Article
Marine & Freshwater Biology
Noriko Akai, Michio Yoneda
Summary: This study on western sand lance revealed that the reproductive potential of 1-year-old sand lance has decreased, and the total egg production of spawning individuals has significantly reduced in recent years, possibly due to the decline in the abundance of 2 and 3-year-old fish.
JOURNAL OF SEA RESEARCH
(2021)
Article
Multidisciplinary Sciences
Md Sayeed Abu Rayhan, Md Shohanur Rahman, Protick Kumar Bose, Md Golam Sarower, Muhammad Yousuf Ali
Summary: This study determines the peak breeding season, first maturity, and egg characteristics of Hilsa shad through observation and analysis. The findings are significant for the conservation and management of Hilsa populations and contribute to the scientific community.
Article
Biochemistry & Molecular Biology
Charles D. Waters, Anthony Clemento, Tutku Aykanat, John Carlos Garza, Kerry A. Naish, Shawn Narum, Craig R. Primmer
Summary: Studying the genetic basis of age at maturity in four species of Pacific salmonids revealed heterogeneous genetic architecture of this key life-history trait across the species. While significant associations were found between six6 and age at maturity in two species, particularly strong in Steelhead, no significant associations were detected between vgll3 and age at maturity in any of the species.
Article
Fisheries
Torstein Pedersen, Colin Amundsen, Stephen Wickler
Summary: This study compared population characteristics and growth rates of Atlantic cod from different sites and time periods in northern Norway. The cod from pre-20th century were older and larger, while the modern cod were smaller in size. The increase in fishing activity resulted in a decrease in age distributions and longevity of the northeast Arctic cod population.
ICES JOURNAL OF MARINE SCIENCE
(2022)
Article
Multidisciplinary Sciences
Kellie J. Carim, Scott Relyea, Craig Barfoot, Lisa A. Eby, John A. Kronenberger, Andrew R. Whiteley, Beau Larkin
Summary: Human activities have fragmented fish habitat leading to isolated inland salmonid populations, which may lose migratory life histories and experience declines in population density and abundance. Ultrasound imaging has been tested as a non-invasive method to accurately identify maturing female Westslope Cutthroat Trout, with potential applications for studying reproductive status and promoting the persistence of isolated salmonid populations. Variations in size of maturing females among different wild populations indicate potential differences in life history traits affecting population viability.
Article
Marine & Freshwater Biology
Muddula Krishna Naranji, Govinda Rao Velamala, Kandula Sujatha
Summary: The study revealed that sawcheek scorpionfish females reach sexual maturity at a size of 108 mm TL, and their fecundity varies throughout the year, with an average of 5721.90 ova.
MARINE LIFE SCIENCE & TECHNOLOGY
(2021)
Article
Marine & Freshwater Biology
Fernando Rafael De Grande, Priscila Granado, Tania Marcia Costa
Summary: The decrease in mean body size caused by climate change is considered the third most important global impact on wildlife. This study investigated why fiddler crabs are smaller at their northern distribution limit due to thermal environment and survivorship differences among age-classes. The findings suggest that high temperatures lead to smaller body sizes and lower survival rates, with selective pressure against larger individuals.
ESTUARINE COASTAL AND SHELF SCIENCE
(2021)
Article
Agriculture, Dairy & Animal Science
Xchel Aurora Perez-Palafox, Enrique Morales-Bojorquez, Hugo Aguirre-Villasenor, Victor Hugo Cruz-Escalona
Summary: Understanding the sex ratio and size at maturity is crucial for biological reproduction and conservation goals. A study on the population of giant electric rays found that females were larger, with mature females present all year and continuous annual reproductive activity. The Gompertz model was the best fit for describing the length at maturity, which was determined to be 55.87 cm TL.
Article
Fisheries
Steven H. Wilcox, Tracy L. Pugh, Robert P. Glenn, Kenneth Oliveira
Summary: The study found that female channeled whelk matured to larger sizes in cooler waters, while male size at maturity showed a non-significant relationship with temperature. There were variations in size and age at maturity for channeled whelk between different areas in Massachusetts, indicating the need for tailored fishery management strategies.
