scholarly journals On the use of omnidirectional sonars and downwards-looking echosounders to assess pelagic fish distributions during and after midwater trawling

2012 ◽  
Vol 70 (1) ◽  
pp. 196-203 ◽  
Author(s):  
Jason D. Stockwell ◽  
Thomas C. Weber ◽  
Adam J. Baukus ◽  
J. Michael Jech
Keyword(s):  
Gulf Of Maine ◽  
Pelagic Fish ◽  
Clupea Harengus ◽  
Small Pelagic Fish ◽  
Potential Applications ◽  
Fish Aggregation ◽  
And Function ◽  
The Impact ◽  
Size Estimates ◽  
Fish Distributions

Abstract Stockwell, J. D., Weber, T. C., Baukus, A. J., and Jech, J. M. 2013. On the use of omnidirectional sonars and downwards-looking echosounders to assess pelagic fish distributions during and after midwater trawling. – ICES Journal of Marine Science, 70:196–203. Small pelagic fish can play an important role in the structure and function of ecosystems, and there is increasing interest in their non-market value. At the scale of fish aggregations, however, the impact of fishing has received relatively little attention, with most effort devoted to impacts of vessel and gear avoidance on stock size estimates. We used concurrent deployment of a downwards-looking echosounder (Simrad ES60 system) and an omnidirectional sonar (Simrad SP90 system) during commercial pairtrawling operations for Atlantic herring (Clupea harengus) in the Gulf of Maine to examine their potential for studying the impacts of fishing on herring aggregations. We compared a number of aggregation metrics to illustrate similarities and differences between the two systems, and then qualitatively examined their properties during and after pairtrawling events to illustrate potential applications. Our results suggest that using both downwards-looking and omnidirectional systems provides complementary information on fish aggregation metrics. Future applications of these systems in before–after–control-impact (BACI) designs may help inform management agencies when evaluating potential impacts of fishing at the time and space scales of pelagic fish aggregations.

scholarly journals Consumption impacts by marine mammals, fish, and seabirds on the Gulf of Maine–Georges Bank Atlantic herring (Clupea harengus) complex during the years 1977–2002

2006 ◽  
Vol 64 (1) ◽  
pp. 83-96 ◽  
Author(s):  
W. J. Overholtz ◽  
J. S. Link
Keyword(s):  
Marine Mammals ◽  
Diet Composition ◽  
Gulf Of Maine ◽  
Demersal Fish ◽  
Pelagic Fish ◽  
Clupea Harengus ◽  
Sensitivity Analyses ◽  
Atlantic Herring ◽  
Georges Bank ◽  
The Impact

Abstract Overholtz, W. J. and Link, J. S. 2007. Consumption impacts by marine mammals, fish, and seabirds on the Gulf of Maine–Georges Bank Atlantic herring (Clupea harengus) complex during the years 1977–2002. ICES Journal of Marine Science, 64: 83–96. A comprehensive study of the impact of predation during the years 1977–2002 on the Gulf of Maine–Georges Bank herring complex is presented. An uncertainty approach was used to model input variables such as predator stock size, daily ration, and diet composition. Statistical distributions were constructed on the basis of available data, producing informative and uninformative inputs for estimating herring consumption within an uncertainty framework. Consumption of herring by predators tracked herring abundance closely during the study period, as this important prey species recovered following an almost complete collapse during the late 1960s and 1970s. Annual consumption of Atlantic herring by four groups of predators, demersal fish, marine mammals, large pelagic fish, and seabirds, averaged just 58 000 t in the late 1970s, increased to 123 000 t between 1986 and 1989, 290 000 t between 1990 and 1994, and 310 000 t during the years 1998–2002. Demersal fish consumed the largest proportion of this total, followed by marine mammals, large pelagic fish, and seabirds. Sensitivity analyses suggest that future emphasis should be placed on collecting time-series of diet composition data for marine mammals, large pelagic fish, and seabirds, with additional monitoring focused on the abundance of seabirds and daily rations of all groups.

scholarly journals Impact of the Strong Downwelling (Upwelling) on Small Pelagic Fish Production during the 2016 (2019) Negative (Positive) Indian Ocean Dipole Events in the Eastern Indian Ocean off Java

