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This species' estuarine habitat along the eastern seaboard of North America has been heavily degraded. It is inferred that population declines of 30% or greater have happened due to habitat loss and degradation over the past century, however it is not clear whether a decline of 30% (or even close to this percentage) would have occurred within the 1...
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It is listed as Least Concern as this species is widespread in a region of relatively intact habitat, and
although subject to hunting and habitat loss, it is not believed to be declining fast enough to warrant
listing in a higher category of threat.
This species is listed as Least Concern as it occurs in an area of extensive, suitable habitat which appears not to be under threat, it has a presumed large population, and it is unlikely to be declining fast enough to qualify for listing in a threatened category.
This species is listed as Least Concern because although this species is very poorly known, it has a
relatively wide distribution range in the Horn region of Africa, where there are not believed to be any
major threats to this species or to its habitat. Indeed, it is likely to be locally common.
Micrognathus crinitus is widely distributed and utilizes a variety of habitat types. There are no known major threats. Therefore, it is listed as Least Concern.
This species is listed as Near Threatened as the known area of occupancy (AOO) is 144 km2 and there is a continuing decline in the extent and quality of the habitat due to agricultural expansion and intensification and urbanisation. This species is close to qualifying as threatened under criterion B2, but the population is not severely fragmented a...
Citations
... A subsequent study determined feeding habits of various species, including S. acus and S. abaster, from the Black Sea coast (Gürkan & Uncumusaoglu 2016). Both S. abaster and S. acus are listed in the Least Concern (LC) category of the International Union for Conservation of Nature (IUCN) Red List of Threatened Species (Smith-Vaniz 2015;Pollom 2016). Thus, the lack of knowledge about the populations of the two species is somewhat remedied, but there is a need for research on how these two species, adapted to estuarine systems, feed and share food in alluvial lake habitats. ...
The present study investigated the trophic ecology of two species living in an alluvial lake ecosystem in terms of season, length groups, sex, and mouth morphology. The fish were caught in a coastal lake area between December 2014 and March 2016 using a seine. In general, C. aquaedulcis was the most important prey for S. abaster , accounting for 10.99% of all prey, while amphipods accounted for 54.04% of the S. acus diet. Amphipods were the most frequently consumed prey in autumn, while C. aquaedulcis was the most important prey in spring. This result indicates that the species preferred similar prey groups and generated food competition depending on the season. The short-length group contained samples of S. abaster with empty guts, whereas S. acus in the same group consumed C. aquaedulcis . Length group II and III of individuals indicated that both species consumed amphipods and juvenile Syngnathus sp. Thus, the two species had statistically different preferences in terms of prey length. The mouth width of S. abaster was larger than that of S. acus . In conclusion, zooplankton constituted the main prey for both species in the lake and the morphological differences between the mouth apparatus of the species were due to the differences in feeding habits.
... The Swartvlei Estuary population is the most genetically distinct (Mkare et al. 2017). Despite all three known populations occurring within protected areas and there being no commercial or subsistence use of the species, population sizes are still thought to be declining because of habitat degradation across much of its range (Pollom 2017). Environmental management authorities have outlined strategies for the conservation of H. capensis, including listing it as a species of special concern in the Estuarine Lower Level Plan of the Garden Route National Park (South African National Parks 2020) and setting management objectives for the Keurbooms population in the Keurbooms-Bitou Estuarine Management Plan (Western Cape Government 2018). ...
... Also in agreement with our results, overexploitation of N. norvegicus has been indicated for the western Mediterranean (Sardà, 1998) although the population seems to be stable worldwide according to the International Union for Conservation of Nature (IUCN) in 2015 (Bell, 2015). No variation in Spanish Mediterranean landings since 1992 has been reported. ...
The overexploitation of marine resources has led to a decrease in species abundance over time in many marine ecosystems worldwide. But as new fishers arise throughout the years, the perception of local abundance changes which might result in a “shifting baselines syndrome”. We investigated how the perception of fishers about species abundance changed through time (from 1970 to 2016) and space (five ports), through questionnaires in the small-scale/artisanal fisheries of Murcia, Spain. Two major results emerged, firstly species catches significantly decreased between the decades 1970–1990 and 2000–2016, possibly due to overfishing and habitat degradation. Catches of species with some particular functional traits decreased (96%) possibly due to lower plasticity or to a “fishing down the food web” effect. Secondly, some functional trait categories (very large size, deep water depth, large yearly displacements and very vagile) were the highest in the northern ports of San Pedro del Pinatar and Cartagena while Cabo de Palos had the highest values in species with solitary and territorial behaviour and vagile or sedentary mobility. Fishers’ perception of catch trends of commercial species seemed aligned with other sources of information for this area and might be key information in the absence of more quantitative information.
Penelitian ini dilakukan selama enam bulan dari bulan Juni sampai November 2018 pada perairan Kepulauan Tanakeke Kabupaten Takalar. Jumlah tangkur buaya yang diperoleh pada lokasi pengambilan sampel Labbotallua sebanyak 88 ekor jantan dan 67 ekor betina pada lokasi pengambilan sampel Labbokatoang sebanyak 68 ekor jantan dan 52 ekor betina. Hasil penelitian menunjukkan Nisbah kelamin Syngnathoides biaculeatus (Bloch, 1785) pada lokasi labbotallua dan labbokatoang di Pulau Tanakeke Sulawesi Selatan yaitu 1.31:1 dapat dikatakan seimbang. Hasil analisis terhadap ukuran pertama kali matang gonad tangkur buaya pada kedua lokasi pengambilan sampel pada individu jantan mengalami kematangan gonad pertama kali yang lebih cepat pada ukuran 19.3038 mm dan 20.8287 mm sedangkan tangkur buaya betina pada ukuran 21.3192 mm dan 21.2339 mm.
The complete mitochondrial genome of Solegnathus hardwickii was determined to be 16,519 bp long circular molecule with a typical gene arrangement of vertebrate mitochondrial. The complete mitochondrial genomes were obtained by conventional and long PCR. Tree constructed using maximum likelihood based on protein-coding genes and ribosomal RNAs showed close relationship of S. hardwickii with Hippocampus spp.
