Temperature and hunger mediate sablefish (Anoplopoma fimbria) feeding motivation: implications for stock assessment

2004 ◽  
Vol 61 (2) ◽  
pp. 238-246 ◽  
Author(s):  
Allan W Stoner ◽  
Erick A Sturm
Keyword(s):  
Water Temperature ◽  
Food Deprivation ◽  
Stock Assessment ◽  
Effective Area ◽  
Activity Level ◽  
Anoplopoma Fimbria ◽  
Feeding Motivation ◽  
Population Sizes ◽  
Increasing Temperature ◽  
Olfactory Cue

Laboratory experiments were conducted to test the hypothesis that temperature (2–8 °C) and recent feeding history (1–6 days of food deprivation) influence feeding motivation and attacks on baits by adult sablefish (Anoplo poma fimbria). Activity level after introduction of a bait-related olfactory cue increased with increasing water temperature and food deprivation. Fish at the lowest temperature (2 °C) attacked and consumed fewer squid baits (33–71%) than those at higher temperatures (100% at 8 °C). Baits were frequently inspected or handled multiple times before consumption in low temperatures, and time to attack (seconds to >40 min), time to consume, and time to handle baits (2–20 s) all decreased significantly with increasing temperature, with some temperature × feeding history interactions. The total ration consumed increased (<1–8% of body weight) with increasing water temperature. The observed variability in activity and feeding motivation in sablefish may have a large impact on the effective area of baited gear but is rarely considered in stock assessment models. In particular, population sizes based upon baited gear surveys may be underestimated in conditions where temperature is low, natural prey density is high, or where other environmental variables reduce feeding motivation.

scholarly journals Using decades of spawning data and hydraulic models to construct a temperature dependent resource selection function for management of an endangered salmonid

2021 ◽  
Author(s):  
Peter N Dudley ◽  
Sara N John ◽  
Miles E Daniels ◽  
Eric M. Danner
Keyword(s):  
Water Temperature ◽  
Environmental Variables ◽  
Resource Selection ◽  
Oncorhynchus Tshawytscha ◽  
Linear Models ◽  
Low Cost ◽  
Hydraulic Modeling ◽  
Selection Function ◽  
Spawning Habitat ◽  
Increasing Temperature

In North America, impassable, man-made barriers block access to salmonid spawning habitat and require costly restoration efforts in the remaining habitats. Evaluating restored spawning habitat quality requires information on salmon water velocity and depth preferences, which may vary in relation to other variables (e.g. water temperature). We demonstrate a generalizable, low cost method to gather and analyze this data by combining aerial redd surveys of winter-run Chinook salmon (Oncorhynchus tshawytscha), 2D hydraulic modeling, and generalized linear models to calculate spawning resource selection functions (RSFs). Our method permits the examination of interactions between environmental variables on habitat selection, which are frequently treated as independent. Our methods resulted in a RSF that shows interactions between both velocity and depth preference with changing temperature. Preferred depth increased and preferred velocity decreased with increasing temperature. Spawning RSFs for environmental variables may change as other environmental conditions (i.e. water temperature) change, thus it is importance to account for potential interactions when using or producing RSFs.

scholarly journals Reversibility of Multimodal Shift: Zebrafish Shift to Olfactory Cues When the Visual Environment Changes

2020 ◽  
Vol 60 (1) ◽  
pp. 33-42
Author(s):  
Piyumika S Suriyampola ◽  
Melissa Lopez ◽  
Brontë E Ellsworth ◽  
Emília P Martins
Keyword(s):  
Bright Light ◽  
Activity Level ◽  
Sensory Response ◽  
Opposite Pattern ◽  
Sensory Stimuli ◽  
Olfactory Responses ◽  
Lighting Conditions ◽  
Sensory Modalities ◽  
Complex Forms ◽  
Olfactory Cue