Climate ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 29
Author(s):  
Jonson Lumban-Gaol ◽  
Eko Siswanto ◽  
Kedarnath Mahapatra ◽  
Nyoman Metta Nyanakumara Natih ◽  
I Wayan Nurjaya ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Indian Ocean Dipole ◽  
Pelagic Fish ◽  
Eastern Indian Ocean ◽  
Fish Production ◽  
Small Pelagic Fish ◽  
Field Surveys ◽  
Chl A ◽  
Positive Indian Ocean Dipole ◽  
The Impact

Although researchers have investigated the impact of Indian Ocean Dipole (IOD) phases on human lives, only a few have examined such impacts on fisheries. In this study, we analyzed the influence of negative (positive) IOD phases on chlorophyll a (Chl-a) concentrations as an indicator of phytoplankton biomass and small pelagic fish production in the eastern Indian Ocean (EIO) off Java. We also conducted field surveys in the EIO off Palabuhanratu Bay at the peak (October) and the end (December) of the 2019 positive IOD phase. Our findings show that the Chl-a concentration had a strong and robust association with the 2016 (2019) negative (positive) IOD phases. The negative (positive) anomalous Chl-a concentration in the EIO off Java associated with the negative (positive) IOD phase induced strong downwelling (upwelling), leading to the preponderant decrease (increase) in small pelagic fish production in the EIO off Java.

scholarly journals Productivity and Distribution of Fish Aggregation Devices (FADs) in Outer Ambon Bay Waters, Indonesia

Omni-Akuatika ◽  
2021 ◽  
Vol 17 (1) ◽  
pp. 19
Author(s):  
Delly Dominggas Paulina Matrutty ◽  
Jacobus Bunga Paillin ◽  
Stany Rachel Siahainenia ◽  
Welem Waileruny ◽  
K Rutumalessy
Keyword(s):  
Field Observation ◽  
Dominant Species ◽  
Average Distance ◽  
Pelagic Fish ◽  
Species Number ◽  
Catch Per Unit Effort ◽  
Small Pelagic Fish ◽  
Middle Group ◽  
Fish Aggregation ◽  
Distribution Of Fish

Distribution of small pelagis fish in FADs, and produktivity of FADs in AmFADs are usually used by fishermen to concentrate fish for an efficient catching activity. However, the number, distance, and distribution in the waters need to be assessed in relation to the productivity of the FADs in order to maintain the sustainability. This study was aimed to map the distribution of FADs; to analyze the distribution of species, number and size of fish associated with FADs; and to calculate FAD productivity based on distribution in the Outer Ambon Bay waters. Data was obtained by observation and interview. Field observation, including: coordinates and number of FADs, species, number and size of fish. The distance and distribution of FADs, was mapped using software (Argis web), while the productivity of FADs was analyzed base on catch per unit effort (CPUE). The result, FAD in Outer Ambon Bay waters was found 25 unit and the average distance of FAD was obtained 0.47 nautical miles, and the placement of the device was irregular. The placement pattern of FADs were generally straight to coastline. Small pelagic fish was found 7 species and the 5 of the dominant species were obtained Decapterus sp, Selar crumenophthalmus, Rastreliger sp, Sardinella sp and Selaroides sp. The species were unevenly spread at each FAD with quite varied sizes. FAD productivity showed that the highest productivity was found in the middle group FAD at Ambon Bay waters.Keywords: Distance, size, small pelagis, productivitybon Bay

scholarly journals Artificial skin composites

2019 ◽  
Vol 73 (1) ◽  
pp. 51
Author(s):  
Agata Ładniak
Keyword(s):  
Wound Dressings ◽  
Skin Damage ◽  
Skin Substitutes ◽  
Significant Deterioration ◽  
Form And Function ◽  
Potential Applications ◽  
And Function ◽  
The Impact

<p>Skin injuries are a health problem and can lead to serious, significant deterioration in the quality of life and, consequently, even illness and disability. Therefore, after wounding, immediate regeneration of the tissue is necessary to avoid further complications and pathogenesis. Consequently, many wound healing strategies have been developed, leading to the progress in constructing of multifunctional tissue substitutes for the skin, biomembranes, scaffolds and intelligent dressings. The field of science focusing on the creation of the above-mentioned products is tissue engineering (TE). Its main goal is to find a system that is able to replace or be a model that perfectly mimics the form and function of the skin. Research carried out on such constructs is mainly based on the analysis of mechanical properties (porosity, elasticity), as well as the assessment of the impact of individual components on processes related to the formation of new tissue as cell proliferation and differentiation, proliferation, angiogenesis - through <em>in vivo</em> studies (using animal models: mice, New Zealand rabbits) and <em>in vitro</em> (most often using mouse fibroblasts - L929). Skin constructions may have potential applications as wound dressings or skin substitutes in cases of severe skin damage.</p>

scholarly journals Recent changes in the diet and survival of Atlantic puffin chicks in the face of climate change and commercial fishing in midcoast Maine, USA

