The results of the present study demonstrate that although 
the fish fauna in the Hallandale area is rich, the dusky jawfish 
may have been affected adversely by dredging activities and later 
by beach erosion. The first reef appears to have been affected 
directly by deposition of sediment that further reduced the bottom 
relief and grain size of the substrate. 
The dusky jawfish, a shallow-water burrowing species, has 
been used as an indicator species in studies of the effects of 
beach nourishment projects (Courtenay, et al., 1974). Thompson 
(1974) showed that this species typically burrows in sand areas at 
the edge of a vertical surface, usually of rock or dead coral, and 
never on a level surface. There these fishes excavate permanent 
burrows on the reef platform which they abandon only under condi- 
tions of considerable stress. In the previous study (Courtenay, 
et al., 1974), dusky jawfish were common on the first reef. This 
species was not observed during this study. The absence of this 
species probably can be attributed to an alteration of the 
substrate and habitat possibly due to deposition of fill materials. 
The fine-grained sediment is unstable for burrowing. Deposition on 
the first reef also reduced the available vertical surfaces. During 
1971-72, the first reef received only negligible damage from erosion 
of the filled beach. The present study indicates that the movement 
of fines covered the lower profile portions of the first reef. 
Certain species such as the belted cardinalfish (Apogon 
townsendt) and the roughhead blenny (Acanthemblemarta aspera) , 
collected at Hallandale in 1971-72 (Courtenay, et al., 1974), were 
not observed in this study. Courtenay, et al. (1974) predicted a 
decline of fishes and other marine animals on the first reef should 
further beach erosion occur. 
The second reef, located farther offshore, showed no effects 
of the 1971 beach restoration project or erosion and incursion of 
sediment. Previous damage (scouring, siltation, etc.) which had 
occurred as direct effects of dredging was not evident. Corals were 
abundant and thriving and the reef structure supported a rich fish 
fauna. Certain fish species such as the bridled goby, the rock beauty 
(Holacanthus tricolor), and the barred hamlet (Aypoplectrus puella), 
absent or listed as rare by Courtenay, et al. (1974), were abundant 
in this survey. The presence of these fishes in numbers of individ- 
uals is attributed to improved conditions following cessation of 
dredging activities. 
In summary, the fish fauna of the second reef off Hallandale 
shows no damage as a result of the dredging activities of 1971. 
The first reef, however, has been affected adversely by incursion of 
sediment. 
VI. RECOMMENDATIONS 
The recommendations of Courtenay, et al. (1974) are 
repeated. Before, during, and after beach restoration projects, 
"surveys should be conducted by both competent biologists and 
engineering surveyors..." 
IS) 
