Maria Stein

• BSc
• Research Assistant at Inter-American Tropical Tuna Commission

Prey selectivity, diel feeding patterns, and effects of light intensity on prey consumption, growth and survival of laboratory-reared yellowfin tuna (YFT) Thunnus albacares larvae were studied at the Inter-American Tropical Tuna Commission’s, Achotines Laboratory in the Republic of Panama. Prey selectivity analysis (Pearre’s c index) for first-feed...

Increasing ocean acidification is a concern due to its potential effects on the growth, development, and survival of early life stages of tuna in oceanic habitats and on the spatial extent of their suitable nursery habitat. To investigate the potential effects of increasing CO 2 on otolith calcification of 9-day old pre-flexion stage yellowfin tuna...

Changes in nutritional constituents and enzyme activities were clarified in yellowfin tuna (YFT, Thunnus albacares) eggs during embryonic development, from eggs immediately after fertilization to hatching. The protein levels in the eggs gradually increased with development until the completion of hatching. In contrast, the triglyceride (TG) and fre...

RNA, DNA, and protein contents were assessed to evaluate somatic growth in larval and juvenile yellowfin tuna (YFT), Thunnus albacares. The experimental fish were reared at the Achotines Laboratory of the Inter-American Tropical Tuna Commission in Los Santos Province, Republic of Panama. Sampling was carried out from 3 to 33 days after hatching (DA...

Three experiments were conducted to investigate the growth, survival, and standardized cohort biomass of Pacific bluefin tuna, Thunnus orientalis, larvae fed nutritionally enhanced prey during the first week of feeding using two commonly used, commercially available enrichment media, AlgaMac Enrich and Marine Glos. T. orientalis larvae exhibited ex...

Comparative feeding studies of yellowfin (Thunnus albacares) (YFT) and Pacific bluefin (Thunnus orientalis) (PBT) tuna larvae were conducted between 2011 and 2014 at the Inter-American Tropical Tuna Commission’s Achotines Laboratory in Panama and the Kinki University Fishery Laboratory in Japan as part of a 5-year research project of the SATREPS Pr...

The yellowfin tuna (Thunnus albacares) (YFT) exhibits strong potential as a candidate species for full-life-cycle aquaculture. The Inter-American Tropical Tuna Commission (IATTC) has maintained a spawning population and studied the reproductive biology and early life history of YFT for research purposes at its Achotines Laboratory, Republic of Pana...

Early-stage mortality due to surface water tension-related death and due to sinking to the tank bottom was investigated for yellowfin tuna, Thunnus albacares (YFT), larvae. Different aeration rates and rearing water surface conditions were examined to evaluate the effect on larval survival, swim bladder inflation and growth. The percentage survival...

Anthropogenic carbon dioxide (CO2) emissions are resulting in increasing absorption of CO2 by the earth‘s oceans, which has led to a decline in ocean pH, a process known as ocean acidification (OA). Evidence suggests that OA may have the potential to affect the distribution and population dynamics of many marine organisms. Early life history proces...

Effect of water temperature on embryonic development of yellor,vfin tuna was investigated. Eggs were incubated at different water temperatures:22, 24, 26C (Experiment-1) arrd 28, 30, 32C (Experiment-2). Developmental condition was observed and the elapsed time from the 2 or 4 cell stages until hatching was mea-sured. Hatching occurred at 18.58 h fo...

Achotines Laboratory, owned and operated by the Inter-American Tropical Tuna Commission (IATTC), is the only research facility in the world with captive broodstock tuna that have been spawning on a near daily basis for over a decade. Yellowfin tuna eggs, larvae and juveniles resulting from those spawns are used for a variety of studies including in...