FACETS ◽  
2017 ◽  
Vol 1 (1) ◽  
pp. 27-43 ◽  
Author(s):  
Stephen W. Kress ◽  
Paula Shannon ◽  
Christopher O’Neal
Keyword(s):  
Body Weight ◽  
Gulf Of Maine ◽  
Clupea Harengus ◽  
Sea Surface ◽  
Melanogrammus Aeglefinus ◽  
Commercial Fishing ◽  
Surface Warming ◽  
Recent Climate ◽  
The Impact ◽  
Atlantic Puffin

We examined the diet of Atlantic puffin ( Fratercula arctica) chicks at three midcoast Maine, USA, colonies during the years 2005–2014 and found that the puffins at each island have a distinct diet that has changed in recent years. White hake ( Urophycis tenuis) is by far the most frequently delivered prey at each island. Atlantic herring ( Clupea harengus) is the second most frequently delivered food, but has declined in recent years on two islands. In contrast, butterfish ( Poronotus triacanthus), haddock ( Melanogrammus aeglefinus), and redfish ( Sebastes spp.) have increased in the puffin diet on all islands. Chick condition declined significantly from 1993 to 2009. We demonstrate that puffin chicks with greater body weight experience a higher chance of postfledging survival as compared to chicks with lower body weight. The years 2012–2013 were a period of extreme sea surface warming, in which puffin hatching success and productivity sharply declined. This study provides new insight into changes in marine communities, examining changes in chick diet. We discuss our findings in relation to warming sea surface temperatures, recent climate-related decline in puffin productivity in the Gulf of Maine, and the impact of commercial fisheries on forage fish.

scholarly journals The Strong Downwelling (Upwelling) Impact on Small Pelagic Fish Production During the 2016 (2019) Negative (Positive) Indian Ocean Dipole Events in the Eastern Indian Ocean off Java

2020 ◽  
Author(s):  
Jonson Lumban-Gaol ◽  
Eko Siswanto ◽  
Nyoman Metah N. Natih ◽  
I Wayan Nurjaya ◽  
Mochammad Tri Hartanto ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Phytoplankton Biomass ◽  
Pelagic Fish ◽  
Eastern Indian Ocean ◽  
Fish Production ◽  
Small Pelagic Fish ◽  
Field Surveys ◽  
Chl A ◽  
Positive Indian Ocean Dipole ◽  
The Impact

Although researchers have investigated widely the impact of IOD phases on human lives, only a few have examined such impacts on fisheries. In this study, we analyzed the influence of negative (positive) of IOD on a chlorophyll a (Chl-a) concentration as an indicator of phytoplankton biomass and small pelagic fish production in the eastern Indian Ocean (EIO) off Java. We also conducted field surveys in the EIO off Palabuhanratu Bay at the peak (October) and the end (December) of the 2019 positive IOD phase. Our findings show that the Chl-a concentration had a strong and robust association with the 2016 (2019) negative (positive) IOD phases. The negative (positive) anomalous Chl-a concentration in the EIO off Java associated with the negative (positive) IOD phase induced strong downwelling (upwelling), leading to the preponderant decrease (increasing) of small pelagic fish production in the EIO off Java.

scholarly journals RANCANG BANGUN DAN UJI COBA ALAT PEMANGGIL IKAN “PIKNET” UNTUK ALAT TANGKAP JARING INSANG

2018 ◽  
Vol 9 (2) ◽  
pp. 199
Author(s):  
Nurul Rosana ◽  
. Suryadhi ◽  
Safriudin Rifandi
Keyword(s):  
Pelagic Fish ◽  
Average Weight ◽  
Fishing Gear ◽  
Sound Waves ◽  
Small Pelagic Fish ◽  
Test Analysis ◽  
Chicken Feathers ◽  
Device Model ◽  
Fish Aggregation ◽  
Paired T Test