FISHERIES RESEARCH
(2021)
Article
Marine & Freshwater Biology
Y. H. T. Dinh, N. H. Lam, F. V. Lishchenko
Summary: This article is the first attempt to describe the life-history traits and variability of Lutjanus malabaricus in Vietnamese waters. The study collected fish samples from June 2020 to May 2021 in Nghe An and Ha Tinh provinces. The study found that the fish had a wide range of standard length, weight, and age, with significant seasonal variations. The variation in stock structure was likely due to spawning migrations of large fish. Growth and weight gain were described using the von Bertalanffy function, and the growth constants were similar to the North-eastern Australian stock.
JOURNAL OF THE MARINE BIOLOGICAL ASSOCIATION OF THE UNITED KINGDOM
(2023)
Article
Ecology
Nadia Bouzzammit, Hammou El Habouz, Abdelbasset Ben-Bani, Hassan El Ouizgani
Summary: Scomber colias has become increasingly important commercially in the Atlantic waters of Morocco, but fishing efforts have negatively impacted its stock biomass. This study aimed to determine the spawning season and reproductive patterns of Scomber colias in the Atlantic coast of Morocco using macroscopic and microscopic approaches.
REGIONAL STUDIES IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Shubhadeep Ghosh, Mamidi Satishkumar, Hoshalli Munivenkatappa Manas, Prathibha Rohit, Eruppakkottil Median Abdussamad, Achamveetil Gopalakrishnan
Summary: This study provides detailed insights into the reproductive biology of Coryphaena hippurus in the Bay of Bengal, including information on sex ratio, size at sexual maturity, monthly spawning contribution, gonadosomatic index, and absolute fecundity. It is the first study of its kind in the region and contributes important knowledge to the management of this species in the Indian Ocean.
JOURNAL OF COASTAL RESEARCH
(2022)
Article
Biology
Quang M. Dinh, Ngon T. Truong, Nam S. Tran, Ton H. D. Nguyen
Summary: This study investigates the ovarian development, spawning patterns, maturity size, and fecundity of the goby Glossogobius giuris in the Vietnamese Mekong Delta. The study reveals that this goby is a multi-spawner and can spawn throughout the year, with spawning peaks regulated by salinity changes. The findings have implications for fish conservation strategies and artificial reproduction studies.
SAUDI JOURNAL OF BIOLOGICAL SCIENCES
(2022)
Article
Fisheries
Fan Zhang, Noel G. Cadigan
Summary: Estimating cohort dynamics from length-based data for hard-to-age stocks is challenging in fisheries stock assessment. The age-structured catch-at-length models (ACL) currently used are unable to account for length-dependent processes within each cohort. However, with the increasing availability of high-quality survey data, a new situation emerges where a stock assessment model based only on survey data can provide good estimation of population dynamics. We introduce an age- and length-structured statistical catch-at-length model (ALSCL) that can estimate age-based dynamics from survey catch-at-length data, while also providing a basis to integrate fisheries-dependent data. ALSCL includes length-dependent mortality and growth within each cohort by simultaneously tracking the three-dimensional dynamics across time, age, and length. Simulation results show that ALSCL outperforms ACL in estimating age-based population dynamics when length-dependent processes are important. ALSCL is considered a hybrid model between ACL and length-structured stock assessment models, and its ability to track age and length dynamics simultaneously is an important step towards the next-generation of fisheries stock assessment models.
FISH AND FISHERIES
(2022)
Article
Fisheries
Ashley E. Pacicco, Nancy J. Brown-Peterson, Debra J. Murie, Robert J. Allman, Derke Snodgrass, James S. Franks
Summary: The reproductive biology of yellowfin tuna in the northcentral U.S. Gulf of Mexico was investigated. The study found that peak spawning occurred from May to August, and caution should be exercised in using the physiological maturity threshold for estimating maturity length. Additionally, reproductive parameter estimates were provided for future stock assessments.
