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Visual Feeding by Juvenile Bear Lake Sculpin

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Visual Feeding by Juvenile Bear Lake Sculpin NOTES 395 · oflhe American Fisheries Society 121:395-398. 1992 Trtl nsaclWgh"": by the American Fisheries Society 1992 C Copyn Visual Feeding by Juvenile Bear Lake Sculpin D ARCY NEVERMAN 1 AND mocline at night, where they remain without feed­ WAYNE A. WURTSBAUGH ing until daybreak. After returning to the bottom Utah State University at dawn, they feed throughout the day on benthic Department of Fisheries and Wildlife invertebrates, mainly cyclopoid copepods and os­ Ecology Center tracods (Neverman 1989). Migration into the Logan. Utah 8322-5210. USA warmer water of the thermocline promotes diges­ tion and growth (Wurtsbaugh and Neverman Abstract. - Young-of-the-year Bear Lake sculpin Cot­ 1988). tus extensus feed throughout the day on benthic inver­ tebrates and cease feeding at night when they migrate to the metalimnion. We investigated their reliance on vi­ Methods sion by conducti ng feeding trials at different light levels We conducted feeding trials at different light in the laboratory. Feeding rate reached a maximum at 16 intensities in a black, 40-L aquarium. Individual intermediate light levels (near 10 photons·m-2 ·s- l ; ap­ proximately I lux) but decreased as light intensity in­ fish were placed in uncovered 250-mL beakers creased beyond this range. At this maximum rate, the inside this chamber. Water surrounding the beak­ fish fed ni ne ti mes faster than they were able to feed in ers was kept at 10-11.5°C. Light intensity in the the dark, showi ng that young Bear Lake sculpin r~ ly chamber was varied by screening a 40-W cool heavily upon vision to feed. The light intensity at which white fluorescent bulb with 2-46 layers of window feeding was greatest corresponded to intensities found screen (Blaxter 1968, 1969; Dabrowski and Jew­ on the bottom of Bear Lake (40-60 m) during the day. son 1984). The bulb was suspended 200 rom above the surface of the water and extended the length Feeding and other behaviors differ greatly be­ of the aquarium. Light intensities were measured tween the adults and juveniles of some fish species with a 400-700-nm, 2-pi sensor and a LiCor 188B (Blaxter 1969; Emery 1973). Adult mottled scul­ radiometer. We could not measure light at inten­ pin Cottus bairdi can feed using mechanorecep­ sities below 6.0 x IOI Sphotos·m- 2 ·s- 1 (18 screens), tion or proprioception (Hoekstra and Janssen but we estimated them by extrapolating the linear 1985); larvae of this species can also feed by non­ relationship (r 2 = 0.999) between screen number visual means (Jones and Janssen, in press). Young (5) and light intensity (/): 10glO! = 19.56 - 0.212 S. fish of many marine and freshwater fish species, Feeding trials were conducted with fish that had however, are believed to feed visually (Blaxter been captured by nighttime trawling in the ther­ 1966, 1974; Dabrowski 1982; Dabrowski and mocline over the 30-50-m depth contour. These Jewson 1984). Our study was undertaken to de­ fish (mean total length, 20.7 mm; SD, 2.8 mm) termine if young-of-the-year (age-O) Bear Lake were acclimated to laboratory conditions for at sculpin Cottus extensus rely on vision to feed and, least 15 d and fed live zooplankton. We began if so, the light levels necessary for visual feeding experimental acclimatization by placing individ­ to occur. ual fish in 100 mL of filtered lake water in a 250- Bear Lake SCUlpin are endemic to Bear Lake on mL beaker and holding them in the dark for 12 h the Utah-Idaho border (42°N, Illo20'W). The lake at 6°C. We then held them an additional 2 h under 2 covers 282 km and is a dimictic, oligotrophic, experimental conditions oflight and temperature. tilt-block system. Marl substrates dominate the We began each experiment by adding 30 live, prOfunda! region of the lake, where age-O Bear late-instar copepods Epischura nevadens.is to each Lake SCUlpi n undergo diel vertical migrations. Ju­ of seven beakers while the light was briefly turned venile Bear Lake sculpin in this region swim from off. One control beaker without fish was used to the bottom (60 m maximum depth) to the ther- estimate nonpredatory losses of the prey. Losses in the control beakers were negligible and were - therefore disregarded in the calculation of preda­ 1 Present address: Missouri Department of Conser­ vation, 2500 South Halliburton, Kirksville, Missouri tion rates. After prey were introduced, the light 63501 , USA. was turned on for a 20-min feeding period. We 396 NOTES stopped the experiment by turning out the lights Results and immediately removing the fish with the aid Light intensity had a pronounced