Many deep-sea trawl fisheries show a serial pattern of “boom and bust,” as we show in later sections. Deep-sea fishes show remarkable adaptations to life in a cold, dark, low-productivity Enzalutamide price environment [37]. Depth and temperature directly affect fish growth rates, which tie to a range of life history characteristics that affect the maximum intrinsic population growth rate (rmax) [38] and [39], including delayed maturity, high maximum age and low average productivity [24], [40], [41], [42], [43] and [44]. Low fish stock productivity, in turn, affects the capacity of those species to respond to fishing pressure and tightly restricts the maximum

catch that a population can tolerate [45]. Delayed maturity and low or episodic recruitment are common traits in many overexploited fish stocks worldwide [46], [47] and [48]. Due to cold temperatures and high variance in food resources, most deep-sea fishes grow slowly, although species vary in allocation of their reproductive investment (large or small eggs, GSK1210151A mw reproducing often or rarely), likely in response to the environmental variance experienced by their offspring. Many deep-sea species have larger eggs and hence lower fecundity than other teleosts of similar size [49]. Greater yolk reserves for the developing larva may be an adaptation to food

limitation. Although some deep-sea fishes are highly fecund, they seem to have characteristics of “periodic strategists” [41], namely long lifespans to accommodate Progesterone extremely variable early survival. This strategy is often accompanied by high variance in recruitment success and spawning frequencies less than once per year [50] and [51], leading to resilience too low to compensate for high adult mortality. At first it might

seem that high fecundity leads to greater average population resilience, but empirical evaluation of many taxa indicate that more fecund fishes do not show higher recruitment or faster recovery rates than species with fewer offspring per year [45], [46], [52] and [53]. Life table analysis of two highly fecund North Atlantic grenadier species suggests very slow response to exploitation and potential for multi-decadal recovery times [29]. Two overfished stocks of very long-lived North Pacific rockfishes (genus Sebastes, Sebastidae) are currently on recovery plans that span several decades, in spite of fecundity estimates in the hundreds of thousands of larvae per female [54]. Are deep-sea fishes less resilient, on average, than those in shallow marine ecosystems? Resilience (and its opposite, intrinsic vulnerability) reflects the capacity of a species or population to tolerate impacts without irreversible change in its population structure [55] and [56], which are tightly linked to its life history.