Armagan Sabetian

Auckland University of Technology | AUT · School of Applied Science

Human activities have significantly altered coastal ecosystems worldwide. The phenomenon of shifting baselines syndrome (SBS) complicates our understanding of these changes, masking the true scale of human impacts. This study investigates the long-term ecological effects of anthropogenic activities on New Zealand's coastal ecosystems over 800 years...

Broodstock management has traditionally focused on heritabletraits and diet-induced gamete quality. However, the potential of transgenerational plasticity (TP) underscores the importance of understanding adaptive trait transfer in aquaculture, where the sustainability of production can be hampered by mortality arising from disease and stress. Notab...

Unveiling the intricate relationships between animal movement ecology, feeding behavior, and internal energy budgeting is crucial for a comprehensive understanding of ecosystem functioning, especially on coral reefs under significant anthropo-genic stress. Here, herbivorous fishes play a vital role as mediators between algae growth and coral recrui...

In-depth understanding of animal movement ecology, including energy expenditure and internal energy budgeting, is crucial for deciphering the intricate dynamics of ecosystem functioning. It essentially reveals resource partitioning and energy flows among foraging organisms within their habitats. Ecosystems under severe anthropogenic stress, such as...

Unveiling the intricate relationships between animal movement ecology, feeding behaviour, and internal energy budgeting is essential for a comprehensive understanding of ecosystem functioning. Particularly in degraded habitats like coral reefs, which are under significant anthropogenic stress, these interactions are crucial yet largely unexplored....

As fish move between environments of different concentrations of chemical tracers at various stages during their life, their otoliths record a continuous dataset in a two-dimensional space coordinated by various trace elements. Such a continuous dataset is equivalent to a time-series and characterised by changes in the gradients of incorporated che...

Anthropogenic factors have been identified as major stressors of nearshore environments such as estuaries, sea grass meadows and mangroves. We hypothesize that aquatic organisms functionally dependent on these habitats as nurseries respond to disturbances with subtle changes in their habitat-use patterns. We used a novel approach coupling behaviour...

Tāmure (Australasian snapper, Chrysophrys auratus) is the most commonly identified fish in pre-European Māori middens in northern New Zealand. Tāmure reproduce in open water, after which their larvae migrate to nurseries in sheltered inshore environments. The range of suitable nursery habitats in the Hauraki Gulf has declined over the last century...

Behaviours of Clark's anemonefish Amphiprion clarkii and the dusky anemonefish Amphiprion melanopus were studied in Vanuatu. Six anemones and their resident fish were observed for typical behaviours (hiding, watching, roaming, inter‐, and intraspecific behaviour) with and without the presence of a snorkelling observer. Observer presence had signifi...

The ability of different broodstock generations to provision lipids to their gametes is often overlooked in aquacultured freshwater fish. In this study we investigated the ability of two generations (F1 & F2) of Giant Kokopu (Galaxias argenteus) to provision fatty acids into their eggs. Here we show that eggs of captive-bred females (F2) displayed...

Survival, growth rates and functionality of larvae have been hypothesised to correlate with higher lipid provisioning in older teleosts. To test the lipid provisioning part of this hypothesis, we investigated the total and relative (mg/g) lipid (triglyceride) concentration in both the source (liver) and sink (gonad) lipidation organs of female snap...

We employed flow cytometry to assess plasma membrane viability of sperm cells in farmed giant kokopu Galaxias argenteus, an endemic amphidromous New Zealand fish. Specifically, the variables of fish size (TL mm) and weight (grams) were assessed against sperm viability. We found no significant difference (P < .05) in sperm viability when compared ac...

References Age, size, growth and sex ratio of the Blue-barred parrotfish Scarus ghobban were investigated from Taiwan and Solomon Islands. While both populations exhibited similar rapid early growth, the longevity, maximum size and asymptotic length of S. ghobban in Taiwan were significantly higher than in the Solomon Islands. Gender analysis showe...

Size and age structure, longevity, growth, and reproductive activity of European perch (Perca fluviatilis) were studied at Lake Wainamu in March 2012 and 2013 as part of an introduced species eradication programme. Size and age structure of P. fluviatilis were dominated by smaller and younger individuals, while maximum age was estimated at 6 and 5...

It is generally believed that size grading in a fish farm improves the total biomass output, because it will minimise the stress imposed by larger individuals over small individuals, resulting in higher feed intake and growth rate. The objective of this study was to evaluate the effect of size grading on individual growth performance of yellow New...

Increasing migration into urbanized centers in the Solomon Islands poses a great threat to adjacent coral reef fisheries because of negative effects on the fisheries and because it further erodes customary management systems. Parrotfish fisheries are of particular importance because the feeding habits of parrotfish (scrape and excavate coral) are t...

Marine conservation programs in Oceania are increasingly turning to precautionary and adaptive management, particularly approaches which emphasize local participation and customary management. Although the application of community-based natural resource management is widespread in the region, the full integration of local knowledge and practices in...

In this article we describe the rapid uptake of technology that increases fishing efficiency in two parts of western Melanesia: Ghizo Island in Western Province, Solomon Islands, and Milne Bay Province in Papua New Guinea. We present evidence that demonstrates a disturbing lack of awareness among fishers of the finite nature of the stocks they are...

I collected baseline abundance data on groupers from the reefs of Vavanga village on Kolombangara Island, Solomon Islands. Physical and environmental factors significantly affected the abundance and distribution patterns of groupers. Size and age distribution of groupers varied with depth. Power analysis on the abundance data showed that although p...