effect on feed. of a low-intensity red light. We then killed and ing rates of age-O Bear Lake sculpin (Figure I). counted the remaining prey and determined the The fish could feed in complete darkness, but at number eaten by difference. Instantaneous feeding low rates. Feeding rates increased significantly (F. rate coefficients (k) were calculated as test; df = 3, 6; P < 0.0 I; Wilkinson 1988) as light k = - log.,(PflP i) . intensities rose to approximately 6 x lOI S pho­ 2 l 11 X ·t ' tons·m- ·s- • At intensities above 10 photons. m- 2 ·s- 1 feeding rates decreased significantly (df= Pf = final number of prey in a beaker, Pi = initial 3, 2; P < 0.005) with increasing light. The vari. number of prey (30), t = 0.33 h, and X= number ability in feeding rates was much greater at ele. of predators (10) per liter (Dodson 1975). This vated light intensities than at lower levels (Figure coefficient indicates the number of liters cleared I). of prey by a single fish in I h. For the 7 d they were calculated, vertical light In all, 236 fish were tested at 15 light intensities extinction coefficients in Bear Lake were 0.22, 0.19, ranging from complete darkness to the full inten­ 0.22, 0.24, 0.22, 0.28 and 0.26 · m- I. Using these sity of the 40-W bulb diffused through two screens data we estimate that at depths of 40-60 m in the (3 .5 x 10 19 photons·m- 2 ·s- I). For comparison, lake, where Bear Lake sculpin resided, daytime full sunlight intensities measured with the 2-pi light intensities varied from 10 14 to 10 18 photons· 2 1 2 l sensor are near I x 10 photons·m- ·s- • Except m- 2 . S- I (Figure I). At night, light intensities at this for a single trial in August, experiments were con­ depth varied from 108 to 10" photons·m- 2·s-1 ducted over a 3-week period in September and depending primarily on moon phase. October 1985. During the first week we tested feeding at light intensities ranging from 10 17 to Discussion 10 19 photons·m- 2 ·s- 1 and in complete darkness. The rapid increase in their feeding rates with These trials were not randomized. When it be­ increases in light intensity up to intermediate lev· came obvious that intermediate intensities would els shows that age-O Bear Lake sculpin feed vi, be necessary to describe the relationship between sually. Feeding rates of the fish increased rapidly light and feeding, we randomly tested intensities in the range of light intensities found to be a com· between complete darkness and 10 19 photons·m- 2 • mon optima for many fishes (10 14_10 16 photons· S- I. Analysis of covariance (ANCOVA) indicated m-2 ·s- l ; 0.01-1 lux; Blaxter 1980). Although young no relationship between date of an experiment and Bear Lake sculpin fed in complete darkness, feed­ feeding rates or between date and deviations from ing rates without light were only 10% of those at regressions of light and feeding rate, but it did intermediate light intensities. We expect thatadult indicate that fish length had a small but significant Bear Lake sculpin also feed visually, because we (P < 0.05) influence on feeding rates. We therefore have observed them under room lighting attempt­ used ANCOVA to correct the feeding rate coeffi­ ing to attack juvenile fish behind a wall of glass. cients to the mean size of Bear Lake sculpin used This visual or diurnal feeding by both young and in the experiments. adult Bear Lake sculpin contrasts ' with the re­ To compare laboratory light intensities with ported nonvisual or proprioceptive feeding by those in the lake we determined a summer range adult mottled sculpin and slimy sculpin C. cog­ of light extinction coefficients for Bear Lake. On natus (Hoekstra and Janssen 1985; Kraft and seven dates (I July, 18 July, 30 July, 14 August, Kitchell 1986) and that of nocturnal feeding by 27 August, 16 September, and 25 October) in 1985 prickly sculpin C. asper and slimy sculpin (Broad­ we measured intensities of photosynthetic active way and Moyle 1978; Brandt 1986). radiation (400-700 nm) near midday at depths We do not fully understand why young Bear from 0 to 22 m with the LiCor radiometer. The Lake SCUlpin fed maximally at intermediate light vertical light extinction coefficients determined intensities. We acknowledge that, due to differ­ from these profiles were used to extrapolate inten­ ences in spectral quality between laboratory and sities to the lake bottom under full sunlight and lake and difficulties in obtaining natural backlight­ night sky conditions. The spectral composition and ing in the laboratory, it is difficult to accurately irradiance of full moon and starlight (Munz and extrapolate our laboratory feeding rates to lake McFarland 1977) were used to estimate light in­ conditions (Janssen 1981).
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