POPULATION TREND OF THE INVASIVE BLUE CRAB CALLINECTES SAPIDUS RATHBUN,1896 IN PATOKU LAGOON.

The blue crab Callinectes sapidus is one of the 23 marine alien species reported for the Albanian coast so far (Beqiraj et al., 2012; Katsanevakis et al., 2011). The first scientific report on the presence of this species in the Albanian coast is in 2009, in Patoku Lagoon. The blue crab population in Patoku Lagoon had grown significantly by 2009 and the blue crab had started to be traded. The data collected in that year showed that this species is assessed to be established in the Patoku Lagoon (Beqiraj & Kashta, 2010). Special attention has been paid to the study of blue crab population in the following years during 2010 - 2015. The aim of this study is to evaluate the development and population trend of blue crab in the Patoku Lagoon referring to the data collected throughout years of study.

Jual Beli Kepiting Ditinjau Dari Sad Adz Dzariah Dan Peraturan Menteri Kelautan Dan Perikanan Republik Indonesia Nomor 12 Tahun 2020

In the practice of buying and selling crabs in the village of Meunasah Paya, the fishermen sell all the crabs they catch without sorting them out, whether they are small, large, laying eggs or not, and this is not in accordance with Permen KP number 12 of 2020 which only allows crabs above. 150 grams and crabs that are not in egg-laying condition. The formulation of the research problem is how the practice of buying and selling crabs in Meunasah Paya village, Manyak Payed district, Aceh Tamiang district and how is Sad Adz Dzariah's review and Regulation of the Minister of Maritime Affairs and Fisheries of the Republic of Indonesia Number 12 of 2020 on the practice of buying and selling crabs in Meunasah Paya village, Manyak Payed district, Aceh district Tamiang. The purpose of the study was to find out the practice of buying and selling crabs in Meunasah Paya village as well as a review of Sad Adz Dzariah and KP Ministerial Regulation number 12 of 2020 on the practice of buying and selling crabs in Meunasah Paya village, Manyak Payed district, Aceh Tamiang district. This research includes field research (Field Research) with qualitative descriptive analysis method. The results of the study concluded that in Meunasah Paya village, crab fishermen sell all the crabs they catch to collectors without looking at the standardization of Ministerial Regulation No. 12 of 2020 which has been determined whether large or small crabs, laying eggs or not, will still be sold to collectors. According to sad adz dzariah, the law of buying and selling crabs in Meunasah Paya village is divided into two, namely some are prohibited because they are not in accordance with the candy and this will damage the crab population in nature and some are not prohibited. Meanwhile, according to Permen KP Number 12 of 2020, the sale and purchase of crabs in the village of Meunasah Paya is also divided into two, namely, some are appropriate and some are not.

Pemanfaatan Tambak Tradisional untuk Budi Daya Kepiting Bakau

Traditional pond is aquaculture place from the conversion of mangrove forests. The tradisional ponds in this area are still surrounded by mangrove, and many of which are still overgrown with mangroves in the pond. The traditional ponds are to aquaculture of shrimp and milkfish. Currently due to the decrease in environmental carrying capacity in traditional ponds cause a decrease of production. So there needs to be another alternative to optimize aquaculture ponds, namely by changing the types of animals reared from shrimp to mud crabs. Mud crab is a commodity economic value and lives naturally in the mangrove ecosystem. The increasing demand of mud crab causes an increase to catch of crab in nature. If the fishing effort is carried out in a sustainable manner without efforts to aquaculture of mud crabs there will be a decline population of mud crab in the future. These two problems, if put together will become a solution that have the potential to have economic value for increasing the mud crab population and have productive value for tradisional pond, namely by developing crab cultivation in traditional ponds. This book reveals how to manage traditional ponds into good aquaculture lands and make optimal use of this land to develop several aquaculture businesses of mud crabs.

The density of the Atlantic marsh fiddler crab (Minuca pugnax, Smith, 1870) (Decapoda: Brachyura: Ocypodidae) in its expanded range in the Gulf of Maine, USA

The Atlantic marsh fiddler crab, Minuca pugnax (Smith, 1870), is a climate migrant that recently expanded its range northward into the Gulf of Maine. We tracked the M. pugnax population within the Great Marsh, in northeastern Massachusetts, USA, since it was first detected in 2014 using burrow counts. Because burrow counts can overestimate fiddler-crab density, we used camera traps to determine the relationship between burrow densities and fiddler-crab densities in 2019. The burrow count surveys show a six-fold increase in the density of M. pugnax in the Great Marsh from 2014 to 2019. Results indicates that the fiddler-crab population in the expanded range is established and growing. Based on burrow counts, however, the density of M. pugnax in the expanded range (6 burrows m–2) remains much lower than those found in the historical range (up to 300 burrows m–2). Based on the camera traps, we determined that burrow counts overestimated fiddler-crab densities by 47% in 2019. There was, on average, one crab detected for every two burrows observed. This result suggests that estimates of densities of M. pugnax based on burrow counts should be reduced by half. Minuca pugnax is an ecosystem engineer that can influence saltmarsh functioning and the magnitude of that influence is related to its density. Our results imply that the populations of M. pugnax in the expanded range are currently having minor impacts on marshes relative to larger populations in the historical range, but their impact will increase as the populations grow.

