Government and environmental organizations alike have accepted the idea of fishing down the food web as

doctrine and are attempting to customize fisheries management policies accordingly [3]. Recent studies, however, have indicated that not all worldwide fisheries may be moving down the food web. Instead, studies have suggested that the witnessed changes in food web dynamics may be due to alternate scenarios of fishing pressure [4] and [5]. The controversy regarding the changing composition of target catch remains active, however it is essential to understand the mechanism driving the witnessed change prior to implementing new management practices. This introduces two critical questions: (1) Are there differences in the ecological effects caused by differing scenarios of fishing pressure evolution? (2) see more Is there a possibility

that constant application of novel management approaches could yield differential results depending on the direction of changes in targeted catch? Trophic level is an indicator of an organism’s Selleckchem Androgen Receptor Antagonist location in the food web. Primary producers (i.e., organisms that create their own food), are assigned a value of one. Each step up the food web represents an increase of one trophic level. Scientists have proposed that the mean trophic level (MTL) of an ecosystem highlights important information about biodiversity and fishery sustainability [6] and [7]. High MTL indicates an abundance of high-level predators, which is inherently indicative of a large amount of prey, suggesting Terminal deoxynucleotidyl transferase higher biodiversity. Conversely, a lower MTL would indicate a low relative abundance of high-level predators compared to low-level prey, thus suggesting lower biodiversity. In their 1998 study, Pauly et al. used MTL to examine the target catch composition of fisheries worldwide. The authors examined global catch data for 220 species of fish and invertebrates

from 1950 to 1994. They found that “globally, trophic levels of fisheries landings appear to have declined in recent decades at a rate of about 0.1 per decade, without the landings themselves increasing substantially” [1]. This finding initiated global concern regarding trophodynamics, and caused scientists and policy makers alike to closely examine ecosystem structures and standard management policies. According to fisheries scientist and manager Michael King, “the purpose of fisheries management is to ensure that catches from a fish stock are ecologically sustainable in the long term and benefits to fishers and communities are maximized” [8]. The role of fisheries management is one of balance: sustainability of stocks must be congruent with the needs of society. Historically, the necessity for fisheries management has been overlooked; history is replete with accounts of the inexhaustible resource represented by fish.