Bioaccumulation and maternal transfer of two understudied DDT metabolites in wild fish species

Author(s):  
Wen-Lu Feng ◽  
Jiang-Ping Wu ◽  
Xiao Li ◽  
You-Tian Nie ◽  
Ya-Chun Xu ◽  
...  
2020 ◽  
Vol 100 (7) ◽  
pp. 1171-1179
Author(s):  
Okan Akyol ◽  
Aytaç Özgül ◽  
F. Ozan Düzbastılar ◽  
Halil Şen ◽  
José M. Ortiz de Urbina ◽  
...  

AbstractThis study aims to determine the relationship between physico-chemical variables on a seasonal basis and wild fish assemblages beneath sea-cage fish farms. Assemblages of wild fish were counted monthly on two separate days at each of six fish farms between August 2015 and July 2017, by six rapid visual counts (RVC) in 5 minutes with scuba by two divers. Seawater samples were simultaneously taken by a Nansen bottle during the RVC from the fish farm barge. SST (°C), salinity (ppm), dissolved oxygen (mg l−1) and pH were measured by YSI multiparameter, while Secchi disk was also used for light transmittance. Wild fish species richness went up with increasing temperature and salinity in the Izmir region, however, this stopped at about 26°C and about 39 ppm. Wild fish richness increased when the DO was at a level of 7 mg l−1 and the pH at about 7.9 in Izmir. Between 10 and 20 m, light transmittance showed greater wild fish species richness in Izmir region. In contrast, the wild fish species richness of the Muğla region fluctuated more. In terms of wild fish species richness, these fluctuations increased with salinity and DO, while they decreased with SST, pH and light transmittance. However, the range of variation of the recorded physico-chemical variables is rather narrow. The results of the correlation matrix indicate that the relationship between wild fish species richness and pH and SST was statistically significant in Izmir region (P < 0.05).


1998 ◽  
Vol 64 (1) ◽  
pp. 148-154 ◽  
Author(s):  
Mutsuyosi Tsuchimoto ◽  
Takaharu Yamaga ◽  
Kyung Hee Lee ◽  
Zihua Wu ◽  
Tosio Misima ◽  
...  
Keyword(s):  

2015 ◽  
Vol 39 (5) ◽  
pp. 625-628 ◽  
Author(s):  
M Fabian ◽  
A Baumer ◽  
M Adamek ◽  
D Steinhagen

2018 ◽  
Vol 75 (4) ◽  
pp. 1258-1268 ◽  
Author(s):  
Björn Björnsson

Abstract In marine fisheries, considerable development has occurred in capture technology. Yet, some of the current fishing methods impact the environment by large greenhouse gas emission, harmful effects to benthic communities, and/or high bycatch of juvenile and unwanted species. It is proposed that for some fish species these deficiencies could be mitigated by classical conditioning using sound and food reward to concentrate wild fish before capture with environmentally friendly fishing gear. Atlantic cod (Gadus morhua), which globally is among the fish species with the highest landed value, can be acoustically trained. In a sea cage, it takes about a week to train a group of naïve cod to associate low frequency (250 Hz) sound with food, whereas the training of a group of naïve cod accompanied with one trained cod takes less than a day. In inshore areas, it takes a few weeks to attract thousands of cod to stations where food is regularly delivered. These conditioned cod wait at the stations for their meals and do not mingle much with the unconditioned cod which hunt for wild prey. It is suggested that by calling acoustically conditioned fish between stations, a much larger number of naïve fish can be gathered. This so-called fish aggregating sound technique (FAST) may thus facilitate the accumulation of wild fish and expedite their capture with a purse seine or a trap in a way that minimizes fuel consumption and mortality of juveniles and unwanted species. The operation of FAST requires exclusive rights of a designated fishing area. The exclusivity makes it possible to on-grow the fish in free-ranging schools and sea cages for several months to increase their size and food quality before capture.


2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Jimlea Nadezhda Mendoza ◽  
Giulia Mattalia ◽  
Baiba Prūse ◽  
Sophia Kochalski ◽  
Aimee Ciriaco ◽  
...  

AbstractSeveral coastal communities rely heavily on wild-caught fish for personal consumption and their livelihoods, thus being sensitive to the rapid global change affecting fish availability. However, in the last century, aquaculture has been increasingly adopted. To understand the uses and changes of wild-caught fish, we conducted 30 semi-structured interviews with fishers of Laguna Lake, Philippines. Fishermen, with up to 60 years’ experience, reported catching 31 fish species as a staple food. The taxa with the greatest variety of food uses were the farmed Oreochromis aureus, and the wild Channa striata and Cyprinus carpio. Fish was boiled, fried, grilled and dried, and over 20 different local dishes were reported. Fishers reported that local communities previously relied more on wild fish, while today a greater proportion of consumed fish comes from aquaculture fish species such as Oreochromis aureus and Hypophthalmichthys nobilis. Wild fish remains a crucial aspect of local gastronomic diversity, underpinning the biodiversity of the Laguna Lake, while also representing an important element for food sovereignty. The study stresses the need to sustain local ecological knowledge to ensure the ecological, social and economic sustainability of the communities.


Author(s):  
Cassidy M. Hahn ◽  
Luke R. Iwanowicz ◽  
Robert S. Cornman ◽  
Patricia M. Mazik ◽  
Vicki S. Blazer

Sign in / Sign up

Export Citation Format

Share Document