Synopsis Animals can shift their reliance on different sensory modalities in response to environmental conditions, and knowing the degree to which traits are reversible may help us to predict their chances of survival in a changing environment. Here, using adult zebrafish (Danio rerio), we found that 6 weeks in different light environments alone were sufficient to shift whether fish approached visual or chemical cues first, and that a subsequent reversal of lighting conditions also reversed their sensory preferences. In addition, we measured simple behavioral responses to sensory stimuli presented alone, and found that zebrafish housed in dim light for 6 weeks responded weakly to an optomotor assay, but strongly to an olfactory cue, whereas fish experiencing bright light for 6 weeks responded strongly to the visual optomotor stimulus and weakly in an olfactory assay. Visual and olfactory responses were equally reversible, and shifted to the opposite pattern when we reversed lighting conditions for 6 weeks. In contrast, we did not find a change in activity level, suggesting that changes in multiple sensory modalities can buffer animals from changes in more complex forms of behavior. This reversal of sensory response provides insight into how animals may use sensory shifts to keep up with environmental change.

Inhibition of ovarian development and instances of sex reversal in genotypic female sablefish (Anoplopoma fimbria) exposed to elevated water temperature

2019 ◽  
Vol 279 ◽  
pp. 88-98
Author(s):  
Thao B. Huynh ◽  
William T. Fairgrieve ◽  
Edward S. Hayman ◽  
Jonathan S.F. Lee ◽  
J. Adam Luckenbach
Keyword(s):  
Water Temperature ◽  
Ovarian Development ◽  
Sex Reversal ◽  
Anoplopoma Fimbria ◽  
Elevated Water

Hunger as a Catalyst in Aggression

Behaviour ◽  
1974 ◽  
Vol 48 (1-4) ◽  
pp. 123-129 ◽  
Author(s):  
Frederick H. Rohles ◽  
Linda M. Wilson
Keyword(s):  
Food Deprivation ◽  
Aggressive Behaviour ◽  
Inbred Mice ◽  
Thermal Conditions ◽  
Activity Level ◽  
Deprivation Group ◽  
Primary Determinant

AbstractUnder thermal conditions of 90° F 50% RH and a subject density of I subject per 0.125 sq. ft, two strains of inbred mice, C-57 (aggressive) and A/J (docile) were tested for aggressive behaviour following food deprivation periods of 0, 24, 36, and 48 hours. The greatest amount of aggression occurred in the 24 hours deprivation group of C-57 subjects whereas the 36 hour hungry A/J animals were most aggressive. Metabolism as evidenced by activity level and extent of food deprivation is suggested as the primary determinant of aggressive behaviour when temperature and subject-density are held constant.

scholarly journals The potential of video imagery from worldwide cabled observatory networks to provide information supporting fish-stock and biodiversity assessment

2020 ◽  
Author(s):  
J Aguzzi ◽  
D Chatzievangelou ◽  
J B Company ◽  
L Thomsen ◽  
S Marini ◽  
...  
Keyword(s):  
Stock Assessment ◽  
Spatial Dimension ◽  
Biological Data ◽  
Fish Stock ◽  
Monitoring Networks ◽  
Pilot Studies ◽  
Anoplopoma Fimbria ◽  
Video Imagery ◽  
Ne Pacific ◽  
Set Up

Abstract Seafloor multiparametric fibre-optic-cabled video observatories are emerging tools for standardized monitoring programmes, dedicated to the production of real-time fishery-independent stock assessment data. Here, we propose that a network of cabled cameras can be set up and optimized to ensure representative long-term monitoring of target commercial species and their surrounding habitats. We highlight the importance of adding the spatial dimension to fixed-point-cabled monitoring networks, and the need for close integration with Artificial Intelligence pipelines, that are necessary for fast and reliable biological data processing. We then describe two pilot studies, exemplary of using video imagery and environmental monitoring to derive robust data as a foundation for future ecosystem-based fish-stock and biodiversity management. The first example is from the NE Pacific Ocean where the deep-water sablefish (Anoplopoma fimbria) has been monitored since 2010 by the NEPTUNE cabled observatory operated by Ocean Networks Canada. The second example is from the NE Atlantic Ocean where the Norway lobster (Nephrops norvegicus) is being monitored using the SmartBay observatory developed for the European Multidisciplinary Seafloor and water column Observatories. Drawing from these two examples, we provide insights into the technological challenges and future steps required to develop full-scale fishery-independent stock assessments.

