Kajian kematangan gonad pada rajungan betina mengerami telur dan fekunditas berdasarkan warna telur masih terbatas. Penelitian ini menganalisis fekunditas dan tingkat kematangan gonad rajungan betina mengerami telur di Teluk Lasongko, dilakukan dari bulan April 2013 sampai Maret 2014. Fekunditas rajungan dianalisis berdasarkan kelas ukuran tubuh danwarna rajungan betina mengerami telur. Tingkat kematangan gonad ditentukan berdasarkan perubahan warna dan morfologi gonad. Fekunditas rajungan berkisar 69.747-2.078.874 butir dengan lebar karapas 86,6-162,3mm. Fekunditas rajungan bervariasi terhadap ukuran tubuh dan warna rajungan mengerami telur, serta berkorelasi dengan ukuran tubuh dan berat telur. Rajungan betina mengerami telur ditemukan dari TKGI sampai IV. Fekunditas rajungan di perairan ini tergolong sedang sampai tinggi, rajungan betina mengerami telur berwarna kuning dan orange didominasi belum matang gonad sedangkan berwarna coklat dan abu-abu gelap didominasi matang gonad.
AbstrakEstuari Sungai Donan merupakan kawasan perairan yang banyak dimanfaatkan untuk berbagai kegiatan, antara lain industri, perikanan dan kegiatan domestik. Kegiatan yang dilakukan diperkirakan dapat menimbulkan pencemaran logam berat terhadap lingkungan perairan dan organisme di perairan tersebut. Penelitian ini bertujuan untuk menganalisis kandungan logam berat Cu dan Cd pada daging ikan belanak (Chelon subviridis) yang tertangkap di estuari Sungai Donan dan menetapkan batas aman bagi masyarakat dalam mengonsumsi ikan tersebut. Pengambilan contoh ikan dilakukan selama 6 bulan sejak Agustus 2015 sampai Januari 2016. Pengukuran kandungan logam berat dilakukan dengan menggunakan AAS (Atomic Absorption Spectrophotometer). Hasil pengukuran kandungan logam Cu dan Cd dalam daging menunjukkan nilai sebesar 0,5009-2,6021 mg/kg dan 0,0165-0,2307 mg/kg yang mengindikasikan bahwa kandungan logam berat dalam daging telah melebihi ambang batas yang telah ditetapkan. Hasil perhitungan batas maksimum konsumsi ikan belanak (Chelon subviridis) di estuari Sungai Donan adalah 151,72 g daging/minggu (untuk orang dewasa) dan 45,52 g daging/minggu (untuk anak-anak).Kata kunci: akumulasi, baku mutu, Chelon subviridis, pencemaran AbstractThe estuary of Donan River is an aquatic area that commonly utilized for some activities such as industrial, fisheries and domestic activities. The effluents of many activities may be cause heavy metal contamination for water enivornemant and organism live in the water. The aim of this research was to analyse heavy metal contain Cu and Cd on the mullet (Chelon subviridis) muscle caught at estuary of Donan River, and to determine the safety limit for community consumption. Sampling had been carried out for 6 months, from August 2015 to January 2016. Heavy metal concentration was measured by AAS (Atomic Absorption Spectrophotometer). Result of the study shows that heavy metal Cu and Cd in the fish muscle were 0.5009-2.6021 mg/kg and 0.0165-0.2307 mg/kg, respectively that were higher than safety limit. Based on the study, the safety limit for consumption is 151.72 g meat/week (for adult 50 kg body weight) and 45.52 g meat/week (for child 15 kg body weight).
The aim of the study was to reveal spatial-temporal distribution of the blue swimming crab(Portunus pelagicus Linnaeus 1758) in terms of size and gonad maturity stage of both male andfemale. Sampling of crab was conducted with a gill net from April 2013 until March 2014 inLasongko Bay. Of the whole population the mean size of male was smaller than that of females.Spatially smaller crabs (juveniles and young ones) inhabited mostly inner side of the bay, whilemedium size crabs occurred in the middle part of the bay. Big crabs were mostly found in theouter side of the bay. In terms of time, big sise of male and female crabs were collected inperiod of October to November and September to March, respectively. Small size of male andfemale occurred in February to September and in April, respectively. Related to gonad maturity,the sizes of both sexes with mature stages were variable. Ovigerous female (OF) was presencewidely in the bay, but the size of ovigerous females living in the shallow part of the bay wassmaller than those living in the deeper part. Keywords: blue swimming crab, size distribution, carapace width, spatial-temporal, gonadmaturity
Segara Anakan is a semi-close water ecosystem which is connected to Donan River (industrial and residential areas) in the east and Citanduy River (agricultural area) in the west. Most activity in those areas can produce a waste which becomes sources of harmful pollutants to the aquatic environment. The aim of this study was to analyze the content level of heavy metals (Pb, Hg, Cu and Cd) in muscle and safety level consumption of the tank goby (<em>Glossogobius giuris</em>) in the area. This study was conducted for 4 months in June, August, September and October 2017 at the waters of East Segara Anakan Lagoon of Cilacap (Central Java Province), The heavy metal concentration in the muscle was measured by AAS (Atomic Absorption Spectrophotometer). Based on the analysis, the heavy metal contents of Pb, Hg, Cu, and Cd in the tank goby were 0-0.005 mg/kg, 0-0.044 mg/kg, 0.164-0.293 mg/kg, and 0.001-0.032 mg/kg, respectively and these contents were under the safety limit. Safety level of consumption of the fish was 837.3 g/week (for adult) and 251.2 g/week (for children).<br /><br />
The source of iron in waters can come from human activities that carry out activities such as waste disposal in household and industrial activities. Green mussels containing iron are very dangerous for the shells themselves and for human health if consumed in excess. This study aims to analyze the concentration of iron in green mussel meat, determine the safe limit of green mussel meat for consumption by humans, and calculate the value of bioconcentration factors. This research was conducted in the sea of Tanjung Mas, Semarang. Samples taken in the form of green mussels, sediments, and water were then analyzed for iron concentrations with Atomic Absorption Spectrophotometer. The results of the study showed that the range of iron concentration values in green mussels from July to November was 39–283,97 mg/kg. The range of MTI values for adults was 1.18–4.92, while for children the range was 0.24–0.98. The value of the bioconcentration factor of green mussels and water was 3271–24839, while the value of the bioconcentration factor of green mussels and sediments was 0.010–9.647. Keywords: bioconcentration, green mussels, iron, maximum tolerable intake, Tanjung Mas
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