cyanopterus, dan C. Spilopterus) selama tahun 2004 sampai dengan 2007 di perairan Indonesia. Hasil penelitian memperlihatkan bahwa ikan terbang (Excoetidae) memiliki peluang untuk memijah sepanjang tahun, dengan puncak pemijahan agak berbeda antar jenis maupun lokasi. Ada indikasi bahwa kecenderungan strategi pencapaian puncak pemijahan ikan terbang (Excoetidae) sangat dipengaruhi kondisi oseanografi, terutama suhu dan salinitas. Peristiwa upwelling yang secara periodik berlangsung selama musim timur (bulan Juni sampai dengan Agustus) di Laut Flores dan selatan Jawa diperkirakan sebagai faktor pemicu proses pemijahan ikan terbang (Excoetidae), sedangkan pola arus north equatorial di Laut Sulawesi sebagai faktor oseanografi yang mempengaruhi siklus reproduksi ikan terbang (Excoetidae). Pembuktian yang otentik lewat penelitian yang lebih komprehensif sangat diperlukan untuk mengungkapkan hal ini. Informasi ini akan sangat berguna untuk menyusun konsep kebijakan pengelolaan perikanan ikan terbang (Excoetidae) di Indonesia.  Reproductive strategy of flyingfish (Exocoetidae) relate to like temperature, salinity, wind, rainfall, and solar radiation. Three species of flyingfish (Hirundichthys oxycephalus, Cheilopogon cyanopterus, and C. Spilopterus) had been observed from 2004 to 2007. The results show that those fishes spawn throughout a year, with the spawning peak differed slightly among species and locations. However, seemingly the spawning peaks associated to the oceanographic conditions, especially temperature and salinity. Reproductive strategic of flyingfish would be generated by decreased temperature. In Flores sea and south of Java, upwelling occurs during the southeast monsoon (June until August), and this event creates low temperature. Whereas in Sulawesi Sea, the decrease of sea surface temperature occurs due to the north equatorial current. A valid evidence from comprehensive study is required to proof the phenomena. This information is valuable to develop a management plan for flyingfish fishery in Indonesia.

Blue swimming crab (Portunuspelagicus) is aeconomical valuable fisheries importantcommodity  due to the high demand and availability jobs created for the fishermen. Due to their high demand blue swimming crab heavily exploited from Salemo Island. This study aimed at comparing the sex ratio and the size at first maturity of blue swimming crab caught in mangrove ecosystems, coral reefs, and seagrass. Sex ratio was analyzed using chi square test and the size at first maturity was analyzed using the Spearman-Karber formula. The results showed the sex ratio ofmales and femalessmall crab caught in every ecosystem is balanced. The size at first maturity of blue swimming crab caught in mangrove, seagrass and coral reefs, each to the male 81,08 mm, 102,36 mm and 102,87 mm in width and size of female 94,54 mm, 83,35 mm, 98,31 mm width. In a reference to government regulations, the blue male swimming crab caught in the coral reef and seagrass ecosystems have yet to size at first maturity is allowed to be captured. Keywords: blue swimming crab, sex ratio,size at first maturity, Salemo Island

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The rabbitfish (Siganus guttatus) is a fish which has a high economic value also became one of the most popular types of fish consumed by the Takalar people up to Makassar City. The high market demand makes the effort to catch fishermen become greater so that the pressure on this species also becomes greater. therefore this research is needed to provide information in the preparation of comprehensive and systematic management strategies by policy makers to maintain the sustainability and sustainability of Siganus guttatus resources in the waters. The scope of this research includes information on rabbitfish habitat, abundance, feeding habits, sex ratio, and gonad maturity level (GML), as well as to compare the distribution pattern, gut content and GML in seagrass and coral reef ecosystems. This research was carried out from March to June 2017 in Laikang Bay, Takalar Regency, South Sulawesi Province, Indonesia. Rabbitfish samples (N = 336) were collected, comprising 293 males and 43 females with the size ranges of 11.2 – 35.9 cm and 8.4 – 35.4 cm, respectively. GML ranged from I – V. The GML in coral reef ecosystem was generally higher than in seagrass. The GML and number of individuals from the coral reef ecosystem were: GML I (133 fish), GML II (84 fish), GML III (30 fish), GML IV (12 fish), GML V (8 fish); whereas from seagrass ecosystem, GML I (12 fish), GML II (11 fish), GML III (2 fish). Gut content analysis found 36 phytoplankton species; the taxa comprising the highest percentages were Thallassiothrix sp. (69.24%) in the coral reef ecosystem and Oscillatoria sp. (26.34 %) in seagrass.

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