Socioekonomski uzroci i alohtone vrste slatkovodnih rakova u Evropi

Strane vrste slatkovodnih rakova (NICS) prelaze po brojnosti autohtone u mnogim evropskim zemljama, predstavljajući pretnju biodiverzitetu zbog širenja "kuge" rakova, agresivne invazije i antagonističkog delovanja. Iako je biološka osnova ovog stanja dobro proučena, moguća uloga socijalnih, ekonomskih i demografskih činilaca za ovu situaciju je praktično ignorisana. U pokušaju da se ispitaju takvi odnosi, mi predlažemo da je gustina ljudske populacije i ekonomski rast meren kao rast domaćeg proizvoda (GDP) per capita pozitivno povezan sa povećanim brojem NICS-a u Evropskoj Uniji. Ovo je očigledno u zemljama sa većim ukupnim ekološkim tragom. U gornjem kontekstu hitno su potrebne akcije da se povrate/uravnoteže postojeće i projektovane ekološke promene prouzrokovane prisustvom NICS-a

Do low price fish, have high nutritional value?

The aim of this paper was to compare the nutritional value of some low price fish (Sardina pilchardus, Engraulis encrasicholus, Anguilla anguilla, Salmo trutta, Mugil chepalus) to high price fish with high consumption rate (Sparus aurata, Merluccius merluccius, Dicentrarchus labrax).In general, the commercial values of several fish species in Greece was not always related with the nutritional value (proteins, lipids and polyunsaturated fatty acids). Despite the price differences, total lipid content is higher in eel (Anguilla anguilla) and grey mullet (Mugil chephalus), compared to other species. Moreover, concerning unsaturated fatty acid content, there are significant differences in favour of grey mullet and sardine (Sardina pilchardus). Differences in favour of eel are also reported for cholesterol, as well as differences in energy content in favour of eel and grey mullet. Absorption index for all species was higher than 0.92. In conclusion, fish with very low price seem to have the same or higher nutritional and energy value, compared to highly priced fish.Includes research findings and presentation

Freshwater crayfish distribution update and maps for Greece: combining literature and citizen-science data

Crayfish are charismatic creatures of high interest to humans, among others playing key roles in freshwater ecosystems. Considering the significance of indigenous crayfish species (ICS) as well as the risks posed by non-indigenous crayfish species (NICS) that may dissemite a crayfish plague pathogen Aphanomyces astaci, astacological research has advanced particularly in Europe. In this context, crayfish distribution patterns are of fundamental importance. Focused on all crayfish established in the Greek wild, we provide an updated distribution and maps, combining extensive review of existing literature as well as newly emerging sources, largely represented by increasingly important citizen-science data. Obtained results demonstrate that ICS, mainly the Astacus astacus and Austropotamobius torrentium, remain relatively well settled in the country. The last ICS, Astacus leptodactylus, was translocated in few places outside its native range, leading to the formation of new flourishing populations and at least in one case it sustains commercial exploitation. Concerning NICS, a single population of Pacifastacus leniusculus is also established in the artificial lake Agra (Region of Central Macedonia) and keeps spreading. Unfortunately, there are only few methods under a very narrow range of conditions making successful eradication of unwanted NICS populations feasible. This option is even more difficult as this population is commercially exploited and traded. Since further potentially problematic NICS are also pet-traded in the country, educating public and communicating highlighted issues are the most effective ways limiting their releases and consecutive establishment in the wild

A global review and meta-analysis of applications of the freshwater Fish Invasiveness Screening Kit

The freshwater Fish Invasiveness Screening Kit (FISK) has been applied in 35 risk assessment areas in 45 countries across the six inhabited continents (11 applications using FISK v1; 25 using FISK v2). The present study aimed: to assess the breadth of FISK applications and the confidence (certainty) levels associated with the decision-support tool’s 49 questions and its ability to distinguish between taxa of low-to-medium and high risk of becoming invasive, and thus provide climate-specific, generalised, calibrated thresholds for risk level categorisation; and to identify the most potentially invasive freshwater fish species on a global level. The 1973 risk assessments were carried out by 70 + experts on 372 taxa (47 of the 51 species listed as invasive in the Global Invasive Species Database www.iucngisd.org/gisd/), which in decreasing order of importance belonged to the taxonomic Orders Cypriniformes, Perciformes, Siluriformes, Characiformes, Salmoniformes, Cyprinodontiformes, with the remaining ≈ 8% of taxa distributed across an additional 13 orders. The most widely-screened species (in decreasing importance) were: grass carp Ctenopharyngodon idella, common carp Cyprinus carpio, rainbow trout Oncorhynchus mykiss, silver carp Hypophthalmichthys molitrix and topmouth gudgeon Pseudorasbora parva. Nine ‘globally’ high risk species were identified: common carp, black bullhead Ameiurus melas, round goby Neogobius melanostomus, Chinese (Amur) sleeper Perccottus glenii, brown bullhead Ameiurus nebulosus, eastern mosquitofish Gambusia holbrooki, largemouth (black) bass Micropterus salmoides, pumpkinseed Lepomis gibbosus and pikeperch Sander lucioperca. The relevance of this global review to policy, legislation, and risk assessment and management procedures is discussed

