. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. TOADFISH GILL AREAS AND STRUCTURE 151 base of a filament. The filaments of the posterior hemihranch are longer than the anterior filaments for the first and second arches, hut the anterior filaments are longer on the third arch ( Fig. 1 ). Total (/ill area and body wen/lit. The relationship between total gill area and body weight for 58 specimens that had been measured, is plotted on log/log coor- dinates in Figure 2. It is clear that the gill area increases with increasing si/.e. the regression line obeying the equation Log
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. TOADFISH GILL AREAS AND STRUCTURE 151 base of a filament. The filaments of the posterior hemihranch are longer than the anterior filaments for the first and second arches, hut the anterior filaments are longer on the third arch ( Fig. 1 ). Total (/ill area and body wen/lit. The relationship between total gill area and body weight for 58 specimens that had been measured, is plotted on log/log coor- dinates in Figure 2. It is clear that the gill area increases with increasing si/.e. the regression line obeying the equation Log A - 5(> + log (, A -- 5(> \Y"7:i) W Correspondingly the regression line for gill area/g against body weight has a slope of - A summary of the gill area data divided into 50 g classes is given in Table 1. The slope of the regression line relating these average areas to body weight is FILAMENT LENGTH mm. • ' •e * •' ' / <t I *. • K-& 1 FILAMENT NUMBER HK, 1. Graphs to show the length of filaments on the different gill arches of the left side of a toadfish (en. 400 g). Solid symbols indicate the lengths of filaments of the anterior hemibranches in each case. On average, every 5th filament was measured. Components j the (/ill area. When the measurements for gill area determina- tions are examined, it is clear that the increased area of larger fish is mainly due to a greater total number of secondary lamellae (Fig. 3 C). The number of gill filaments increases rapidly at body weights up to 50 g, but above that size there is relatively little increase in the total number of filaments (X ). Filament length increases continuously and consequently the number of secondary lamellae (Fig. 3 ). This is apparent when the data are plotted on log/log coordinates showing that the regression line for an increase in number of secondary lamellae has a slope of whereas that for filament number increases as W"-OST. Another important fa
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