Current state of stock and fishery of red king crab Paralithodes camtschaticus at West Kamchatka

Current state of the red king crab population at West Kamchatka is considered on the data of bottom trawl surveys and fishery statistics since 2013. Some biological parameters of the crabs and assessments of the commercial stock are presented; recent condition of the red king crab fishery and evaluation of the total allowable catch are discussed. The red king crab fishery was resumed in 2013, after 8 years of ban caused by the population decrease. During the ban, the stock restored and exceeded the value observed before the ban: the total accounted abundance of red king crab in 2017 was about 244 . 106 ind. that was the highest level for the last two decades, with the number of commercial males estimated as 110 . 106 ind. — this amount was never observed before on the shelf of western Kamchatka, at least in four decades of surveys. Recently the northern forbidden district and Khayryuzovsky district of the shelf zone lost their role of the main areas of crabs reproduction and their juveniles feeding, in favour to the Ichinsky district located southward. Recent fishery of red king crab is fruitful and sustainable. In the last 3 years, the major part of annual catch is transported alive to ports of China and South Korea. For this purpose, the caught crabs are sorted strictly aboard fishing vessels and the largest males are released back to the sea. Possibly, year-to-year increasing of the males size on the West Kamchatka shelf is caused by this sorting and releasing; another effect of the large-sized crabs releasing is relatively low number of recruits in the last couple of years. The fishery elimination coefficient is estimated in the range 5–16 % of the total accounted stock for 2013–2019, that shows a highly precautionary approach. Gradual decreasing of the crab commercial stock is forecasted for the nearest future, though the stock will remain above the target value. Current state of the red king crab population at West Kamchatka is not considered as dangerous, and ongoing intense fishery of this valuable species within the recommended volumes will not affect this sustainable state.

Combining data from different sampling methods to study the development of an alien crab Chionoecetes opilio invasion in the remote and pristine Arctic Kara Sea

Data obtained using three different types of sampling gear is compared and combined to assess the size composition and density of a non-indigenous snow crab population Chionoecetes opilio in the previously free of alien species Kara Sea benthos. The Sigsbee trawl has small mesh and catches even recently settled crabs. The large bottom trawl is able to catch large crabs, but does not retain younger crabs, due to its large mesh. Video sampling allows the observation of larger crabs, although some smaller crabs can also be spotted. The combined use of such gear could provide full scope data of the existing size groups in a population. The density of the crabs was calculated from the video footage. The highest figures were in Blagopoluchiya Bay at 0.87 crabs/m2, where the settlement seems to be reaching its first peak of population growth after the introduction. High density in the Kara Gates Strait at 0.55 crabs/m2, could be due to the close proximity of the Barents Sea from where the crabs can enter by both larval dispersal and active adult migration. All size groups have been present in most sampled areas, which suggest successful settlement and growth of crabs over a number of years. Again, this was not the case in Blagopoluchiya Bay with high density of small crabs (<30 mm CW), which confirms its recent population growth. Male to female ratio was strikingly different between the bays of the Novaya Zemlya Archipelago and west of the Yamal Peninsula (0.8 and 3.8 respectively). Seventy five ovigerous females were caught in 2016, which confirms the presence of a reproducing population in the Kara Sea. The spatial structure of the snow crab population in the Kara Sea is still in the process of formation. The presented data indicates that this process may lead to a complex system, which is based on local recruitment and transport of larvae from the Barents Sea and across the western Kara shelf; formation of nursery grounds; active migration of adults and their concentration in the areas of the shelf with appropriate feeding conditions.

CURRENT STATE OF STOCK FOR TANNER CRAB CHIONOECETES BAIRDI RATHBUN, 1924 (CRUSTACEA, DECAPODA) AT THE SOUTH-EASTERN COAST OF KAMCHATKA

Tanner crab Chionoecetes bairdi is the highly valuable object of commercial fishery dwelling in the seas surrounding Kamchatka Peninsula. Its landings started at the southeastern coast of Kamchatka in early 1980s and continued till 2009, when the fishery was stopped by reasons independent on the stock state. It was launched again in 2017. Now the species is landed mostly in the Petropavlovskaya fishery subzone (62 % of the total allowable catch of tanner crab in Russia in 2019), whereas its stocks at southwestern Kamchatka and in the northwestern Bering Sea are rather low. Modern condition of the tanner crab population and its distribution at southeastern Kamchatka are considered on the data of the trap surveys conducted in spring and summer of 2012 and 2018. Between these years, commercial males of these species spread wider at southeastern Kamchatka and formed commercial aggregations in the northern Avachinsky Bay and in the southern and central parts of the Kronotsky Bay, but were rare southward from Cape Povorotny. They became larger: while size of the males varied in the range 50–170 mm in both years, the males with the carapace width < 120 mm prevailed in 2012, but the large-sized males with commercial size were more numerous in 2018. Percentage of the females in the catches was low both in 2012 and 2018 that is typical for the trap catches. The crabs at the 3rd stage of molting dominated both in May and August of 2012 and 2018. Injury level of the commercial males was rather high and increased from 2012 to 2018 in 8 %. Good current condition of the tanner crab population at southeastern Kamchatka is concluded.