483.pdf

The aim of this paper was to compare the nutritional value of some low price fish (Sardina pilchardus, Engraulis encrasicholus, Anguilla anguilla, Salmo trutta, Mugil chepalus) to high price fish with high consumption rate (Sparus aurata, Merluccius merluccius, Dicentrarchus labrax).In general, the commercial values of several fish species in Greece was not always related with the nutritional value (proteins, lipids and polyunsaturated fatty acids). Despite the price differences, total lipid content is higher in eel (Anguilla anguilla) and grey mullet (Mugil chephalus), compared to other species. Moreover, concerning unsaturated fatty acid content, there are significant differences in favour of grey mullet and sardine (Sardina pilchardus). Differences in favour of eel are also reported for cholesterol, as well as differences in energy content in favour of eel and grey mullet. Absorption index for all species was higher than 0.92. In conclusion, fish with very low price seem to have the same or higher nutritional and energy value, compared to highly priced fish

483ppt.pdf

The aim of this paper was to compare the nutritional value of some low price fish (Sardina pilchardus, Engraulis encrasicholus, Anguilla anguilla, Salmo trutta, Mugil chepalus) to high price fish with high consumption rate (Sparus aurata, Merluccius merluccius, Dicentrarchus labrax).In general, the commercial values of several fish species in Greece was not always related with the nutritional value (proteins, lipids and polyunsaturated fatty acids). Despite the price differences, total lipid content is higher in eel (Anguilla anguilla) and grey mullet (Mugil chephalus), compared to other species. Moreover, concerning unsaturated fatty acid content, there are significant differences in favour of grey mullet and sardine (Sardina pilchardus). Differences in favour of eel are also reported for cholesterol, as well as differences in energy content in favour of eel and grey mullet. Absorption index for all species was higher than 0.92. In conclusion, fish with very low price seem to have the same or higher nutritional and energy value, compared to highly priced fish

Origin of broodstock and effects on the deformities of gilthead sea bream (Sparus aurata L. 1758) in a Mediterranean commercial hatchery

Abstract The use of broodstock of different origin as a method to improve fry production performance and consequently to minimize deformities was examined at industrial scale in a commercial gilthead sea bream hatchery. The outcome of fry production from three different broodstock groups (BA: broodfish (Mediterranean) with multiannual hatchery presence, BB: selected offspring originating from the BA group, and BC: broodfish of Atlantic origin) was investigated in the same rearing conditions and feeding protocol. Performance factors assessed were the survival and weaning of the larvae; the mortality rates from the “weaning until the end of the hatchery stage” of the larvae/fry; the percentage of fry without swim bladder; the percentage of fry with skeletal deformities and the feed conversion ratio. In all factors, no statistical differences among the experimental groups were detected. However, due to early rejection of the deformed individuals, benefits are expected from the decrease of the supplied amount of food and the reduced labor cost

Pituitary Collection from Gibel Carp Carassius gibelio (Bloch 1782) in Lake Pamvotis (Greece): Prospects for Use in Carp Reproduction

Gibel carp (Carassius gibelio Bloch, 1782) is regarded as a pest species in most aquatic ecosys- tems where it occurs and eradication methods have not been very promising. However, because of the close taxonomical proximity between gibel carp and cultured cyprinids, the pituitary of gibel carps could be exploited for hormonal induction of artificial propagation in aquaculture. Thirty-two mature female gibel carps were electrofished in Lake Pamvotis (northwest Greece) in March 2005 and their pituitaries were collected and processed. The carp luteinizing hormone (cLH) levels in 20 pituitaries were assayed and found to correlate with total body weight, total length, dry pituitary weight, and gonadosomatic index. The cLH levels were in the same range as cLH levels in pituitaries of common carp (Cyprinus carpio Linnaeus, 1758) used in Israeli hatcheries for artificial propagation. Hence, it may be possible to use gibel carp pituitaries for hormonal induction in cyprinids, with total weight of the gibel carp as a field criterion for select- ing pituitary donors