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Age and growth of Pagellus bogaraveo (Brünnich, 1768) from the exploration of different habitats in the central Mediterranean Sea

Our take

Understanding the age and growth dynamics of *Pagellus bogaraveo* (blackspot seabream) is crucial for effective fisheries management in the central Mediterranean Sea. This study, utilizing otolith reading, back calculation, and Modal Progression Analysis on specimens from both flat muddy bottoms and cold-water coral habitats, provides robust age estimates. Results indicate a maximum age of nine years and consistent growth patterns across methodologies, suggesting slow growth rates comparable to other Mediterranean populations.
Age and growth of Pagellus bogaraveo (Brünnich, 1768) from the exploration of different habitats in the central Mediterranean Sea

The recent study detailing the age and growth of *Pagellus bogaraveo* (blackspot seabream) in the central Mediterranean Sea provides a valuable contribution to our understanding of fish population dynamics and highlights the critical role of robust data in sustainable fisheries management. Accurate age determination is foundational to effective stock assessments, and this research, employing a rigorous comparison of three methodologies—otolith reading, back calculation, and Modal Progression Analysis—demonstrates a commendable commitment to data validation. The consistent results obtained across these methods underscore the reliability of the findings and strengthen their utility for informing management decisions. This aligns with the broader conversation around data literacy in marine science, as explored in “No data literacy, no ocean protection? A perspective on lowering barriers to data literacy in marine environmental sciences,” emphasizing the need for accessible and validated data to drive informed action. Furthermore, the study's investigation across two distinct habitats – flat muddy bottoms and cold-water coral and canyon habitats – adds nuance to our understanding of how environmental factors influence growth patterns, a complexity particularly relevant in regions undergoing rapid environmental change. The importance of integrating diverse data sources, as exemplified here, is also mirrored in “Marine spatial planning in the Pacific Islands - a transformative approach to ocean governance?” where effective management relies on comprehensive, spatially-resolved information.

The observed slow growth rate of *P. bogaraveo*, consistent with previous observations in the Mediterranean, reinforces the vulnerability of this species to fishing pressure, particularly given the often-insufficient data currently available for stock assessments in the region. The empirical approach taken by the researchers, utilizing longitudinal data and calibrated methodologies, is a model for future studies aiming to improve the accuracy of age estimation. The study’s findings emphasize the importance of incorporating habitat-specific data into population models, recognizing that growth rates and life histories can vary significantly depending on environmental conditions. The consistency in growth curves across the different methods used is particularly noteworthy; it provides a high degree of confidence in the derived parameters, such as L∞ (carrying capacity) and k (growth coefficient), which are crucial inputs for stock assessment models. This reinforces the need for continued investment in validated methodologies and integrated data ecosystems, as we strive to build ocean intelligence that supports informed decision-making.

The absence of sufficient data for stock assessments in this region underscores a broader challenge facing fisheries management globally. The insights gleaned from this study, while focused on a single species, have implications for the management of other Mediterranean fish stocks and highlight the urgent need for enhanced monitoring programs and data collection efforts. The researchers’ meticulous approach, combining direct and indirect age estimation techniques, provides a valuable framework for future studies aiming to improve the accuracy and reliability of age data. Considering the increasing pressures on marine ecosystems from climate change and human activities, the ability to accurately assess fish populations and predict their responses to environmental changes is paramount. The details presented in “Substantiation of solutions for enhancing the environmental safety level of a marine oil terminal under conditions of high intensification of technological processes” also speak to the increasing need for careful measurement and assessment of environmental impact in a region experiencing increasing anthropogenic activity.

Looking ahead, a key question arises: how can we effectively translate these validated growth parameters into practical, adaptive fisheries management strategies? The integration of this data into ecosystem-based models, coupled with real-time monitoring of environmental conditions, holds promise for developing more resilient and sustainable fisheries. The challenge lies in bridging the gap between scientific findings and policy implementation, ensuring that data-driven insights inform management decisions that safeguard both marine biodiversity and the livelihoods of communities that depend on these resources. Continued collaboration between researchers, policymakers, and fishing communities will be essential to achieving this goal and fostering a future where ocean stewardship is driven by empirical evidence and a shared sense of responsibility.

This study investigates the age and growth of the blackspot seabream in the north-western Ionian Sea (Central Mediterranean). An accurate study on determining age is necessary to provide useful information for understanding population dynamics and to perform stock assessments which are essential for the scientific and prudent management of fisheries. Using data sets from two habitats (flat muddy bottoms and heterogeneous cold-water coral and canyon habitats) and comparing three different methodologies: one direct (otolith reading) and two indirect methods (back calculation and Modal Progression Analysis), was possible to obtain a more robust age estimate. A total of 1023 specimens of blackspot seabream were collected from muddy bottoms at depths of 13-695 m, and 60 individuals were caught in the cold-water coral and canyon habitats between 183 and 612 m depth. The length-frequency distributions of P. bogaraveo showed a polymodal pattern in both habitats explored, with small to medium-sized individuals caught on flat muddy bottoms and larger ones in cold-water coral and canyon habitats. The maximum age estimated by reading otoliths was 9 years for an individual of 347 mm TL and no significant difference was observed comparing the three age-length keys. Consequently, the three methods provided consistent results confirming the same growth pattern. The growth curves were comparable among methods, with no significant difference observed: otolith readings: L∞ 459 mm, k=0.12 year-1, t0=-1.68 years; back calculation method L∞ 412 mm, k=0.14 year-1, t0=-1.20 years; MPA L∞ 339 mm, k=0.20 years-1, t0=-1.20 years. These results suggest slow growth in accordance with what has already been observed in other areas of the Mediterranean Sea. These insights provide key elements to support the development of more effective and sustainable fisheries management strategies, especially in this case for which data for stock assessments are insufficient or absent.

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