Research Article

Quality of Rainbow Trout (Oncorhynchus mykiss) Reared in Recirculating Aquaculture System and during Depuration Based on Chemical and Sensory Analysis

Table 2

Selected sensory attributes (12 odor, 5 taste, and 12 flavor properties).

Sensory attributeDescriptionReference sample (intensity)

Total intensity of odorThe total intensity of all odor properties

Grass-like odorOdor of grass, moss, and fresh greenCis-3-hexen-1-oli (only during training to identify the odor)

Sea-like odorOdor of salt water, reeds, and wet greenSecond cooking: water of 10 g Kombu (WISSI Atlantic vegetables) boiled twice in 1 L of clean: water for 30 min (4)

Fish-like odorOdor of fish and fatty fishFish oil (Ecolomega natural) (6)

Fatty odorOdor of oil, fatty fish, and fish oilFish oil (Ecolomega natural) (5)

Seaweed-like odorOdor of algae and especially seaweedCooking: water of 10 g Kombu (WISSI Atlantic vegetables) boiled once in 1 L of water for 30 min (5)

Mud-like odorThe odor when one steps onto a bed of reeds on the shore, and especially the odor that arises from an oxygen-free condition. Can also be a mud-like odor, an odor of clay from city road construction works, or an odor of rotten egg, damp grass, or fodder compost

Earthy odorThe odor of an underground cellar. The odor of cellar or soil is related to an earthy and/or musty odor

Moldy odorThe odor associated with mold

Musty odorAll non-fresh odors (e.g., mud-like, earthy, moldy, and other odors)

Rancid odorThe odor of rancid and oxidized fat/oilButyric acid (during training to identify the odor in the sample)

Metallic odorThe odor of iron and metal

Total intensity of tasteThe total intensity of all taste and flavor properties

SweetnessThe taste of sweetness0.3% (w/v) sucrose (5)

SaltinessThe taste of saltiness0.2% (w/v) NaCl (8)

UmamiThe taste of umami0.1% (w/v) sodium glutamate (7)

SournessThe taste of sourness0.03% (w/v) citric acid (8)

BitternessThe taste of bitterness0.03% (w/v) caffeine (7)

Fish-like flavorThe flavor of fish and fatty fishFish oil (Ecolomega natural) (7)

Fatty flavorThe flavor of oil, fatty fish, and fish oilFish oil (Ecolomega natural) (5)

Sea-like flavorThe flavor of salt water, reeds, and wet greenSecond cooking water of 10 g Kombu (WISSI Atlantic vegetables) boiled twice in 1 L of fresh water for 30 min (5)

Seaweed-like flavorThe flavor of algae and seaweedCooking water of 10 g Kombu (WISSI Atlantic vegetables) boiled once in 1 L of water for 30 min (8)
Second cooking water of 10 g Kombu (WISSI Atlantic vegetables) boiled twice in 1 L of fresh water for 30 min (5)

Mud-like flavorThe flavor when one steps onto a bed of reeds on the shore, and especially the odor that arises from an oxygen-free condition. Can also be a mud-like odor, an odor of clay from city road construction works, or an odor of rotten egg, damp grass, or fodder compost

Earthy flavorThe flavor of an underground cellar. The flavor of cellar or soil is related to an earthy and/or musty flavor

Moldy flavorThe flavor associated with mold

Musty flavorAll non-fresh flavors (e.g., mud-like, earthy, moldy, and other flavors)

Rancid flavorThe flavor of rancid and oxidized fat/oilButyric acid (by smelling, during training to identify the flavor of the sample)

Metallic flavorThe flavor of iron and metal

Total intensity of aftertasteThe taste and flavor that stays in the mouth after swallowing

Descriptions, and reference samples were used for the sensory evaluation. The intensities of reference samples on a scale of 0–10 are in parentheses.