Grenadiers of the World Oceans: Biology, Stock Assessment, and Fisheries

2008 ◽  
Keyword(s):  
Bering Sea ◽  
Stock Assessment ◽  
Gulf Of Alaska ◽  
Pressure Change ◽  
Fishing Effort ◽  
Aleutian Islands ◽  
Anoplopoma Fimbria ◽  
Eastern Bering Sea ◽  
Mean Size ◽  
Longline Fisheries

<em>Abstract.</em>—This report summarizes biological, fishery, and survey information on giant grenadier, <em>Albatrossia pectoralis</em>, in Alaskan waters. Catch estimates of giant grenadier in Alaska for the years 1997–2005 have averaged over 16,000 metric tons (mt), and most of this catch has been taken as bycatch in longline fisheries for sablefish, <em>Anoplopoma fimbria</em>, and Greenland halibut, <em>Reinhardtius hippoglossoides</em>. The giant grenadier catch is all discarded, and none of the fish survive due to the pressure change when they are brought to the surface. Most of the catch is from the Gulf of Alaska. Data from bottom trawl and longline surveys in Alaska indicate that giant grenadier are extremely abundant in depths 300–1,000 m, and it appears this species is very important ecologically in this environment. Greatest abundance is in the western Gulf of Alaska, eastern Aleutian Islands, and in some areas of the eastern Bering Sea; abundance declines in the eastern Gulf of Alaska. Relative abundance of giant grenadier is much higher off Alaska than off the U.S. West Coast. Fish in the eastern Bering Sea and Aleutian Islands were consistently larger than those in the Gulf of Alaska. Mean size of females was larger in shallower water, and decreased with depth. Females and males appear to have different depth distributions, with females greatly predominating in depths less than 800 m. Although sex composition of giant grenadier caught in the fishery is unknown, nearly all the fishing effort is believed to be in waters less than 800 m, which indicates females are disproportionately harvested. Because of the great abundance of giant grenadier in Alaska and the relatively modest catch, overfishing of giant grenadier does not appear to be a problem at present. However, because information on the population dynamics of giant grenadier is very sparse, and because of the 100% discard mortality, the disproportionate harvest of females, and the general susceptibility of deep-sea fish to overharvest, fishery managers should monitor this species closely if catches increase in the future.

Aspects of the population dynamics of the western rock lobster, Panulirus cygnus George. II. Seasonal changes in the catchability coefficient

1974 ◽  
Vol 25 (2) ◽  
pp. 249 ◽  
Author(s):  
GR Morgan
Keyword(s):  
Population Dynamics ◽  
Population Density ◽  
Water Temperature ◽  
Linear Combination ◽  
Seasonal Changes ◽  
Stock Assessment ◽  
Water Salinity ◽  
Rock Lobster ◽  
Highly Correlated ◽  
Panulirus Cygnus

The catchability coefficient, q, of a population of the western rock lobster P. cygnus was calculated monthly from November 1969 to January 1973 using measurements of catch, effort, population density, and area of reef. The catchability coefficient varied significantly during this time and was positively correlated with water temperature and water salinity, and negatively correlated with the percentage of rock lobsters in a premoult condition. A linear combination of these three factors was highly correlated with the catchability coefficient (P < 0.001) and appears to offer a method of adjusting the catchability coefficient and so leading to an improved stock assessment for this species.