FISHERIES RESEARCH
(2023)
Article
Fisheries
Miguel Petrere Jr, Davi Butturi-Gomes
Summary: This short communication aims to raise awareness about the misuse of confidence intervals in Ecology and Fisheries statistical models that ignore the lack of independence.
FISHERIES RESEARCH
(2024)
Article
Fisheries
Peter-John F. Hulson, Benjamin C. Williams
Summary: This study evaluates the impact of considering ageing error and growth variability on the determination of input sample size (ISS) in statistical catch-at-age assessment models. The results show that including these sources of uncertainty decreases the ISS determined through bootstrap methods. This indicates that there is more variability in age composition and conditional age-at-length data than previously accounted for. Including these sources of uncertainty improves the estimation of ISS and subsequently improves the quality of stock assessment models.
FISHERIES RESEARCH
(2024)
Article
Fisheries
Jason M. Cope
Summary: Fishery resource assessment is a complex and challenging task, but with the use of different analysis methods and tools, effective management guidance can be provided even with limited data and resources.
FISHERIES RESEARCH
(2024)
Article
Fisheries
Regina L. Cunha, Joana I. Robalo, Sara M. Francisco, Ines Farias, Rita Castilho, Ivone Figueiredo
Summary: Recent advances in genomics have greatly contributed to the assessment of fish stocks by providing precise identification of genetic boundaries. This study used a genotyping-by-sequencing approach to reveal the existence of an additional genetic cluster of blackspot seabream in the northeast Atlantic, which was not previously identified. Factors such as ocean circulation patterns and local upwelling may play a role in the genetic differentiation observed in this study.
FISHERIES RESEARCH
(2024)
Article
Fisheries
Huihua Lee, Mark N. Maunder, Kevin R. Piner
Summary: Estimating growth is important for fish population assessment. Integrated assessment models and the influence of misfitting size composition data have renewed interest in how growth is modeled. The available data types control how the length-at-age relationship is estimated. Estimating length-at-age is complex due to multiple sources of biological variability and difficulties in obtaining representative samples.
FISHERIES RESEARCH
(2024)
Article
Fisheries
A. Ladino, I. Perez-Arjona, V. Espinosa, M. Chillaron, V. Vidal, L. M. Godinho, G. Moreno, G. Boyra
Summary: This study examines the acoustic properties of skipjack tuna and Atlantic mackerel, both bladderless pelagic fish species, and explains the significant differences observed. The research shows that the differences in material properties of their tissues predict a more than 10 dB greater reduced target strength in skipjack compared to mackerel at certain frequencies.
FISHERIES RESEARCH
(2024)
Article
Fisheries
Nelly Pena-Cutimbo, Cristel Cordero-Maldonado, Clara Ortiz-Alvarez, Joanna Alfaro-Shigueto, Jeffrey C. Mangel
Summary: Bycatch is a global problem for marine megafauna. This study assessed the bycatch interactions of the Peruvian artisanal purse-seine fishery in 2019 and found that all taxa groups were affected by bycatch. Dusky dolphins, guanay cormorants, and eagle rays were the most frequently reported bycatch species.
FISHERIES RESEARCH
(2024)
Article
Fisheries
Jen-Ming Liu, Po-Yuk So
Summary: The set-net fishery is an environmentally friendly fishery posing little risk to the marine ecosystem. This study identified ocean temperature, sea surface factors, and climatic factors as the main factors affecting the installation of set-nets.
FISHERIES RESEARCH
(2024)
Article
Fisheries
Josie L. Palmer, Carina Armstrong, Hasan D. Akbora, Damla Beton, Cigdem Caglar, Brendan J. Godley, Kristian Metcalfe, Meryem Ozkan, Robin T. E. Snape, Annette C. Broderick
Summary: Small-scale fisheries are vital for global food security and cultural heritage, but the lack of information hampers effective management and mitigation of ecological impacts. This study provides the first comprehensive overview of the small-scale fishery fleet in Northern Cyprus. The fleet operates mainly over the continental shelf, using static and demersal gear types, and catches a diverse range of species, some of which are threatened. The findings can be used to improve fisheries management and conservation measures.
FISHERIES RESEARCH
(2024)