<p align="center"><strong><em>ABSTRACT</em></strong><strong><em></em></strong></p><p class="Abstractisi">Gillnet is one of the fishing gear used by Indonesian fishermen especially in East Java, with the target of small pelagic fish. The use of gillnet needs an innovation which can help fishermen to increase their catchment, namely by using Fish Aggregation Device (FAD). The objective of the research is to make a fish caller device model using sound waves that are operated on the gillnet and looking its effectiveness by conducting trials in the water. The fish caller is made using sound waves at the frequency between 500-1000 Hz, and named as Piknet (Pemanggil ikan gillnet).  The Piknet dimension after waterproof packed  is 20 cm long x 8.5 cm wide x 6.5 cm high.   The type of fish caught in this research was chicken feathers (Thryssa setirostris) with an average weight of 27.6 kg/per trip in piknet trial while without using Piknet is 17.7 kg/trip. The result of paired t-test analysis presented that there was a significant value of 0.016.   </p><p class="TubuhTulisanAll"><strong><em>Keywords:</em></strong><strong><em> </em></strong><em>sound, frequency, gillnet, piknet</em><em></em></p><p align="center"><strong>ABSTRAK</strong></p><p class="Abstrakisi">Jaring insang adalah jenis alat tangkap ikan yang digunakan oleh nelayan di Indonesia dan Jawa Timur khususnya, dengan target tangkapan ikan pelagis kecil.  Penggunaan alat tangkap jaring insang memerlukan inovasi yang dapat membantu nelayan untuk meningkatkan hasil tangkapan, yaitu dengan menggunakan alat bantu pengumpul ikan.  Tujuan penelitian adalah membuat model alat pemanggil ikan berbasis gelombang bunyi yang dioperasikan pada jaring insang dan mengetahui efektivitasnya dengan melakukan uji coba di perairan.  Alat pemanggil ikan dibuat dengan menggunakan gelombang bunyi berfrekuensi antara 500-1000 Hz, dan diberi nama Piknet (Pemanggil ikan <em>gillnet</em>).  Dimensi Piknet setelah dikemas kedap air adalah memiliki panjang 20 cm x lebar 8,5 cm x tinggi 6,5 cm. Jenis ikan yang diperoleh pada uji coba ini adalah bulu ayam (<em>Thryssa setirostris</em>) dengan rata-rata jumlah hasil tangkapan 27,6 kg/trip, sedangkan tanpa menggunakan “Piknet” sebesar 17,7 kg/trip.  Hasil analisis uji-t berpasangan diperoleh hasil nilai signifikansi sebesar 0.016..</p><strong>Kata kunci:</strong> bunyi, frekuensi, jaring insang, piknet

Surgery for Lung Cancer and the Consequences for the Swallow

2016 ◽  
Vol 1 (13) ◽  
pp. 162-168
Author(s):  
Pippa Hales ◽  
Corinne Mossey-Gaston
Keyword(s):  
Lung Cancer ◽  
Treatment Options ◽  
Vocal Cord Palsy ◽  
Subsequent Treatment ◽  
Physiological Reserve ◽  
Palliative Phase ◽  
And Function ◽  
The Impact ◽  
Swallow Function

Lung cancer is one of the most commonly diagnosed cancers across Northern America and Europe. Treatment options offered are dependent on the type of cancer, the location of the tumor, the staging, and the overall health of the person. When surgery for lung cancer is offered, difficulty swallowing is a potential complication that can have several influencing factors. Surgical interaction with the recurrent laryngeal nerve (RLN) can lead to unilateral vocal cord palsy, altering swallow function and safety. Understanding whether the RLN has been preserved, damaged, or sacrificed is integral to understanding the effect on the swallow and the subsequent treatment options available. There is also the risk of post-surgical reduction of physiological reserve, which can reduce the strength and function of the swallow in addition to any surgery specific complications. As lung cancer has a limited prognosis, the clinician must also factor in the palliative phase, as this can further increase the burden of an already compromised swallow. By understanding the surgery and the implications this may have for the swallow, there is the potential to reduce the impact of post-surgical complications and so improve quality of life (QOL) for people with lung cancer.

Sign in / Sign up

Export Citation Format

Share Document