Laboratory evidence for behavioural impairment of fish escaping trawls: a review

2004 ◽  
Vol 61 (7) ◽  
pp. 1157-1164 ◽  
Author(s):  
Clifford H. Ryer
Keyword(s):  
Gadus Morhua ◽  
Stock Assessment ◽  
Direct Result ◽  
Control Fish ◽  
Extensive Literature ◽  
Anoplopoma Fimbria ◽  
The Hours ◽  
By Catch ◽  
Trawl Fisheries ◽  
Behavioural Deficits

Abstract It is now widely accepted that for some species a proportion of the undersized fish escaping trawl codends die as a direct result of stress, with 10% to 30% mortality commonly cited. It has also been suggested that there may be indirect or behaviourally mediated mortality; fish that encounter and escape the trawl, only to experience stress-induced behavioural deficits and succumb to predators in the hours or days afterwards. The goal of this review was to evaluate the plausibility of this behaviourally mediated, yet unobserved mortality. Three laboratory studies utilizing cod (Gadus morhua), walleye pollock (Theragra chalcogramma), and sablefish (Anoplopoma fimbria) have assayed for behavioural impairment in fish following application of stressors designed to simulate entrainment and escape from trawls. Where impairments in anti-predator capabilities occurred, it was determined that trawl-stressed fish exhibited reduced swimming speed, reduced shoal cohesion, and reduced predator vigilance compared to control fish. Although stressed fish appeared to rapidly recover their ability to avoid being eaten by predators, measurements of more subtle aspects of escapee behaviour suggest that impairments may persist for days after stressor application. Although these studies demonstrate that more investigation is required, when combined with a more extensive literature demonstrating that a variety of stressors can impair fish anti-predator behaviour, it is reasonable to conclude that many fish species escaping trawl codends will likely suffer behavioural deficits that subject them to elevated predation risk. As such, there is probably mortality associated with trawl fisheries that is generally unrecognized, unmeasured, and unaccounted for in current stock assessment models. Further, these studies demonstrate that behavioural competency needs to be considered in the design and implementation of by-catch reduction devises and strategies.

scholarly journals Seasonal variation in energy expenditure is not related to activity level or water temperature in a large diving bird

2012 ◽  
Vol 215 (18) ◽  
pp. 3161-3168 ◽  
Author(s):  
M. Guillemette ◽  
P. J. Butler
Keyword(s):  
Seasonal Variation ◽  
Energy Expenditure ◽  
Water Temperature ◽  
Activity Level ◽  
Diving Bird

A Sigmoid Model to Predict Gastric Evacuation Rates of Smallmouth Bass (Micropterus dolomieui) Fed Juvenile Salmon

1991 ◽  
Vol 48 (5) ◽  
pp. 933-937 ◽  
Author(s):  
Jean Beyer Rogers ◽  
Craig C. Burley
Keyword(s):  
Water Temperature ◽  
Laboratory Experiments ◽  
Prey Size ◽  
Stomach Contents ◽  
Smallmouth Bass ◽  
Juvenile Salmon ◽  
Gastric Evacuation ◽  
Predator Size ◽  
Micropterus Dolomieui ◽  
Increasing Temperature

Laboratory experiments were conducted to examine the effects of water temperature, predator size, prey size, and prey number on gastric evacuation of smallmouth bass (Micropterus dolomieui) fed juvenile salmon. The smallmouth bass were allowed to feed voluntarily after 24–48 h of starvation and stomachs were pumped at intervals of 1–4 h until 90% of the stomach contents were evacuated (E90). Evacuation approximated an S-shaped curve over time, and a sigmoid model was developed to predict evacuation at varying water temperatures, total meal weights, predator sizes, and prey number. The rate of evacuation increased with increasing water temperature, meal weight, or predator size. The E90 increased with larger meal weights but decreased with increasing temperature or predator size. E90 ranged between 4 and 95 h, depending upon conditions. E90 was slower than those estimated previously for another predator of salmon, the stomachless northern squawfish (Ptychocheilus oregonensis).

Sign in / Sign up

Export Citation Format

Share Document